西野辉夜

Given a positive integer, output its complement number. The complement strategy is to flip the bits

Given a binary tree, find the leftmost value in the last row of the tree. Example 1: Input: / 1 3 Ou

Given two binary trees and imagine that when you put one of them to cover the other, some nodes of t

Given an 2D board, count how many battleships are in it. The battleships are represented with 'X's,

Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others

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

You're now a baseball game point recorder. Given a list of strings, each string can be one of the 4

Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot m

复数乘法的问题 i的平方=-1； Given two strings representing two complex numbers. You need to return a string rep