You are given two arrays (without duplicates) nums1 and nums2 where nums1’s elements are subset of nums2. Find…

原文地址：https://leetcode.com/problems/subdomain-visit-count/description/ 大意：本题比较繁琐。类似于分类然后算加减法。 class Solution: d…

FB Tag Hard 最基本的方法是开一个2d dp array, dp[i][j]这里表示的是当第i个房子是j color时所需要的最小花费，所以我们最后要得到的是k个dp[n – 1][k]中的最小值.…

Given two integers representing the numerator and denominator of a fraction, return the fraction in string for…

  Given a set of candidate numbers (candidates) (without duplicates) and a target num…

  Write a program to find the node at which the intersection of two singly linked lists begins.   Fo…

  Given a string s and a non-empty string p, find all the start indices of …

  For an integer n, we call k>=2 a good base of n, if all digits of n base k are 1. Now given a string…

题目： Given a string, find the length of the longest substring without repeating characters. For example, the lo…

这是悦乐书的第257次更新，第270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124题（顺位题号是543）。给定二叉树，您需要计算树的直径长度。 二叉树的直径是树中任意两个节点之间最长…

Easy Given two strings A and B, find the minimum number of times A has to be repeated such that B is a substri…

Easy 这道题mock的时候没做出来，老师说这种送分题应该是几分钟就写好的，我汗。 recursive way /** * Definition for a binary tree node. * public cla…