Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary sea…

Given a binary tree and a sum, find all root-to-leaf paths where each path’s sum equals the given sum. F…

主要考察的是代码的完整性：是否将所有情况考虑清楚，以及错误的输入情况。考察思考问题是否全面。 题目描述： 给定一个double类型的浮点数base和int类型的整数exponent。求base的exponent次方。 输…

这是悦乐书的第198次更新，第205篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第61题（顺位题号是242）。给定两个字符串s和t，写一个函数来确定t是否是s的anagram。例如： 输入…

题目地址：https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/description/ 大意：给定一个整数数组，其中1 ≤ a[i…

  Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 t…

On a broken calculator that has a number showing on its display, we can perform two operations:Double: Multipl…

Given an unsorted integer array, find the first missing positive integer. For example, Given [1,2,0] …

Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C wher…

Given n non-negative integers a1, a2, …, an, where each represents a point at c…

Description: Find how many palindromic subsequence (need not necessarily be distinct) can be formed in a given…

本文首发于我的个人博客：尾尾部落 题目描述 汇编语言中有一种移位指令叫做循环左移（ROL），现在有个简单的任务，就是用字符串模拟这个指令的运算结果。对于一个给定的字符序列S，请你把其循环左移K位后的序列输出。例如，字符序…