Submission #340802

#	Time	Username	Problem	Language	Result	Execution time	Memory
340802		NachoLibre	Red-blue table (IZhO19_stones)	C++14	28 / 100	35 ms	1388 KiB

stones

#include <bits/stdc++.h>
using namespace std;

int t, n, m, k, b[4], fp;
bitset<4> s[4], fps[4];

void G(int ii) {
	if(ii == n) {
		int tp = 0;
		for(int i = 0; i < n; ++i) {
			int x = 0;
			for(int j = 0; j < m; ++j) {
				if(s[i][j]) ++x;
			}
			if(x > m - x) ++tp;
		}
		for(int i = 0; i < m; ++i) {
			int x = 0;
			for(int j = 0; j < n; ++j) {
				if(!s[j][i]) ++x;
			}
			if(x > n - x) ++tp;
		}
		if(tp > fp) {
			fp = tp;
			for(int i = 0; i < n; ++i) {
				fps[i] = s[i];
			}
		}
		return;
	}
	for(b[ii] = 0; b[ii] < k; ++b[ii]) {
		s[ii] = b[ii];
		G(ii + 1);
	}
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> t;
	for(int ti = 1; ti <= t; ++ti) {
		cin >> n >> m;
		if(n <= 4 && m <= 4) {
			k = (1 << m);
			fp = 0;
			G(0);
			cout << fp << "\n";
			for(int i = 0; i < n; ++i) {
				for(int j = 0; j < m; ++j) {
					if(fps[i][j]) cout << "+";
					else cout << "-";
				}
				cout << "\n";
			}
		} else {
			if(n == 1) {
				cout << m << "\n";
				for(int i = 1; i <= m; ++i) {
					cout << "-";
				}
				cout << "\n";
			} else if(m == 1) {
				cout << n << "\n";
				for(int i = 1; i <= n; ++i) {
					cout << "+";
					cout << "\n";
				}
			} else {
				int ns = (n - 1) / 2 * 2, ms = (m - 1) / 2 * 2;
				cout << ns + ms << "\n";
				for(int i = 1; i <= n; ++i) {
					for(int j = 1; j <= m; ++j) {
						if(i > ns) {
							cout << "-";
						} else if(j > ms) {
							cout << "+";
						} else {
							cout << (((i + j) & 1) ? "-" : "+");
						}
					}
					cout << "\n";
				}
			}
		}
		#ifdef WEEE
		cout << flush;
		#endif
	}
	cout << flush;
	return 0;
}

• Subtask 1: 17 / 17
• Subtask 2: 0 / 10
• Subtask 3: 0 / 16
• Subtask 4: 11 / 11
• Subtask 5: 0 / 15
• Subtask 6: 0 / 31