xinyu04

摘要： Given the roots of two binary trees root and subRoot, return true if there is a subtree of root with the same structure and node values of subRoot and 阅读全文

摘要： Given a binary tree struct Node { int val; Node *left; Node *right; Node *next; } Populate each next pointer to point to its next right node. If there 阅读全文

摘要： Five pirates have come across a treasure of 1000 coins. According to pirate rules the pirate of highest rank must make a suggestion on how to divide t 阅读全文

摘要： You and your partner in crime are both arrested and questioned separately. You are offered a chance to confess, in which you agree to testify against 阅读全文

摘要： You are given an array of integers nums, there is a sliding window of size $k$ which is moving from the very left of the array to the very right. You 阅读全文

摘要： There are $n$ cities. Some of them are connected, while some are not. If city $a$ is connected directly with city $b$, and city $b$ is connected direc 阅读全文

摘要： Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. An island is surrounded by wa 阅读全文

摘要： You are a cook in a remote area with no clocks or other way of keeping time other than a 4 minute hourglass and a 7 minute hourglass. You do have a st 阅读全文

摘要： Given four integer arrays nums1, nums2, nums3, and nums4 all of length n, return the number of tuples (i, j, k, l) such that: $0 \le i, j, k, l < n$ n 阅读全文

摘要： Given an array of positive integers nums and a positive integer target, return the minimal length of a contiguous subarray [numsl, numsl+1, ..., numsr 阅读全文