Google Software Engineer Interview Preparation Guide - Junior Level (1-2 years)
Google's interview process for junior-level software engineers comprises a comprehensive 7-stage evaluation spanning 4-8 weeks. The process begins with a recruiter screen, progresses through an online coding assessment to filter for technical fundamentals, advances to a technical phone screen interview, and culminates in four on-site interview rounds. These on-site rounds consist of two technical coding interviews focusing on data structures and algorithms, one behavioral interview assessing cultural fit and collaboration skills, and one additional technical interview for comprehensive evaluation. Google's approach is structured yet deliberately challenging, designed to identify junior engineers with strong fundamentals, problem-solving ability, communication skills, and cultural alignment with Google values.
Interview Rounds
Recruiter Screening
What to Expect
Your initial contact with a Google recruiter who verifies your background, confirms your interest in the Software Engineer role, and assesses your work experience and educational qualifications. The recruiter discusses your previous projects, your motivation for joining Google, and preliminary alignment with junior-level expectations. This conversation outlines the complete interview process timeline and what to expect. The recruiter also answers your questions about the role, team structure, and engineering culture at Google.
Tips & Advice
Prepare a compelling 2-3 minute narrative of your relevant work experience or academic projects that demonstrates you understand software development fundamentals. Research Google's products and engineering challenges that excite you - reference specific examples. Be genuine and enthusiastic, showing you want to work at Google specifically, not just any tech company. Have thoughtful questions ready about role expectations, team composition, and what success looks like. Be honest about your experience level as a junior engineer and emphasize your eagerness to learn and grow. Listen carefully to the recruiter's description and confirm your availability for subsequent rounds. Maintain a professional, friendly tone throughout.
Focus Topics
Questions for the Recruiter
Prepare 3-4 thoughtful questions such as: What programming languages will I primarily use? What types of problems will the team be solving? How does the team approach code quality and testing? What's the onboarding process? What metrics matter most for this role? What's the typical career progression for a junior engineer? These questions show genuine interest and help you assess fit.
Practice Interview
Study Questions
Genuine Motivation for Google
Articulate specifically why Google appeals to you beyond generic reasons like 'it's a great company.' Reference specific products (Search, Cloud, Maps, Android), technical challenges Google faces, or engineering practices Google is known for. Show understanding of Google's engineering culture and mission.
Practice Interview
Study Questions
Specific Project Examples and Outcomes
Prepare 2-3 concrete project examples using the STAR method: Situation (what was the project/problem), Task (your specific responsibility), Action (what you did technically), Result (what was accomplished, quantified if possible). Include examples showing different aspects: completing a full software development cycle, debugging a complex issue, optimizing performance, or collaborating with teammates.
Practice Interview
Study Questions
Professional Background and Experience Summary
Develop a concise 2-3 minute narrative covering your relevant work experience, internships, academic projects, or personal projects that demonstrate software engineering competence. For each major project, articulate the problem you solved, technologies you used (Java, Python, C++, JavaScript, etc.), and measurable outcomes achieved. Highlight your growth trajectory and key technical decisions you made.
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Study Questions
Technical Skill Stack and Proficiency
Clearly communicate your proficiency in programming languages (Java, Python, C++, JavaScript, etc.), key frameworks you've used, databases you're familiar with, and tools in your engineering toolkit. Be honest about your proficiency level in each area - Google values transparency. Mention any specialized areas like web development, backend systems, or distributed computing.
Practice Interview
Study Questions
Online Coding Assessment
What to Expect
A remote, unsupervised coding assessment where you independently solve 2-3 coding problems within a specified time limit using Google Docs or HackerRank. Problems are LeetCode medium-difficulty, focusing on core data structures (arrays, linked lists, trees, graphs, hash tables) and algorithms (sorting, searching, dynamic programming fundamentals). You must complete all problems within the allotted time without external assistance or reference materials. This assessment tests your fundamental coding ability, problem-solving approach, time management under pressure, and ability to write clean, executable code without real-time feedback.
