zoj 3085 Sylvester Construction

#include <cstdio>int main() {    int re;    bool flag;    long long n, x, y, w, h;    scanf("%d", &re);    for (int ri = 1; ri <= re; ++ri) {        scanf("%lld%lld%lld%lld%lld", &n, &x, &y, &w, &h);        for (long long i = y; i < y + h; ++i) { for (long long j = x; j < x + w; ++j) {     flag = false;     for (long long m = n >> 1; m > 0; m >>= 1) {         if (i & j & m) {  flag = !flag;         }     }     if (flag) {         putchar('-');     }     putchar('1');     putchar(j == x + w - 1 ? 'n' : ' '); }        }        putchar('n');    }    return 0;}