ACM题目，

#include int main(){ char a[200][201]; int x, y; int i, j, k; char c; int flag; char b[50000]; // 开得不够大啊 scanf("%d%d", &x, &y); // x,y反了…… k = x; x = y; y = k; getchar(); while (gets(b)) { flag = 0; i = 0; j = 0; k = 0; do