Tips & Advice
Before the assessment, practice extensively with 50+ LeetCode medium-difficulty problems in a plain text editor without autocomplete to replicate the real environment. Time yourself strictly to ensure you can solve medium problems within 40-45 minutes each. During the assessment, start by fully understanding the problem: read all constraints, clarify input/output format, and mentally identify edge cases. Briefly articulate your algorithm approach before coding - this prevents wasted time on wrong approaches. Write clean, readable code using meaningful variable names. Test your solution with provided examples and discuss edge cases mentally. Prioritize correctness over perfection; a solid working solution is better than an incomplete optimization. Aim to solve 2 of 3 problems completely. Partial solutions with correct logic may receive partial credit. Manage stress - remember this is testing fundamentals, not brilliance.
Focus Topics
Dynamic Programming Fundamentals
Recognize DP problems by identifying overlapping subproblems and optimal substructure. Solve classic DP problems: Fibonacci variations, climbing stairs, coin change, longest increasing subsequence, edit distance. Understand both memoization (top-down) and tabulation (bottom-up) approaches. Analyze DP solution complexity.
Practice Interview
Study Questions
Graph Traversal and Basic Graph Algorithms
Represent graphs as adjacency lists or matrices. Implement BFS and DFS traversals correctly. Solve problems involving connected components, paths between nodes, topological sorting basics, and cycle detection. Recognize problems that can be modeled as graphs.
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Study Questions
Hash Tables, Sets, and Counting Problems
Understand hash table implementation, collision handling, and performance characteristics. Solve problems involving finding duplicates, counting frequencies, checking for existence, and using hashing to optimize brute force solutions from O(n²) to O(n). Recognize when hashing is the right approach.
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Study Questions
Linked Lists and Basic Tree Operations
Understand singly and doubly linked lists: insertion, deletion, reversal, cycle detection. Master tree traversal methods (in-order, pre-order, post-order, level-order/BFS) and tree problems involving searching, manipulation, and path finding. Practice building trees from various representations and solving tree problems confidently.
Practice Interview
Study Questions
Array and String Manipulation
Master core array techniques: traversal, searching, sorting, two-pointer technique, sliding window, prefix sums, and in-place modifications. Solve array rearrangement problems, subarray problems, and string transformation problems. Understand time/space complexity trade-offs for different approaches. Practice pattern recognition for when to apply each technique.
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Study Questions
Clean Code and Problem Communication
Write clean, readable code: meaningful variable names, appropriate comments for complex logic, no magic numbers (use constants), modular structure. Optimize for readability without sacrificing performance. Verify code works mentally with test cases before submitting.
Practice Interview
Study Questions
Technical Phone Screen
What to Expect
A single 45-minute live technical interview conducted via Google Docs or CoderPad with a Google engineer. You'll solve 1-2 coding problems similar in difficulty to the online assessment, but with real-time interviewer interaction. The interviewer observes not just whether you reach the correct solution, but how you approach problems, communicate your thinking, respond to suggestions, and discuss trade-offs. The interviewer takes notes on problem comprehension, coding ability, communication clarity, and efficiency analysis. You receive a 'hire/no hire' recommendation based on whether you demonstrate solid fundamentals and thinking appropriate for junior level.
Tips & Advice
Start by carefully re-reading the problem and asking clarifying questions about constraints, edge cases, input ranges, and requirements. Don't assume you understand - confirm. Spend 5-10 minutes discussing your approach with the interviewer before writing code. Think aloud throughout - explain your reasoning, trade-offs, and algorithmic choices. Write code deliberately and neatly on the collaborative document. As you write, narrate what you're doing. Test your code with provided examples and at least one edge case mentally. If you get stuck, communicate your thinking and ask for hints rather than sitting silently. Be receptive to interviewer feedback and implement suggestions gracefully. Time management is critical - if approaching time limit, ensure you have a working solution rather than pursuing perfect optimization. A partial but correct solution is valued over incomplete perfection. Maintain calm, positive energy even if struggling. The interviewer is assessing your problem-solving process and communication, not just your final answer.
Focus Topics
Optimization and Complexity Analysis
Once you have a working solution, discuss optimizations. Identify bottlenecks. Propose improvements to time or space complexity. Analyze trade-offs between optimization approaches. Explain why the optimized version is better. Don't optimize prematurely, but discuss possibilities.
