Submission #501715

#	Time	Username	Problem	Language	Result	Execution time	Memory
501715		Mazaalai	Red-blue table (IZhO19_stones)	C++17	38 / 100	25 ms	1288 KiB

stones

#include <bits/stdc++.h>
using namespace std;
string s = "+-";
void go() {
	int n, m;
	cin >> n >> m;
	if (n == 1) {
		cout << m << '\n';
		for (int i = 0; i < m; i++) cout << s[1];
		cout << '\n';
		return;
	}
	if (m == 1) {
		cout << n << '\n';
		for (int i = 0; i < n; i++) cout << s[0] << '\n';
		return;
	}
	if (n == 2) {
		cout << m << '\n';
		for (int i = 0; i < m; i++) cout << s[1];
		cout << '\n';
		for (int i = 0; i < m; i++) cout << s[1];
		cout << '\n';
		return;	
	}
	if (m == 2) {
		cout << n << '\n';
		for (int i = 0; i < n; i++) cout << s[0] << s[0] << '\n';
		return;
	}
	if (n == 3) {
		cout << m+1 << '\n';
		for (int i = 0; i < m; i++) cout << s[1];
		cout << '\n';
		for (int i = 0; i < m; i++) cout << s[1];
		cout << '\n';
		for (int i = 0; i < m; i++) cout << s[0];
		cout << '\n';
		return;
	}
	if (m == 3) {
		cout << n+1 << '\n';
		for (int i = 0; i < n; i++) cout << s[0] << s[0] << s[1] << '\n';
		return;
	}
	if (n & 1 && m & 1) {
		cout << n+m-2 << '\n';
		for (int i = 1; i <= n; i++) {
			for (int j = 1; j <= m; j++) {
				if (i == n) cout << s[1];
				else if (j == m) cout << s[0];
				else cout << s[(i+j)%2];
			}
			cout << '\n';
		}
		return;
	}
	if (n == 4) {
		cout << m+1 << '\n';
		for (int i = 0; i < m; i++) cout << s[1];
		cout << '\n';
		for (int i = 0; i < m; i++) cout << s[1];
		cout << '\n';
		for (int i = 0; i < m; i++) cout << s[1];
		cout << '\n';
		for (int i = 0; i < m; i++) cout << s[0];
		cout << '\n';
		return;
	}
	if (m == 4) {
		cout << n << '\n';
		for (int i = 0; i < n; i++) cout << s[0] << s[0] << s[0] << s[1] << '\n';
		return;
	}
	if (n % 2 == 0 && m % 2 == 0) {
		cout << n+m-4 << '\n';
		for (int i = 1; i <= n; i++) {
			for (int j = 1; j <= m; j++) {
				if (i == n || i == n-1) cout << s[1];
				else if (j == m || j == m-1) cout << s[0];
				else cout << s[(i+j)%2];
			}
			cout << '\n';
		}
		return;
	}

}
signed main() {
	ios::sync_with_stdio(0);
	cin.tie();
	cout.tie();
	// freopen("in.txt", "r", stdin);
	// freopen("out.txt", "w", stdout);
	int T;
	cin >> T;
	while(T--) go();

}

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