Cracking interviews

Index

1. GitHub Resources for Coding Interviews
2. DSA & Coding Interview Problems with Links
3. 60 Easy questions
4. 80 Easy questions
5. 40 Easy questions
6. books
7. websites
8. studey guide

Top GitHub Repos for Coding Interviews

Repo Name	Description	Language	Stars / Notes	Link
jwasham/coding-interview-university	A detailed study plan with articles, videos, and resources to prepare for interviews at top companies like Google and Amazon. Covers DSA fundamentals to advanced topics.	Multiple	300k+	Link
TheAlgorithms/Python	Open-source implementations of hundreds of algorithms and data structures in Python, with explanations—ideal for hands-on learning and interview practice.	Python	180k+	Link
yangshun/tech-interview-handbook	Curated guide for all interview phases, including DSA cheat sheets, behavioral tips, and coding challenges in multiple languages.	Multiple	100k+	Link
ashishps1/awesome-leetcode-resources	Awesome curated list of LeetCode resources, including problem lists, solutions, and DSA learning paths for coding interviews.	N/A (Curated)	10k+	Link
AkashSingh3031/The-Complete-FAANG-Preparation	All-in-one repo for FAANG interviews: 450+ DSA problems (Love Babbar sheet), theory on OS/DBMS, puzzles, and MCQs.	Multiple	15k+	Link
seanprashad/leetcode-patterns	Pattern-based approach to LeetCode problems (150+), grouping by techniques like sliding window and DP for efficient interview prep.	Multiple	40k+	Link
kunal-kushwaha/DSA-Bootcamp-Java	Complete DSA bootcamp with code samples, assignments, and notes—structured for Java learners prepping for placements.	Java	10k+	Link
careercup/CtCI-6th-Edition	Solutions and challenges from "Cracking the Coding Interview" book, covering 189 essential problems for tech interviews.	Multiple	10k+	Link
MisterBooo/LeetCodeAnimation	Animated visualizations and solutions for 200+ LeetCode problems, making complex DSA concepts easier to grasp.	Multiple	60k+	Link
twowaits/SDE-Interview-Questions	Comprehensive scraped list of SDE interview questions from GeeksforGeeks, Glassdoor, etc., with DSA focus.	N/A (Curated)	10k+	Link
anushka23g/Complete-Placement-Preparation	Materials for cracking coding rounds: DSA problems, interview questions, and company-wise prep.	Multiple	5k+	Link
fishercoder1534/Leetcode	Daily-updated solutions to thousands of LeetCode problems, categorized by DSA topics.	Java	20k+	Link
teivah/algodeck	200+ algorithmic flash cards for quick DSA review and interview flashcards.	N/A (Cards)	10k+	Link
donnemartin/interactive-coding-challenges	Interactive Python challenges with visualizations for practicing DSA like a whiteboard interview.	Python	30k+	Link
ChunhThanhDe/Leetcode-Top-Interview	Solutions to LeetCode's Top 150 Interview Questions, covering core DSA patterns.	Multiple	5k+	Link
vineethm1627/SDE_Sheet_Striver	Complete C++ solutions for all 180 problems, organized by 30-day challenge. Includes code and explanations.	C++	N/A	Link
muditmahajan21/striver-sde-sheet	Detailed problem-wise solutions with notes on approaches. Great for understanding patterns.	Multiple	N/A	Link
arindal1/StriversDSASheet	Solutions to Striver's A2Z DSA Sheet problems, with a focus on collaborative learning and video-linked explanations.	Multiple	N/A	Link
chetan6780/Striver-SDE-Sheet	Curated list of problems with starter code and solutions for linked lists, arrays, and more.	Multiple	N/A	Link
sachuverma/DataStructures-Algorithms (Striver Section)	Repo with theory, resources, and Striver Sheet questions/solutions in one place. Includes interview prep links.	Multiple	N/A	Link

Interview Practice Questions: 180 DSA Problems

Overview

This document contains a curated list of 180 frequently asked coding interview problems from LeetCode, GeeksforGeeks (GFG), and Codeforces. The problems are categorized by difficulty:

• 60 Easy: Basic concepts like traversal, searching, and simple manipulations.
• 80 Medium: Optimization, two-pointers, recursion, and basic dynamic programming.
• 40 Hard: Advanced topics like graph algorithms, advanced DP, and bit manipulation.