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Study Questions
Communication and Collaboration
Verbalize your thought process continuously. Explain your reasoning aloud. When interviewer asks questions, answer directly and thoughtfully. Don't be defensive about your code; be open to feedback. Ask for hints if genuinely stuck. Engage as a collaborative partner, not an isolated coder.
Practice Interview
Study Questions
Testing and Verification
After coding, systematically test your solution. Walk through the code with provided examples. Mentally trace execution with edge cases. Identify potential bugs. Discuss what could go wrong. Explain how your solution handles various scenarios. Show you think comprehensively about correctness.
Practice Interview
Study Questions
Problem Comprehension and Requirements Clarification
Before solving any problem, fully understand requirements: identify exact input/output format, understand all constraints (array size, value ranges), recognize edge cases (empty input, duplicates, negative numbers), and clarify ambiguous statements. Ask the interviewer questions to confirm your understanding. This prevents solving the wrong problem.
Practice Interview
Study Questions
Algorithm Design and Approach Discussion
Propose your approach before coding. Discuss multiple solutions if applicable (brute force vs optimized). Articulate trade-offs: time complexity, space complexity, readability, implementation difficulty. Explain why you're choosing one approach. Be open to interviewer suggestions and discuss how alternative approaches would change the solution.
Practice Interview
Study Questions
Implementation and Code Quality
Write clean, readable code using meaningful variable names. Handle edge cases explicitly (don't assume perfect input). Use consistent style and formatting. Add brief comments for non-obvious logic. Structure code modularly. Avoid code duplication. Be methodical and deliberate to minimize bugs.
Practice Interview
Study Questions
On-site Interview Round 1: Coding Interview
What to Expect
First of four on-site interview rounds (or remote equivalent) conducted with a Google engineer, lasting 45-60 minutes. This round mirrors the phone screen format: you'll solve 1-2 coding problems of medium difficulty with increasing challenge. The interviewer assesses technical fundamentals, coding ability, problem-solving approach, and how you handle real-time challenges. As a junior engineer, the focus is demonstrating solid core competencies in data structures, algorithms, and clean code practices. This is not about brilliant optimization but about showing reliable, consistent engineering thinking.
Tips & Advice
Replicate the phone screen success strategies with added energy from the in-person or video setting. Take your time reading the problem carefully - don't rush into code. Spend 5-10 minutes discussing your approach with the interviewer. Write code neatly and clearly on the provided whiteboard or laptop, keeping it organized. Narrate your code as you write it - explain what each section does. Test mentally with examples as you code. If you make mistakes, acknowledge them and debug methodically. Engage with the interviewer - ask clarifying questions, discuss ideas, show enthusiasm for problem-solving. Use the interviewer as a resource - they want to see you succeed. Manage time effectively: aim to have a working solution with 10-15 minutes left for discussion and minor optimizations. Remember that consistency across your two coding interviews matters more than perfection in either one. Show reliable, solid thinking.
Focus Topics
Recursion and Backtracking Problem-Solving
Understand recursive problem-solving: structure recursive calls correctly, identify and handle base cases, avoid infinite recursion. Learn backtracking patterns for problems like permutations, combinations, Sudoku solving, N-Queens. Practice until recursive solutions feel natural.
Practice Interview
Study Questions
Two-Pointer and Sliding Window Patterns
Master these common efficient patterns for array problems. Two-pointer solves problems with pairs, comparisons, or convergence criteria. Sliding window handles contiguous subarrays and consecutive element operations. Recognize when to apply each and implement them correctly.
Practice Interview
Study Questions
String Processing and Pattern Manipulation
Work comfortably with string problems including substring operations, character counting, pattern matching, string transformations, and palindrome detection. Understand basic string algorithms. Manage edge cases in string manipulation carefully.
Practice Interview
Study Questions
Core Data Structures Mastery
Deep understanding of arrays, strings, linked lists, stacks, queues, trees (BST, balanced trees), heaps, graphs, and hash tables. Know when to use each structure and their performance characteristics (time for operations, space usage). Be able to implement and manipulate these structures in code efficiently.
