MrBlank的ACM记事本

Status Description There is an N*M matrix with only 0s and 1s, (1 <= N,M <= 1000). An exact cover is a selection of rows such that every column has a 1 in exactly one of the selected rows. Try to fin

Description Your boss once had got many copies of a treasure map. Unfortunately, all the copies are now broken to many rectangular pieces, and what make it worse, he has lost some of the pieces. Lucki

Sudoku Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%lld & %llu SubmitStatus Description In the game of Sudoku, you are given a large 9 × 9 grid divided into smaller 3 × 3 subgrid

未AC代码#include <stdio.h>#include <string.h>#include <iostream>#include <algorithm>#include <vector>#include <queue>#include <set>#include <map>#include <string>#include <math.h>#include <stdli