git config core.hooksPath .githooks
chmod +x .githooks/pre-commitSee docs/dependency-updates.md for the review-file workflow, pin/skip rules, and Gradle wrapper update.
Problems solved in C++ live in cpp/ with their own CMake build — see cpp/README.md for the index and docs/cpp-track.md for setup.
- 1. Two Sum
- 2. Add Two Numbers
- 3. Longest Substring without Repeating Characters
- 4. Median of Two Sorted Arrays
- 5. Longest Palindromic Substring
- 6. Zigzag Conversion
- 9. Palindrome Number
- 11. Container with Most Water
- 12. Integer to Roman
- 13. Roman to Integer
- 14. Longest Common Prefix
- 15. 3Sum
- 17. Letter Combinations of a Phone Number
- 19. Remove Nth Node From End of List
- 20. Valid Parentheses
- 21. Merge Two Sorted Lists
- 22. Generate Parentheses
- 23. Merge k Sorted Lists
- 25. Reverse Nodes in k-Group
- 26. Remove Duplicates from Sorted Array
- 27. Remove Element
- 28. Find the Index of the First Occurrence in a String
- 30. Substring with Concatenation of All Words
- 33. Search in Rotated Sorted Array
- 34. Find First and Last Position of Element in Sorted Array
- 35. Search Insert Position
- 36. Valid Sudoku
- 39. Combination Sum
- 41. First Missing Positive
- 42. Trapping Rain Water
- 45. Jump Game II
- 46. Permutations
- 48. Rotate Image
- 49. Group Anagrams
- 50. Pow(x, n)
- 51. N-Queens
- 52. N-Queens II
- 53. Maximum Subarray
- 54. Spiral Matrix
- 55. Jump Game
- 56. Merge Intervals
- 57. Insert Interval
- 58. Length of Last Word
- 61. Rotate List
- 62. Unique Paths
- 63. Unique Paths II
- 64. Minimum Path Sum
- 66. Plus One
- 67. Add Binary
- 68. Text Justification
- 69. Sqrt(x)
- 70. Climbing Stairs
- 71. Simplify Path
- 72. Edit Distance
- 73. Set Matrix Zeroes
- 74. Search a 2D Matrix
- 76. Minimum Window Substring
- 77. Combinations
- 79. Word Search
- 80. Remove Duplicates from Sorted Array II
- 82. Remove Duplicates from Sorted List II
- 86. Partition List
- 88. Merge Sorted Array
- 91. Decode Ways
- 92. Reverse Linked List II
- 94. Binary Tree Inorder Traversal
- 98. Validate Binary Search Tree
- 100. Same Tree
- 101. Symmetric Tree
- 102. Binary Tree Level Order Traversal
- 103. Binary Tree Zigzag Level Order Traversal
- 104. Maximum Depth of Binary Tree
- 105. Construct Binary Tree from Preorder and Inorder Traversal
- 106. Construct Binary Tree from Inorder and Postorder Traversal
- 108. Convert Sorted Array to Binary Search Tree
- 110. Balanced Binary Tree
- 112. Path Sum
- 114. Flatten Binary Tree to Linked List
- 117. Populating Next Right Pointers in Each Node II
- 120. Triangle
- 121. Best Time to Buy and Sell Stock
- 122. Best Time to Buy and Sell Stock II
- 124. Binary Tree Maximum Path Sum
- 125. Valid Palindrome
- 127. Word Ladder
- 128. Longest Consecutive Sequence
- 129. Sum Root to Leaf Numbers
- 130. Surrounded Regions
- 133. Clone Graph
- 134. Gas Station
- 135. Candy
- 136. Single Number
- 137. Single Number II
- 138. Copy List with Random Pointer
- 139. Word Break
- 141. Linked List Cycle
- 143. Reorder List
- 146. LRU Cache
- 148. Sort List