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Study Questions
Algorithm Implementation from Scratch
Ability to implement common algorithms correctly: binary search, sorting algorithms (quicksort, mergesort), traversals (BFS, DFS), and dynamic programming basics. Write these implementations from memory without referencing solutions. Understand their correctness and complexity.
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Study Questions
On-site Interview Round 2: Coding Interview
What to Expect
Second coding round on-site or remote (45-60 minutes) with a different Google engineer. Format identical to Round 1: solve 1-2 medium-difficulty coding problems demonstrating technical skills, problem-solving methodology, and communication. This round is independent - a completely new problem and new interviewer. This second evaluation provides Google multiple data points on your coding ability across different problems and evaluators. For junior engineers, consistent solid performance across both coding rounds is critical to demonstrate reliable engineering fundamentals.
Tips & Advice
Bring the same energy and systematic approach as Round 1. Don't predict problem type - it could be entirely different. Apply the same rigorous process: understand deeply, discuss approach, code carefully, test thoroughly, discuss optimizations. If Round 1 went well, maintain confidence and focus. If Round 1 was challenging, apply lessons learned and approach Round 2 fresh. Consistency matters greatly - two interviewers seeing you handle different problems solidly is stronger than one struggling and one succeeding. Show enthusiasm and genuine interest in problem-solving both times. You may feel fatigue from the on-site day; manage energy and stay alert. Remember both interviewers' feedback influences the hiring committee. Be fresh, engaged, and demonstrate the same reliable thinking that impressed Round 1's interviewer.
Focus Topics
Dynamic Programming Problem Recognition
Identify problems exhibiting overlapping subproblems and optimal substructure. Solve classic DP problems: Fibonacci, climbing stairs, coin change, longest subsequences. Distinguish between problems requiring DP vs greedy vs other approaches. Understand memoization and tabulation.
Practice Interview
Study Questions
Heap and Priority Queue Problems
Understand heap data structure (min-heap, max-heap), heap operations (heapify, insert, delete), and performance characteristics. Solve problems involving finding top-k elements, merging sorted lists, or computing medians using heaps. Recognize when heaps optimize brute force.
Practice Interview
Study Questions
Sorting and Binary Search
Understand different sorting algorithms: bubble sort, selection sort, insertion sort, merge sort, quick sort. Know their complexities, when each applies, and implementation details. Implement binary search correctly including all edge cases. Recognize when to apply binary search patterns.
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Study Questions
Graph Problems and Traversal Algorithms
Understand graph representations (adjacency list, matrix). Implement BFS and DFS traversals correctly. Solve problems involving connectivity, finding paths, detecting cycles, identifying components, and topological sorting. Recognize problems solvable through graph modeling. Handle disconnected graphs and edge cases properly.
Practice Interview
Study Questions
Tree Traversal and Tree Problems
Master all tree traversal methods: in-order, pre-order, post-order, level-order. Solve tree problems involving path finding, lowest common ancestor, tree construction, tree validation, and tree manipulation. Understand binary search trees and when balanced trees matter.
Practice Interview
Study Questions
On-site Interview Round 3: Behavioral and Cultural Fit Interview
What to Expect
A 45-minute interview with a Google engineer (often from a different team than your potential assignment) assessing behavioral competencies, communication skills, teamwork abilities, and cultural fit with Google values. The interviewer explores your past experiences through structured behavioral questions using the STAR method. Topics include how you've handled conflicts, learned from failures, worked effectively in teams, contributed beyond your job description, and demonstrated initiative. This round is crucial because Google values not just technical skills but also your ability to collaborate, adapt to ambiguity, and thrive in Google's engineering culture - what Google calls 'Googleyness'.
Tips & Advice
Prepare 5-7 specific stories from work or academic projects demonstrating different competencies: teamwork and collaboration, learning from failure, handling conflict, taking initiative, dealing with ambiguity, delivering quality work, and handling feedback. For each story, use STAR method: Situation (context/challenge), Task (what needed to be done), Action (specific actions you took), Result (outcome achieved). Be specific with details and metrics when possible; avoid vague generalities. During the interview, listen carefully to the question and answer directly. Share authentic experiences, not fabricated stories - interviewers can detect insincerity. Emphasize growth mindset and your eagerness to learn as a junior engineer. Show genuine enthusiasm for Google's mission and products. Avoid speaking negatively about previous colleagues or managers - stay professional. Connect your experiences to Google values: being helpful, collaborating across teams, maintaining quality, and adapting to change.