Practice in topic order for better retention. Each problem includes the title, source, and direct link.

Easy Questions (60)

#	Title	Source	Link
1	Print the pattern	GFG	https://www.geeksforgeeks.org/problems/print-the-pattern-set-1/1
2	Print table	GFG	https://www.geeksforgeeks.org/problems/print-table0303/1
3	Series AP	GFG	https://www.geeksforgeeks.org/problems/series-ap5310/1
4	Series GP	GFG	https://www.geeksforgeeks.org/problems/series-gp4646/1
5	Closest Number	GFG	https://www.geeksforgeeks.org/problems/closest-number5728/1
6	Armstrong Numbers	GFG	https://www.geeksforgeeks.org/problems/armstrong-numbers2727/1
7	Sum of digits of a number	GFG	https://www.geeksforgeeks.org/problems/sum-of-digits1742/1
8	Reverse digits	GFG	https://www.geeksforgeeks.org/problems/reverse-digit0316/1
9	Print the Kth Digit	GFG	https://www.geeksforgeeks.org/problems/print-the-kth-digit3520/1
10	Binary number to decimal number	GFG	https://www.geeksforgeeks.org/problems/binary-number-to-decimal-number3525/1
11	Jumping Numbers	GFG	https://www.geeksforgeeks.org/problems/jumping-numbers3805/1
12	GCD of two numbers	GFG	https://www.geeksforgeeks.org/problems/gcd-of-two-numbers3459/1
13	LCM of two numbers	GFG	https://www.geeksforgeeks.org/problems/lcm-and-gcd4516/1
14	Add two fractions	GFG	https://www.geeksforgeeks.org/problems/add-two-fractions/1
15	GCD of array	GFG	https://www.geeksforgeeks.org/problems/gcd-of-array0614/1
16	Factorial of a number	GFG	https://www.geeksforgeeks.org/problems/factorial5739/1
17	Compute nPr	GFG	https://www.geeksforgeeks.org/problems/npr4253/1
18	Compute nCr	GFG	https://www.geeksforgeeks.org/problems/ncr1019/1
19	Largest prime factor	GFG	https://www.geeksforgeeks.org/problems/largest-prime-factor2601/1
20	Perfect Numbers	GFG	https://www.geeksforgeeks.org/problems/perfect-numbers3207/1
21	Young Physicist	Codeforces	http://codeforces.com/problemset/problem/69/A
22	Beautiful Matrix	Codeforces	http://codeforces.com/problemset/problem/263/A
23	Queue at the School	Codeforces	http://codeforces.com/problemset/problem/266/B
24	Borze	Codeforces	http://codeforces.com/problemset/problem/32/B
25	Beautiful Year	Codeforces	http://codeforces.com/problemset/problem/271/A
26	Lights Out	Codeforces	http://codeforces.com/problemset/problem/275/A
27	Word	Codeforces	http://codeforces.com/problemset/problem/59/A
28	Word Capitalization	Codeforces	http://codeforces.com/problemset/problem/281/A
29	Nearly Lucky Number	Codeforces	http://codeforces.com/problemset/problem/110/A
