随笔分类 - LeetCode
摘要：Given an m x n grid of characters board and a string word, return true if word exists in the grid. The word can be constructed from letters of sequent
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摘要：Given an integer array nums sorted in non-decreasing order, remove some duplicates in-place such that each unique element appears at most twice. The r
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摘要：Given an integer array nums sorted in non-decreasing order, remove the duplicates in-place such that each unique element appears only once. The relati
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摘要：There is an integer array nums sorted in non-decreasing order (not necessarily with distinct values). Before being passed to your function, nums is ro
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摘要：There is an integer array nums sorted in ascending order (with distinct values). Prior to being passed to your function, nums is possibly rotated at a
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摘要：Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit
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摘要：You are given an m x n integer matrix matrix with the following two properties: Each row is sorted in non-decreasing order. The first integer of each
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摘要：Given a rows x cols binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. Example 1: Input: matri
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摘要：Given an array of integers heights representing the histogram's bar height where the width of each bar is 1, return the area of the largest rectangle
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摘要：Reverse bits of a given 32 bits unsigned integer. Example 1: Input: 00000010100101000001111010011100 Output: 00111001011110000010100101000000 Explanat
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摘要：Given the head of a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should p
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摘要：We can scramble a string s to get a string t using the following algorithm: If the length of the string is 1, stop. If the length of the string is > 1
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摘要：An n-bit gray code sequence is a sequence of 2n integers where: Every integer is in the inclusive range [0, 2n - 1], The first integer is 0, An intege
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摘要：A message containing letters from A-Z is being encoded to numbers using the following mapping: Given a non-empty string containing only digits, determ
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摘要：Given a collection of integers that might contain duplicates, S, return all possible subsets. Note: Elements in a subset must be in non-descending ord
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摘要：Given an integer array nums of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Retu
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摘要：Reverse a linked list from position m to n. Do it in one-pass. Note: 1 ≤ m ≤ n ≤ length of list. Example: Input: 1->2->3->4->5->NULL, m = 2, n = 4 Out
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摘要：Given a string containing only digits, restore it by returning all possible valid IP address combinations. Example: Input: "25525511135" Output: ["255
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摘要：Given an integer n, generate all structurally unique BST's (binary search trees) that store values 1 ... n. Example: Input: 3 Output: [ [1,null,3,2],
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摘要：Given n, how many structurally unique BST's (binary search trees) that store values 1 ... n? Example: Input: 3 Output: 5 Explanation: Given n = 3, the
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