Focus Topics
Quality and Attention to Detail
Share examples of ensuring code quality, testing thoroughly, catching bugs before deployment, or preventing problems through careful design. Show your quality standards and how you maintain them even under deadline pressure. Demonstrate care for outcomes and user impact.
Practice Interview
Study Questions
Handling Conflict and Receiving Feedback
Describe a specific situation where you had a disagreement with a colleague or received critical feedback. Explain how you handled it professionally, remained solution-focused, and learned from the experience. Show emotional maturity and growth mindset. Avoid defensive responses and emphasize collaborative resolution.
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Study Questions
Initiative and Ownership
Share examples of going beyond your job description, identifying problems and solving them proactively, or suggesting improvements to processes or code. Show you don't just do what's asked but actively think about adding value. Describe how you took ownership of quality and outcomes.
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Study Questions
Dealing with Ambiguity and Uncertainty
Describe situations where requirements were unclear, goals shifted, or you faced unexpected obstacles. Explain how you approached ambiguity: seeking clarification, breaking problems down, adapting your approach, and delivering results despite uncertainty. Show resilience and flexible problem-solving.
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Study Questions
Learning Ability and Adaptability
Share specific examples of learning new technologies, frameworks, or languages relevant to your engineering work. Describe how you adapted when faced with unexpected challenges or changing requirements. Show your growth trajectory from less experienced to more skilled. Demonstrate curiosity, self-directed learning, and comfort with stepping outside your comfort zone.
Practice Interview
Study Questions
Teamwork and Cross-functional Collaboration
Demonstrate ability to work effectively with diverse teammates from different backgrounds, skill levels, and perspectives. Share examples of successful collaboration across teams or disciplines. Show how you've supported teammates, contributed to team goals, and valued others' contributions. Highlight experiences working with senior engineers, junior colleagues, and non-technical team members.
Practice Interview
Study Questions
On-site Interview Round 4: Technical Problem-Solving and Thinking Interview
What to Expect
The fourth and final on-site round (45-60 minutes) with another Google engineer serves as comprehensive evaluation. For junior-level candidates, this round typically consists of either a harder coding problem requiring optimization or clever algorithmic thinking, or a junior-level system design/architecture discussion to assess broader technical thinking. The interviewer evaluates depth of technical knowledge, ability to handle more complex problems, and foundational understanding of how systems work. This round completes the hiring committee's picture by identifying any gaps and confirming the candidate's overall technical capability.
Tips & Advice
This round could be either a harder coding problem or a junior-level design discussion, so prepare for both. If it's coding, expect medium-hard difficulty - perhaps requiring optimization, handling large datasets, or combining multiple techniques. Use all techniques from previous rounds but push for more optimized solutions. Focus on correctness first, then optimization. If it's design-oriented, don't overthink - this is testing junior-level understanding, not architectural brilliance. Start with clarifying questions about scale and requirements. Propose reasonable solutions, discuss trade-offs honestly, and demonstrate you understand basic system design concepts: databases, caching, APIs, and scalability considerations. For junior level, the bar is understanding basic principles and thinking beyond single machines, not designing Netflix. Approach design problems as learning conversations. Admit gaps in knowledge - that's appropriate for junior level. If you get stuck in either format, ask questions and show your thinking rather than giving up. This round is less critical than the first two coding rounds for juniors but shows comprehensive technical capability.
Focus Topics
Trade-off Analysis and Engineering Judgment
Articulate trade-offs clearly: readability vs performance, simplicity vs features, immediate solution vs scalable solution, time to implement vs long-term maintainability. Make reasonable decisions and explain your reasoning. Show balanced, mature thinking.
Practice Interview
Study Questions
Junior-Level System Design Thinking
If design is tested, understand basic system components: databases (SQL vs NoSQL choice factors), caching layers (Redis), APIs (REST design), load balancing, and basic architectural patterns (client-server). Know basic principles without depth. Be able to discuss tradeoffs in simple system design coherently.