30	Stones on the Table	Codeforces	http://codeforces.com/problemset/problem/266/A
31	Two Sum	LeetCode	https://leetcode.com/problems/two-sum/
32	Valid Parentheses	LeetCode	https://leetcode.com/problems/valid-parentheses/
33	Same Tree	LeetCode	https://leetcode.com/problems/same-tree/
34	Symmetric Tree	LeetCode	https://leetcode.com/problems/symmetric-tree/
35	Maximum Depth of Binary Tree	LeetCode	https://leetcode.com/problems/maximum-depth-of-binary-tree/
36	Counting Bits	LeetCode	https://leetcode.com/problems/counting-bits/
37	Reverse Bits	LeetCode	https://leetcode.com/problems/reverse-bits/
38	Palindrome Number	LeetCode	https://leetcode.com/problems/palindrome-number/
39	Roman to Integer	LeetCode	https://leetcode.com/problems/roman-to-integer/
40	Longest Common Prefix	LeetCode	https://leetcode.com/problems/longest-common-prefix/
41	Panoramix's Prediction	Codeforces	http://codeforces.com/problemset/problem/80/A
42	Ultra-Fast Mathematician	Codeforces	http://codeforces.com/problemset/problem/61/A
43	Perfect Permutation	Codeforces	http://codeforces.com/problemset/problem/233/A
44	Arrival of the General	Codeforces	http://codeforces.com/problemset/problem/144/A
45	Drinks	Codeforces	http://codeforces.com/problemset/problem/200/B
46	Insomnia cure	Codeforces	http://codeforces.com/problemset/problem/148/A
47	Cupboards	Codeforces	http://codeforces.com/problemset/problem/248/A
48	I_love_%username%	Codeforces	http://codeforces.com/problemset/problem/155/A
49	Tram	Codeforces	http://codeforces.com/problemset/problem/116/A
50	Helpful Maths	Codeforces	http://codeforces.com/problemset/problem/339/A
51	Check for palindrome	GFG	https://www.geeksforgeeks.org/problems/palindrome-string0817/1
52	Check for anagram	GFG	https://www.geeksforgeeks.org/problems/anagram-1587115620/1
53	Anagram Palindrome	GFG	https://www.geeksforgeeks.org/problems/anagram-palindrome4720/1
54	Title case conversion	GFG	https://www.geeksforgeeks.org/problems/upper-case-conversion5419/1
55	Sort the string	GFG	https://www.geeksforgeeks.org/problems/sort-the-string-in-descending-order3542/1
56	Merge two strings	GFG	https://www.geeksforgeeks.org/problems/merge-two-strings2736/1
57	Save Ironman	GFG	https://www.geeksforgeeks.org/problems/save-ironman/0
58	Good or Bad string	GFG	https://www.geeksforgeeks.org/problems/good-or-bad-string1417/1
59	Extract Maximum	GFG	https://www.geeksforgeeks.org/problems/extract-maximum2943/1
60	Reverse words in a given string	GFG	https://www.geeksforgeeks.org/problems/reverse-words-in-a-given-string5459/1

