LeetCode 47. Permutations II
Description https://leetcode.com/problems/permutations-ii/ Given a collection of numbers, nums, that might contain duplicates, return all possible unique permutations in any order. Example 1: Input: nums…
Category: Backtracking
LeetCode 77. Combinations
Description https://leetcode.com/problems/combinations/ Given two integers n and k, return all possible combinations of k numbers out of the range [1, n]. You may return the answer in any…
LeetCode 1641. Count Sorted Vowel Strings
Description https://leetcode.com/problems/count-sorted-vowel-strings/ Given an integer n, return the number of strings of length n that consist only of vowels (a, e, i, o, u) and are lexicographically sorted. A…
LeetCode 1863. Sum of All Subset XOR Totals
Description https://leetcode.com/problems/sum-of-all-subset-xor-totals/ The XOR total of an array is defined as the bitwise XOR of all its elements, or 0 if the array is empty. For example, the XOR…
LeetCode 351. Android Unlock Patterns
Description https://leetcode.com/problems/android-unlock-patterns/ Given an Android 3×3 key lock screen and two integers m and n, where 1 ≤ m ≤ n ≤ 9, count the…
LeetCode 212. Word Search II
Description https://leetcode.com/problems/word-search-ii/ Given an m x n board of characters and a list of strings words, return all words on the board. Each word must…
LeetCode 425. Word Squares
Description https://leetcode.com/problems/word-squares/ Given a set of words (without duplicates), find all word squares you can build from them. A sequence of words forms…
LeetCode 51. N-Queens
Description https://leetcode.com/problems/n-queens/ The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given…
LeetCode 37. Sudoku Solver
Description https://leetcode.com/problems/sort-colors/ Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all of the…
LeetCode 79. Word Search
Description https://leetcode.com/problems/word-search/ Given a 2D board and a word, find if the word exists in the grid. The word can…