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Study Questions
API Design and Data Modeling Principles
Design clean APIs with clear contracts (inputs, outputs, error handling). Model data appropriately for problems. Consider versioning, extensibility, and usability in design. Think about how clients will interact with your interface.
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Study Questions
Advanced Algorithmic Problem-Solving
Solve problems combining multiple algorithmic techniques, requiring optimization, or handling multi-part challenges. Problems might involve combining sorting with searching, using hash maps for optimization, or sequencing multiple approaches. Demonstrate you can combine learned techniques creatively.
Practice Interview
Study Questions
Optimization for Scale and Performance
Understand optimizing for large datasets: millions of records, memory constraints, or high throughput. Think about space-time trade-offs and choose appropriate optimizations. Discuss strategies like caching, indexing, sampling, or parallel processing. Understand when optimizations matter.
Practice Interview
Study Questions
Frequently Asked Software Engineer Interview Questions
Sample Answer
def lcs_length_row(a, b):
# returns last DP row (lengths) for LCS between a and b
# ensures we iterate on shorter string for O(min(n,m)) space
if len(b) < len(a):
a, b = b, a
prev = [0] * (len(b) + 1)
for ch in a:
cur = [0]
for j, bj in enumerate(b, 1):
if ch == bj:
cur.append(prev[j-1] + 1)
else:
cur.append(max(prev[j], cur[-1]))
prev = cur
return prev
def hirschberg(a, b):
# returns LCS string
if not a or not b:
return ""
if len(a) == 1:
return a if a in b else ""
i = len(a) // 2
left_cost = lcs_length_row(a[:i], b)
right_cost = lcs_length_row(a[i:][::-1], b[::-1])
# find partition k maximizing left_cost[k] + right_cost[len(b)-k]
k = max(range(len(b)+1), key=lambda j: left_cost[j] + right_cost[len(b)-j])
return hirschberg(a[:i], b[:k]) + hirschberg(a[i:], b[k:])Sample Answer
Sample Answer
def two_sum(nums, target):
"""
Return indices (i,j) with nums[i]+nums[j]==target or None.
O(n) time, O(n) space.
"""
seen = {}
for i, x in enumerate(nums):
need = target - x
if need in seen:
return (seen[need], i)
seen[x] = i
return Nonedef three_sum(nums):
"""
Return list of unique triplets that sum to 0.
O(n^2) time, O(1) extra space (aside from output), after sorting O(n log n).
"""
nums.sort()
res = []
n = len(nums)
for i in range(n-2):
if i>0 and nums[i]==nums[i-1]:
continue
l, r = i+1, n-1
while l<r:
s = nums[i]+nums[l]+nums[r]
if s==0:
res.append([nums[i], nums[l], nums[r]])
l += 1; r -= 1
while l<r and nums[l]==nums[l-1]: l += 1
while l<r and nums[r]==nums[r+1]: r -= 1
elif s<0:
l += 1
else:
r -= 1
return resSample Answer
Sample Answer
Sample Answer
#include <bits/stdc++.h>
using namespace std;
struct Edge{int to; int rev; long long cap;};
struct Dinic {
int N;
vector<vector<Edge>> G;
vector<int> level, it;
Dinic(int n):N(n),G(n),level(n),it(n){}
void addEdge(int u,int v,long long c){
G[u].push_back({v,(int)G[v].size(),c});
G[v].push_back({u,(int)G[u].size()-1,0});
}
bool bfs(int s,int t){
fill(level.begin(), level.end(), -1);
queue<int>q; level[s]=0; q.push(s);
while(!q.empty()){
int u=q.front(); q.pop();
for(auto &e:G[u]) if(e.cap>0 && level[e.to]==-1){
level[e.to]=level[u]+1; q.push(e.to);
}
}
return level[t]!=-1;
}
long long dfs(int u,int t,long long f){
if(u==t) return f;
for(int &i=it[u]; i<(int)G[u].size(); ++i){
Edge &e = G[u][i];
if(e.cap>0 && level[e.to]==level[u]+1){
long long ret = dfs(e.to,t,min(f,e.cap));
if(ret>0){
e.cap -= ret;
G[e.to][e.rev].cap += ret;
return ret;
}
}
}
return 0;
}
long long maxflow(int s,int t){
long long flow=0;
while(bfs(s,t)){
fill(it.begin(), it.end(), 0);
while(true){
long long pushed = dfs(s,t,LLONG_MAX);
if(!pushed) break;
flow += pushed;
}
}
return flow;
}