Medium Questions (80)

#	Title	Source	Link
1	Linear Search	GFG	https://www.geeksforgeeks.org/problems/searching-a-number0324/1
2	Facing the sun	GFG	https://www.geeksforgeeks.org/problems/buildings-receiving-sunlight3032/1
3	Magnet Array Problem	GFG	https://www.geeksforgeeks.org/problems/magnet-array-problem3743/1
4	Binary Search	GFG	https://www.geeksforgeeks.org/problems/binary-search-1587115620/1
5	Floor in a Sorted Array	GFG	https://www.geeksforgeeks.org/problems/floor-in-a-sorted-array-1587115620/1
6	Count occurrences in a sorted array	GFG	https://www.geeksforgeeks.org/problems/number-of-occurrence2259/1
7	Search in a sorted and rotated	GFG	https://www.geeksforgeeks.org/problems/search-in-a-rotated-array4618/1
8	Find the missing number	GFG	https://www.geeksforgeeks.org/problems/missing-number/0
9	Missing element of AP	GFG	https://www.geeksforgeeks.org/problems/missing-element-of-ap2228/1
10	Square root of a number	GFG	https://www.geeksforgeeks.org/problems/square-root/1
11	Check if array is sorted	GFG	https://www.geeksforgeeks.org/problems/check-if-an-array-is-sorted0701/1
12	Sort a binary array	GFG	https://www.geeksforgeeks.org/problems/binary-array-sorting-1587115620/1
13	Sort an array of 0s, 1s and 2s	GFG	https://www.geeksforgeeks.org/problems/sort-an-array-of-0s-1s-and-2s4231/1
14	Bubble Sort	GFG	https://www.geeksforgeeks.org/problems/bubble-sort/1
15	Insertion Sort	GFG	https://www.geeksforgeeks.org/problems/insertion-sort/1
16	Selection Sort	GFG	https://www.geeksforgeeks.org/problems/selection-sort/1
17	Quick Sort	GFG	https://www.geeksforgeeks.org/problems/quick-sort/1
18	Merge Sort	GFG	https://www.geeksforgeeks.org/problems/merge-sort/1
19	Sort an array when two halves are sorted	GFG	https://www.geeksforgeeks.org/problems/sort-the-half-sorted2157/1
20	Relative Sorting	GFG	https://www.geeksforgeeks.org/problems/relative-sorting4323/1
21	Print a Linked List	GFG	https://www.geeksforgeeks.org/problems/print-linked-list-elements/1
22	Length of a linked list	GFG	https://www.geeksforgeeks.org/problems/count-nodes-of-linked-list/1
23	Node at a given index in linked list	GFG	https://www.geeksforgeeks.org/problems/node-at-a-given-index-in-linked-list/1
24	Middle of a linked list	GFG	https://www.geeksforgeeks.org/problems/finding-middle-element-in-a-linked-list/1
25	n-th node from end of a linked list	GFG	https://www.geeksforgeeks.org/problems/nth-node-from-end-of-linked-list/1
26	Delete a node	GFG	https://www.geeksforgeeks.org/problems/delete-a-node-in-single-linked-list/1
27	Remove every k'th node	GFG	https://www.geeksforgeeks.org/problems/remove-every-kth-node/1
28	Delete N nodes after M nodes of a linked list	GFG	https://www.geeksforgeeks.org/problems/delete-n-nodes-after-m-nodes-of-a-linked-list/1
29	Delete without head pointer	GFG	https://www.geeksforgeeks.org/problems/delete-without-head-pointer/1
30	Rearrange a linked list	GFG	https://www.geeksforgeeks.org/problems/rearrange-a-linked-list/1
31	Implement Stack using Array	GFG	https://www.geeksforgeeks.org/problems/implement-stack-using-array/1
32	Implement Stack using Linked List	GFG	https://www.geeksforgeeks.org/problems/implement-stack-using-linked-list/1
33	Check for balanced parenthesis	GFG	https://www.geeksforgeeks.org/problems/parenthesis-checker2744/1
34	Reverse a stack	GFG	https://www.geeksforgeeks.org/problems/reverse-a-string-using-stack/1
35	Implement two stacks in an array	GFG	https://www.geeksforgeeks.org/problems/implement-two-stacks-in-an-array/1
36	Design a stack with getMin	GFG	https://www.geeksforgeeks.org/problems/special-stack/1
37	The celebrity problem	GFG	https://www.geeksforgeeks.org/problems/the-celebrity-problem/1
38	Stock Span Problem	GFG	https://www.geeksforgeeks.org/problems/stock-span-problem-1587115621/1
39	Next Greater Element	GFG	https://www.geeksforgeeks.org/problems/next-larger-element-1587115620/1
40	Next Smaller Element	GFG	https://www.geeksforgeeks.org/problems/immediate-smaller-element1142/1