- 149. Max Points on a Line
- 150. Evaluate Reverse Polish Notation
- 151. Reverse Words in a String
- 155. Min Stack
- 162. Find Peak Element
- 167. Two Sum II - Input Array Is Sorted
- 169. Majority Element
- 172. Factorial Trailing Zeroes
- 173. Binary Search Tree Iterator
- 189. Rotate Array
- 190. Reverse Bits
- 191. Number of 1 Bits
- 198. House Robber
- 199. Binary Tree Right Side View
- 200. Number of Islands
- 201. Bitwise AND of Numbers Range
- 202. Happy Number
- 205. Isomorphic Strings
- 206. Reverse Linked List
- 207. Course Schedule
- 208. Implement Trie (Prefix Tree)
- 209. Minimum Size Subarray Sum
- 210. Course Schedule II
- 211. Design Add and Search Words Data Structure
- 212. Word Search II
- 215. Kth Largest Element in an Array
- 217. Contains Duplicate
- 219. Contains Duplicate II
- 221. Maximal Square
- 222. Count Complete Tree Nodes
- 224. Basic Calculator
- 226. Invert Binary Tree
- 228. Summary Ranges
- 230. Kth Smallest Element in a BST
- 232. Implement Queue using Stacks
- 234. Palindrome Linked List
- 235. Lowest Common Ancestor of a Binary Search Tree
- 236. Lowest Common Ancestor of a Binary Tree
- 238. Product of Array Except Self
- 239. Sliding Window Maximum
- 242. Valid Anagram
- 252. Meeting Rooms
- 257. Binary Tree Paths
- 268. Missing Number
- 274. H-Index
- 278. First Bad Version
- 283. Move Zeroes
- 289. Game of Life
- 290. Word Pattern
- 295. Find Median from Data Stream
- 297. Serialize and Deserialize Binary Tree
- 300. Longest Increasing Subsequence
- 322. Coin Change
- 329. Longest Increasing Path in a Matrix
- 338. Counting Bits
- 344. Reverse String
- 347. Top K Frequent Elements
- 358. Rearrange String k Distance Apart
- 362. Design Hit Counter
- 373. Find K Pairs with Smallest Sums
- 380. Insert Delete GetRandom O(1)
- 383. Ransom Note
- 391. Perfect Rectangle
- 392. Is Subsequence
- 399. Evaluate Division
- 406. Queue Reconstruction by Height
- 409. Longest Palindrome
- 427. Construct Quad Tree
- 433. Minimum Genetic Mutation
- 435. Non-overlapping Intervals
- 443. String Compression
- 452. Minimum Number of Arrows to Burst Balloons
- 486. Predict the Winner
- 502. IPO
- 530. Minimum Absolute Difference in BST
- 543. Diameter of Binary Tree
- 547. Number of Provinces
- 561. Array Partition
- 572. Subtree of Another Tree
- 616. Add Bold Tag in String
- 628. Maximum Product of Three Numbers
- 637. Average of Levels in Binary Tree
- 647. Palindromic Substrings
- 652. Find Duplicate Subtrees
- 680. Valid Palindrome II
- 696. Count Binary Substrings
- 704. Binary Search
- 706. Design HashMap
- 733. Flood Fill
- 739. Daily Temperatures
- 819. Most Common Word
- 876. Middle of the Linked List
- 877. Stone Game
- 886. Possible Bipartition
- 909. Snakes and Ladders
- 918. Maximum Sum Circular Subarray
- 937. Reorder Data in Log Files
- 938. Range Sum of BST
- 994. Rotting Oranges
- 1081. Smallest Subsequence of Distinct Characters
- 1109. Corporate Flight Bookings
- 1140. Stone Game II
- 1143. Longest Common Subsequence
- 1146. Snapshot Array