};Sample Answer
from collections import defaultdict, deque
def ladderLength(beginWord, endWord, wordList):
if endWord not in wordList:
return 0
L = len(beginWord)
all_combo = defaultdict(list)
for word in wordList:
for i in range(L):
all_combo[word[:i] + '*' + word[i+1:]].append(word)
# Bidirectional BFS
def visit(queue, visited, other_visited):
current_word, level = queue.popleft()
for i in range(L):
pattern = current_word[:i] + '*' + current_word[i+1:]
for neighbor in all_combo.get(pattern, []):
if neighbor in other_visited:
return level + other_visited[neighbor]
if neighbor not in visited:
visited[neighbor] = level + 1
queue.append((neighbor, level + 1))
return None
q_begin = deque([(beginWord, 1)])
q_end = deque([(endWord, 1)])
visited_begin = {beginWord: 1}
visited_end = {endWord: 1}
while q_begin and q_end:
# expand smaller frontier for efficiency
ans = visit(q_begin, visited_begin, visited_end) if len(q_begin) <= len(q_end) else visit(q_end, visited_end, visited_begin)
if ans:
return ans
return 0Sample Answer
Sample Answer
from functools import lru_cache
def count_upto(X, s):
digits = list(map(int, str(X)))
n = len(digits)
@lru_cache(None)
def dfs(pos, tight, prev, sum_mod, leading_zero):
# pos: index in digits (0..n). If pos==n, check sum_mod==0 and not all leading zeros? treat 0 allowed if needed.
if pos == n:
return 1 if sum_mod % s == 0 and not (leading_zero and X!=0 and s!=1) else (1 if sum_mod % s == 0 else 0)
# simpler: allow 0 as valid if its sum_mod matches; adjust per problem spec.
limit = digits[pos] if tight else 9
total = 0
for d in range(0, limit+1):
ntight = tight and (d == limit)
nleading = leading_zero and (d == 0)
# if previous digit exists and both are non-leading zeros, forbid equal consecutive
if not nleading and not leading_zero:
if d == prev:
continue
# update sum only when not leading zeros or if you treat leading zeros as digits 0: here include d always
nsum = (sum_mod + d) % s
nprev = d if not nleading else -1
total += dfs(pos+1, ntight, nprev, nsum, nleading)
return total
# start: pos=0, tight=1, prev=-1, sum_mod=0, leading_zero=True
return dfs(0, True, -1, 0, True)
def count_range(A, B, s):
return count_upto(B, s) - (count_upto(A-1, s) if A>0 else 0)Sample Answer
Recommended Additional Resources
- LeetCode Premium - Solve 100+ medium-difficulty problems with Google tag filter; utilize weekly contests and curated problem lists
- HackerRank - Practice coding problems with Google-specific filters and real-time online judge feedback
- InterviewBit - Structured Google-specific interview preparation path with video explanations and community solutions
- GeeksforGeeks - Comprehensive tutorials on data structures, algorithms, and system design fundamentals
- Designing Data-Intensive Applications by Martin Kleppmann - Essential reading for understanding scalable system principles applicable to junior-level design questions
- The Algorithm Design Manual by Steven Skiena - Comprehensive algorithms reference with detailed explanations and complexity analysis
- Cracking the Coding Interview by Gayle Laakmann McDowell - Specifically focused on Big Tech interviews with actionable strategies and problem walkthroughs
- Google Cloud Skills Boost - Free courses covering Google technologies and cloud engineering fundamentals
- YouTube Channels - Back to Back SWE, NeetCode, Techlead - Visual walkthroughs of coding problem solutions and interview strategies
- Mock Interview Platforms - Pramp and Interviewing.io - Practice live interviews with real engineers in interview format
- Blind (website) - Anonymous community discussions about Google interview experiences, questions, and feedback from recent candidates
- Levels.fyi - Detailed salary and compensation information plus interview experiences from junior engineers at Google
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