41	Longest valid Parentheses	GFG	https://www.geeksforgeeks.org/problems/longest-valid-parentheses5657/1
42	Implement Queue using Linked List	GFG	https://www.geeksforgeeks.org/problems/implement-queue-using-linked-list/1
43	Implement Queue using Array	GFG	https://www.geeksforgeeks.org/problems/implement-queue-using-array/1
44	Implement Stack using Queue	GFG	https://www.geeksforgeeks.org/problems/stack-using-two-queues/1
45	Implement Queue using Stack	GFG	https://www.geeksforgeeks.org/problems/queue-using-two-stacks/1
46	Reversing a Queue	GFG	https://www.geeksforgeeks.org/problems/reverse-first-k-elements-of-queue/1
47	Circular tour	GFG	https://www.geeksforgeeks.org/problems/circular-tour-1587115620/1
48	First non-repeating character in a stream	GFG	https://www.geeksforgeeks.org/problems/first-non-repeating-character-in-a-stream1216/1
49	Longest Substring Without Repeating Characters	LeetCode	https://leetcode.com/problems/longest-substring-without-repeating-characters/
50	Container With Most Water	LeetCode	https://leetcode.com/problems/container-with-most-water/
51	3Sum	LeetCode	https://leetcode.com/problems/3sum/
52	Remove Nth Node From End of List	LeetCode	https://leetcode.com/problems/remove-nth-node-from-end-of-list/
53	Add Two Numbers	LeetCode	https://leetcode.com/problems/add-two-numbers/
54	Longest Palindromic Substring	LeetCode	https://leetcode.com/problems/longest-palindromic-substring/
55	Zigzag Level Order Traversal	LeetCode	https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/
56	Clone Graph	LeetCode	https://leetcode.com/problems/clone-graph/
57	Sum of Two Integers	LeetCode	https://leetcode.com/problems/sum-of-two-integers/
58	Unique Paths	LeetCode	https://leetcode.com/problems/unique-paths/
59	House Robber	LeetCode	https://leetcode.com/problems/house-robber/
60	Paint Fence	LeetCode	https://leetcode.com/problems/paint-fence/
61	Longest Increasing Subsequence	LeetCode	https://leetcode.com/problems/longest-increasing-subsequence/
62	Maximum Subarray	LeetCode	https://leetcode.com/problems/maximum-subarray/
63	Unique Paths II	LeetCode	https://leetcode.com/problems/unique-paths-ii/
64	House Robber II	LeetCode	https://leetcode.com/problems/house-robber-ii/
65	Triplet Sum in Array	GFG	https://www.geeksforgeeks.org/problems/triplet-sum-in-array-1587115621/1
66	Minimum Swaps to Sort	GFG	https://www.geeksforgeeks.org/problems/minimum-swaps/1
67	Sorting elements by frequency	GFG	https://www.geeksforgeeks.org/problems/sorting-elements-of-an-array-by-frequency/0
68	Triplet Family	GFG	https://www.geeksforgeeks.org/problems/triplet-family/1
69	Count the triplets	GFG	https://www.geeksforgeeks.org/problems/count-the-triplets4615/1
70	Segregate even and odd	GFG	https://www.geeksforgeeks.org/problems/segregate-even-and-odd-nodes-in-a-linked-list5035/1
71	Reorder List	GFG	https://www.geeksforgeeks.org/problems/reorder-list/1
72	Polynomial Addition	GFG	https://www.geeksforgeeks.org/problems/polynomial-addition/1
73	Insert in a Sorted List	GFG	https://www.geeksforgeeks.org/problems/insert-in-a-sorted-list/1
74	Swap nodes in pairs	GFG	https://www.geeksforgeeks.org/problems/pairwise-swap-elements-of-a-linked-list-by-swapping-data/1
75	Reverse a linked list	GFG	https://www.geeksforgeeks.org/problems/reverse-a-linked-list/1
76	Reverse a Linked List in groups of given size	GFG	https://www.geeksforgeeks.org/problems/reverse-a-linked-list-in-groups-of-given-size/1
77	Check for palindrome	GFG	https://www.geeksforgeeks.org/problems/check-if-linked-list-is-pallindrome/1
78	Flattening a linked list	GFG	https://www.geeksforgeeks.org/problems/flattening-a-linked-list/1
79	Get intersection point	GFG	https://www.geeksforgeeks.org/problems/intersection-point-in-y-shapped-linked-lists/1
80	Remove duplicates from sorted list	GFG	https://www.geeksforgeeks.org/problems/remove-duplicate-element-from-sorted-linked-list/1