- 1189. Maximum Number of Balloons
- 1249. Minimum Remove to Make Valid Parentheses
- 1260. Shift 2D Grid
- 1288. Remove Covered Intervals
- 1291. Sequential Digits
- 1297. Maximum Number of Occurrences of a Substring
- 1301. Number of Paths with Max Score
- 1331. Rank Transform of an Array
- 1344. Angle Between Hands of a Clock
- 1347. Minimum Number of Steps to Make Two Strings Anagram
- 1358. Number of Substrings Containing All Three Characters
- 1391. Check If There is a Valid Path in a Grid
- 1406. Stone Game III
- 1424. Diagonal Traverse II
- 1464. Maximum Product of Two Elements in an Array
- 1481. Least Number of Unique Integers after K Removals
- 1510. Stone Game IV
- 1593. Split a String Into the Max Number of Unique Substrings
- 1710. Maximum Units on a Truck
- 1732. Find the Highest Altitude
- 1774. Closest Dessert Cost
- 1833. Maximum Ice Cream Bars
- 1846. Maximum Element After Decreasing and Rearranging
- 1967. Number of Strings that Appear as Substrings in a Word
- 1979. Find Greatest Common Divisor of Array
- 2029. Stone Game IX
- 2095. Delete the Middle Node of a Linked List
- 2130. Maximum Twin Sum of a Linked List
- 2161. Partition Array According to Given Pivot
- 2196. Create Binary Tree From Descriptions
- 2213. Longest Substring of One Repeating Character
- 2446. Determine if Two Events Have Conflict
- 2492. Minimum Score of a Path Between Two Cities
- 2574. Left and Right Sum Differences
- 2685. Count the Number of Complete Components
- 2812. Find the Safest Path in a Grid
- 2958. Length of Longest Subarray With at Most K Frequency
- 2996. Smallest Missing Integer Greater Than Sequential Prefix Sum
- 3014. Minimum Number of Pushes to Type Word I
- 3016. Minimum Number of Pushes to Type Word II
- 3020. Find the Maximum Number of Elements in Subset
- 3090. Maximum Length Substring With Two Occurrences
- 3169. Count Days Without Meetings
- 3185. Count Pairs That Form a Complete Day II
- 3286. Find a Safe Walk Through a Grid
- 3302. Find the Lexicographically Smallest Valid Sequence
- 3310. Remove Methods from Project
- 3336. Find the Number of Subsequences with Equal GCD
- 3345. Smallest Divisible Digit Product
- 3499. Maximize Active Section with Trade I
- 3513. Number of Unique XOR Triplets I
- 3514. Number of Unique XOR Triplets II
- 3517. Smallest Palindromic Rearrangement I
- 3518. Smallest Palindromic Rearrangement II
- 3532. Path Existence Queries in a Graph I
- 3536. Maximum Product of Two Digits
- 3612. Process String with Special Operations I
- 3614. Process String with Special Operations II
- 3620. Network Recovery Pathways
- 3658. GCD of Odd and Even Sums
- 3689. Maximum Total Subarray Value I
- 3691. Maximum Total Subarray Value II
- 3699. Number of ZigZag Arrays I
- 3702. Longest Subsequence With Non-Zero Bitwise XOR
- 3731. Find Missing Elements
- 3737. Count Subarrays with Majority Element I
- 3739. Count Subarrays with Majority Element II
- 3754. Concatenate Non-Zero Digits and Multiply by Sum I
- 3756. Concatenate Non-Zero Digits and Multiply by Sum II
