随笔分类 - 算法
本分类用于存放一些算法题，主要来源于Leetcode。
摘要：题目 Given an integer n, return true if it is a power of two. Otherwise, return false. An integer n is a power of two, if there exists an integer x such
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摘要：题目 Given a triangle array, return the minimum path sum from top to bottom. For each step, you may move to an adjacent number of the row below. More fo
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摘要：题目 You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping
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摘要：题目 You are climbing a staircase. It takes n steps to reach the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you cli
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摘要：题目 Given a string s, you can transform every letter individually to be lowercase or uppercase to create another string. Return a list of all possible
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摘要：题目 Given an array nums of distinct integers, return all the possible permutations. You can return the answer in any order. Example 1: Input: nums = [1
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摘要：题目 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 order. Example
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摘要：题目 Given the head of a singly linked list, reverse the list, and return the reversed list. Example 1: Input: head = [1,2,3,4,5] Output: [5,4,3,2,1] Ex
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摘要：题目 You are given a perfect binary tree where all leaves are on the same level, and every parent has two children. The binary tree has the following de
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摘要：题目 You are given the heads of two sorted linked lists list1 and list2. Merge the two lists in a one sorted list. The list should be made by splicing t
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摘要：题目 You are given an m x n grid where each cell can have one of three values: 0 representing an empty cell, 1 representing a fresh orange, or 2 represe
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摘要：题目 Given an m x n binary matrix mat, return the distance of the nearest 0 for each cell. The distance between two adjacent cells is 1. Example 1: Inpu
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摘要：题目 You are given two binary trees root1 and root2. Imagine that when you put one of them to cover the other, some nodes of the two trees are overlappe
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摘要：题目 You are given an m x n binary matrix grid. An island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) You
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摘要：题目 An image is represented by an m x n integer grid image where image[i][j] represents the pixel value of the image. You are also given three integers
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摘要：题目 Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. In other words, return true if one of s1's permuta
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摘要：题目 Given a string s, find the length of the longest substring without repeating characters. Example 1: Input: s = "abcabcbb" Output: 3 Explanation: Th
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摘要：题目 Given the head of a linked list, remove the nth node from the end of the list and return its head. Example 1: Input: head = [1,2,3,4,5], n = 2 Outp
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摘要：题目 Given the head of a singly linked list, return the middle node of the linked list. If there are two middle nodes, return the second middle node. Ex
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摘要：题目 Given a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. Example
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