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LeetCode Solutions

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English translations of the active LeetCode solutions, including explanations, code, formulas, and examples. Archived notes are intentionally omitted.

2026

LeetCode Daily Challenge: Example

LeetCode Daily Challenge: Example

Feb 4, 2026·10 words·1 min· loading · loading

2022

LeetCode 926: Flip String to Monotone Increasing

LeetCode 926: Flip String to Monotone Increasing

Jun 11, 2022·600 words·3 mins· loading · loading

LeetCode 219: Contains Duplicate II

LeetCode 219: Contains Duplicate II

Jan 19, 2022·263 words·2 mins· loading · loading

LeetCode 539: Minimum Time Difference

LeetCode 539: Minimum Time Difference

Jan 18, 2022·309 words·2 mins· loading · loading

LeetCode 1220: Count Vowels Permutation

LeetCode 1220: Count Vowels Permutation

Jan 17, 2022·416 words·2 mins· loading · loading

LeetCode 382: Linked List Random Node

LeetCode 382: Linked List Random Node

Jan 16, 2022·631 words·3 mins· loading · loading

LeetCode 1716: Calculate Money in Leetcode Bank

LeetCode 1716: Calculate Money in Leetcode Bank

Jan 15, 2022·642 words·4 mins· loading · loading

LeetCode 373: Find K Pairs with Smallest Sums

LeetCode 373: Find K Pairs with Smallest Sums

Jan 14, 2022·555 words·3 mins· loading · loading

LeetCode 747: Largest Number At Least Twice of Others

LeetCode 747: Largest Number At Least Twice of Others

Jan 13, 2022·469 words·3 mins· loading · loading

LeetCode 334: Increasing Triplet Subsequence

LeetCode 334: Increasing Triplet Subsequence

Jan 12, 2022·447 words·3 mins· loading · loading

2021

LeetCode 825: Friends of Appropriate Ages

LeetCode 825: Friends of Appropriate Ages

Dec 27, 2021·495 words·3 mins· loading · loading

LeetCode 1078: Occurrences After Bigram

LeetCode 1078: Occurrences After Bigram

Dec 26, 2021·213 words·1 min· loading · loading

LeetCode 1705: Maximum Number of Eaten Apples

LeetCode 1705: Maximum Number of Eaten Apples

Dec 24, 2021·668 words·4 mins· loading · loading

LeetCode 686: Repeated String Match

LeetCode 686: Repeated String Match

Dec 22, 2021·225 words·2 mins· loading · loading

LeetCode 1154: Day of the Year

LeetCode 1154: Day of the Year

Dec 21, 2021·209 words·1 min· loading · loading

LeetCode 475: Heaters

LeetCode 475: Heaters

Dec 20, 2021·159 words·1 min· loading · loading

LeetCode 434: Number of Segments in a String

LeetCode 434: Number of Segments in a String

Oct 7, 2021·157 words·1 min· loading · loading

LeetCode 414: Third Maximum Number

LeetCode 414: Third Maximum Number

Oct 6, 2021·181 words·1 min· loading · loading

LeetCode 284: Peeking Iterator

LeetCode 284: Peeking Iterator

Oct 5, 2021·454 words·3 mins· loading · loading

LeetCode 482: License Key Formatting

LeetCode 482: License Key Formatting

Oct 4, 2021·415 words·2 mins· loading · loading

LeetCode 166: Fraction to Recurring Decimal

LeetCode 166: Fraction to Recurring Decimal

Oct 3, 2021·471 words·3 mins· loading · loading

LeetCode 405: Convert a Number to Hexadecimal

LeetCode 405: Convert a Number to Hexadecimal

Oct 2, 2021·277 words·2 mins· loading · loading

LeetCode 1436: Destination City

LeetCode 1436: Destination City

Oct 1, 2021·270 words·2 mins· loading · loading

LeetCode 517: Super Washing Machines

LeetCode 517: Super Washing Machines

Sep 29, 2021·782 words·2 mins· loading · loading

LeetCode 639: Decode Ways II

LeetCode 639: Decode Ways II

Sep 27, 2021·765 words·4 mins· loading · loading

LeetCode 371: Sum of Two Integers

LeetCode 371: Sum of Two Integers

Sep 26, 2021·314 words·2 mins· loading · loading

LeetCode 583: Delete Operation for Two Strings

LeetCode 583: Delete Operation for Two Strings

Sep 25, 2021·562 words·2 mins· loading · loading

2021 LeetCode Autumn Team Competition Review

2021 LeetCode Autumn Team Competition Review

Sep 25, 2021·2433 words·5 mins· loading · loading

LeetCode 326: Power of Three

LeetCode 326: Power of Three

Sep 23, 2021·253 words·2 mins· loading · loading

LeetCode 1583: Count Unhappy Friends

LeetCode 1583: Count Unhappy Friends

Aug 14, 2021·748 words·4 mins· loading · loading

LeetCode 233: Number of Digit One

LeetCode 233: Number of Digit One

Aug 13, 2021·525 words·2 mins· loading · loading

LeetCode 516: Longest Palindromic Subsequence

LeetCode 516: Longest Palindromic Subsequence

Aug 12, 2021·364 words·2 mins· loading · loading

LeetCode 446: Arithmetic Slices II - Subsequence

LeetCode 446: Arithmetic Slices II - Subsequence

Aug 11, 2021·854 words·5 mins· loading · loading

LeetCode 413: Arithmetic Slices

LeetCode 413: Arithmetic Slices

Aug 10, 2021·585 words·2 mins· loading · loading

LeetCode 313: Super Ugly Number

LeetCode 313: Super Ugly Number

Aug 9, 2021·873 words·2 mins· loading · loading

LeetCode 1137: N-th Tribonacci Number

LeetCode 1137: N-th Tribonacci Number

Aug 8, 2021·281 words·2 mins· loading · loading