AABB Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 TC Description One day, Jamie noticed that many English words only use the letters A and B. Examples of such words include "AB" (short for abdominal), "BAA" (the noise a sheep makes), &…
ChessFloor Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 TC Description Samantha is renovating a square room. The floor of the room is an N times N grid of unit square tiles. Each tile has some color. You are given the current colors of all tiles in a…
LuckyXorTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 TC Description A lucky number is a positive integer consisting of only the digits 4 and 7.Given an int a, return an int b strictly greater than a, such that a XOR b is a lucky number. (See Notes fo…