- 3838. Weighted Word Mapping
- 3867. Sum of GCD of Formed Pairs
- 12912. 두 정수 사이의 합
- 12932. 자연수 뒤집어 배열로 만들기
- 12933. 정수 내림차순으로 배치하기
- 12940. 최대공약수와 최소공배수
- 12949. 행렬의 곱셈
- 17681. 비밀지도
- 17682. 다트 게임
- 42889. 실패율
- 68645. 삼각 달팽이
- 72410. 신규 아이디 추천
- 72412. 순위 검색
- 81301. 숫자 문자열과 영단어
- 81302. 거리두기 확인하기
- 87377. 교점에 별 만들기
- 92341. 주차 요금 계산
- 120807. 숫자 비교하기
- 468370. 중요한 단어를 스포 방지
- 1000. A+B
- 1090. 체커
- 1149. RGB 거리
- 1182. 부분수열의 합
- 1238. 파티
- 1260. DFS와 BFS
- 1300. K번째 수
- 1417. 국회의원 선거
- 1438. 가장 작은 직사각형
- 1484. 다이어트
- 1497. 기타콘서트
- 1519. 부분 문자열 뽑기 게임
- 1520. 내리막 길
- 1553. 도미노 찾기
- 1637. 날카로운 눈
- 1654. 랜선 자르기
- 1687. 행렬 찾기
- 1695. 팰린드롬 만들기
- 1697. 숨바꼭질
- 1699. 제곱수의 합
- 1749. 점수따먹기
- 1753. 최단경로
- 1759. 암호 만들기
- 1806. 부분합
- 1912. 연속합
- 1937. 욕심쟁이 판다
- 2003. 수들의 합 2
- 2015. 수들의 합 4
- 2082. 시계
- 2110. 공유기 설치
- 2121. 넷이 놀기
- 2143. 두 배열의 합
- 2216. 문자열과 점수
- 2304. 창고 다각형
- 2309. 일곱 난쟁이
- 2435. 기상청 인턴 신현수
- 2467. 용액
- 2503. 숫자 야구
- 2508. 사탕 박사 고창영
- 2557. Hello World
- 2559. 수열
- 2563. 색종이
- 2583. 영역 구하기
- 2600. 구슬게임
- 2613. 숫자구슬
- 2616. 소형기관차
- 2667. 단지번호붙이기
- 2792. 보석 상자
- 2805. 나무 자르기
- 2851. 슈퍼 마리오
- 2875. 대회 or 인턴
- 2961. 도영이가 만든 맛있는 음식
- 3020. 개똥벌레
- 3273. 두 수의 합
- 3673. 나눌 수 있는 부분 수열
- 3933. 라그랑주의 네 제곱수 정리
- 5569. 출근 경로
- 5875. 오타
- 6131. 완전 제곱수
- 7453. 합이 0인 네 정수
- 7569. 토마토
- 7576. 토마토
- 7696. 반복하지 않는 수
- 8983. 사냥꾼
- 9007. 카누 선수
- 9417. 최대 GCD
- 10655. 마라톤 1
- 10815. 숫자 카드
- 10816. 숫자 카드 2
- 11066. 파일 합치기
- 11659. 구간 합 구하기 4
- 11660. 구간 합 구하기 5
- 10699. 오늘 날짜
- 10819. 차이를 최대로
- 10942. 팰린드롬?
- 11728. 배열 합치기
- 12002. Field Reduction (Silver)
- 12865. 평범한 배낭
- 12991. 홍준이의 행렬
- 13423. Three Dots
- 13702. 이상한 술집
- 14224. 작은 정사각형 2
- 14400. 편의점 2
- 14453. Hoof, Paper, Scissors (Silver)
- 14501. 퇴사
- 14465. 소가 길을 건너간 이유 5
- 14568. 2017 연세대학교 프로그래밍 경시대회
- 14697. 방 배정하기
- 14718. 용감한 진수
- 14719. 빗물
- 14846. 직사각형과 쿼리
- 14939. 불 끄기
- 15486. 퇴사 2
- 15552. 빠른 A + B
- 15593. Lifeguards (Bronze)
- 15649. N과 M (1)
- 15650. N과 M (2)
- 15651. N과 M (3)
- 15652. N과 M (4)
- 15654. N과 M (5)
- 15655. N과 M (6)
- 15656. N과 M (7)
- 15657. N과 M (8)
- 15686. 치킨 배달
- 15831. 준표의 조약돌
- 15961. 회전 초밥
- 15970. 화살표 그리기
- 15971. 두 로봇
- 16283. Farm
- 16472. 고냥이
- 16498. 작은 벌점
- 16955. 오목, 이길 수 있을까?
- 17136. 색종이 붙히기
- 17252. 삼삼한 수
- 17286. 유미
- 17611. 직각다각형
- 17945. 통학의 신
- 18310. 안테나
- 19532. 수학은 비대면강의입니다
- 19951. 태상이의 훈련소 생활
- 20033. Square, Not Rectangle
- 20366. 같이 눈사람 만들래?
- 20544. 공룡게임
- 22862. 가장 긴 짝수 연속한 부분 수열 (large)
- 22945. 팁 빌딩
- 22988. 재활용 캠페인
- 23032. 서프라이즈~
- 23351. 물 주기
- 23831. 나 퇴사임?
- 23880. Walking Home
- 24525. SKK 문자열
- 24956. 나는 정말 휘파람을 못 불어
- 25332. 수들의 합 8
- 25419. 정수를 끝까지 외치자
- 27728. 개구리와 쿼리
- 28447. 마라탕 재료 고르기
- 28449. 누가 이길까
- 30464. 시간낭비
One package per task, named after the task ID with the underscore turned into a package separator:
abc471_a lives in atcoder.abc471.a. AtCoder requires every Java submission to declare
public class Main, so each task needs a package of its own.
-
- Bronze
-
- Bronze
-
- Bronze
-
- Bronze
-
- Bronze
-
- Bronze
-
- Bronze
-
- Bronze
- Meta
- Apple
- Hyundai Autoever