Hard Questions (40)

#	Title	Source	Link
1	Inorder Traversal	GFG	https://www.geeksforgeeks.org/problems/inorder-traversal/1
2	Preorder Traversal	GFG	https://www.geeksforgeeks.org/problems/preorder-traversal/1
3	Postorder Traversal	GFG	https://www.geeksforgeeks.org/problems/postorder-traversal/1
4	Level order traversal	GFG	https://www.geeksforgeeks.org/problems/level-order-traversal/1
5	Find height of Binary Tree	GFG	https://www.geeksforgeeks.org/problems/height-of-binary-tree/1
6	Count Leaves in Binary Tree	GFG	https://www.geeksforgeeks.org/problems/count-leaves-in-binary-tree/1
7	Check for Children Sum Property	GFG	https://www.geeksforgeeks.org/problems/children-sum-parent/1
8	Mirror Tree	GFG	https://www.geeksforgeeks.org/problems/mirror-tree/1
9	Check for Balanced Tree	GFG	https://www.geeksforgeeks.org/problems/check-for-balanced-tree/1
10	Lowest Common Ancestor in a Binary Tree	GFG	https://www.geeksforgeeks.org/problems/lowest-common-ancestor-in-a-binary-tree/1
11	Diameter of Binary Tree	GFG	https://www.geeksforgeeks.org/problems/diameter-of-binary-tree/1
12	Left View of Binary Tree	GFG	https://www.geeksforgeeks.org/problems/left-view-of-binary-tree/1
13	Right View of Binary Tree	GFG	https://www.geeksforgeeks.org/problems/right-view-of-binary-tree/1
14	Maximum path sum	GFG	https://www.geeksforgeeks.org/problems/maximum-path-sum/1
15	Level order traversal line by line	GFG	https://www.geeksforgeeks.org/problems/level-order-traversal-line-by-line/1
16	Tree from Postorder and Inorder	GFG	https://www.geeksforgeeks.org/problems/tree-from-postorder-and-inorder/1
17	Tree from Preorder and Inorder	GFG	https://www.geeksforgeeks.org/problems/construct-tree-1/1
18	Connect Nodes at Same Level	GFG	https://www.geeksforgeeks.org/problems/connect-nodes-at-same-level/1
19	Zig-Zag level order traversal	GFG	https://www.geeksforgeeks.org/problems/zigzag-tree-traversal/1
20	Serialize and Deserialize a Binary Tree	GFG	https://www.geeksforgeeks.org/problems/serialize-and-deserialize-a-binary-tree/1
21	Leaves to DLL	GFG	https://www.geeksforgeeks.org/problems/leaves-to-dll/1
22	Binary Tree to Doubly Linked List	GFG	https://www.geeksforgeeks.org/problems/binary-tree-to-dll/1
23	Binary Tree to Circular Doubly Linked List	GFG	https://www.geeksforgeeks.org/problems/binary-tree-to-cdll/1
24	Print adjacency list	GFG	https://www.geeksforgeeks.org/problems/print-adjacency-list-1587115620/1
25	Breadth First Search	GFG	https://www.geeksforgeeks.org/problems/bfs-traversal-of-graph/1
26	Depth First Search	GFG	https://www.geeksforgeeks.org/problems/depth-first-traversal-for-a-graph/1
27	Find whether path exist	GFG	https://www.geeksforgeeks.org/problems/find-whether-path-exist5238/1
28	Knight Walk	GFG	https://www.geeksforgeeks.org/problems/knight-walk4521/1
29	Snake and Ladder Problem	GFG	https://www.geeksforgeeks.org/problems/snake-and-ladder-problem4816/1
30	Bipartite Graph	GFG	https://www.geeksforgeeks.org/problems/bipartite-graph/1
31	Detect Cycle in an undirected graph	GFG	https://www.geeksforgeeks.org/problems/detect-cycle-in-an-undirected-graph/1
32	Detect Cycle in a directed graph	GFG	https://www.geeksforgeeks.org/problems/detect-cycle-in-a-directed-graph/1
33	Rotten oranges	GFG	https://www.geeksforgeeks.org/problems/rotten-oranges2536/1
34	Word Ladder	LeetCode	https://leetcode.com/problems/word-ladder/
35	Median of Two Sorted Arrays	LeetCode	https://leetcode.com/problems/median-of-two-sorted-arrays/
36	Merge k Sorted Lists	LeetCode	https://leetcode.com/problems/merge-k-sorted-lists/
37	Regular Expression Matching	LeetCode	https://leetcode.com/problems/regular-expression-matching/
38	Longest Valid Parentheses	LeetCode	https://leetcode.com/problems/longest-valid-parentheses/
39	N-Queens	LeetCode	https://leetcode.com/problems/n-queens/
40	Wildcard Matching	LeetCode	https://leetcode.com/problems/wildcard-matching/

Study Guide: Key Concepts to Learn

Before solving these problems, master foundational concepts including time/space complexity (Big O notation) and topic-specific ideas (e.g., two-pointer technique for arrays, recursion for trees).

For a comprehensive guide:

• Download: Complete Data Structures and Algorithms Guide (PDF)

This PDF covers explanations, examples, and prerequisites for arrays, strings, linked lists, stacks/queues, trees, graphs, sorting/searching, DP, and more.

Books

• Introduction to Algorithms (CLRS): Deep dive into algorithms. Buy on Amazon
• Cracking the Coding Interview: 189 interview problems with solutions. Buy on Amazon
• Data Structures and Algorithms Made Easy: Practical puzzles. Free PDF

Websites

• LeetCode: 2000+ problems, mock interviews. leetcode.com
• GeeksforGeeks: Tutorials and practice. geeksforgeeks.org
• Codeforces: Competitive programming for speed. codeforces.com
• HackerRank: Domain-specific challenges. hackerrank.com

---

• last updated : 2 october 2025
• rsvn