Submission #223790

#	Time	Username	Problem	Language	Result	Execution time	Memory
223790		socho	Red-blue table (IZhO19_stones)	C++14	0 / 100	100 ms	1476 KiB

stones

#include "bits/stdc++.h"
using namespace std;
// #define endl '\n'
// #define double long double
// #define int long long
// int MOD = 1000 * 1000 * 1000 + 7;
// int MOD = 998244353;

int n, m;

int score(vector<vector<bool> > a) {
	int col[m], row[n];
	memset(col, 0, sizeof col);
	memset(row, 0, sizeof row);
	for (int i=0; i<n; i++) {
		for (int j=0; j<m; j++) {
			if (a[i][j]) {
				row[i]++;
				col[j]--;
			}
			else {
				row[i]--;
				col[j]++;
			}
		}
	}
	int ans = 0;
	for (int i=0; i<m; i++) {
		if (col[i] > 0) ans++;
	}
	for (int i=0; i<n; i++) {
		if (row[i] > 0) ans++;
	}
	return ans;
}

void show(vector<vector<bool> > a) {
	for (int i=0; i<n; i++) {
		for (int j=0; j<m; j++) {
			cout << (a[i][j] ? '+' : '-');
		}
		cout << endl;
	}
}

void solve() {
	
	cin >> n >> m;
	
	int rfill = (m + 1) / 2;
	int cfill = (n + 1) / 2;
	
	vector<vector<bool> > grid1(n, vector<bool>(m, 0)); // allrows
	vector<vector<bool> > grid2(n, vector<bool>(m, 1)); // allcols
	
	// true is +, false is -
	
	for (int i=0; i<n; i++) {
		// all rows
		if (i % 2 == 0) {
			for (int j=0; j<rfill; j++) {
				grid1[i][j] = true;
			}
		}
		else {
			int k = m - 1;
			for (int j=0; j<rfill; j++, k--) {
				grid1[i][k] = true;
			}
		}
	}
	
	for (int i=0; i<m; i++) {
		// all cols
		if (i % 2 == 0) {
			for (int j=0; j<cfill; j++) {
				grid2[j][i] = false;
			}
		}
		else {
			int k = n - 1;
			for (int j=0; j<cfill; j++, k--) {
				grid2[k][i] = false;
			}
		}
	}
	
	int asc = score(grid1);
	int bsc = score(grid2);
	
	if (asc > bsc) {
		cout << asc << endl;
		show(grid1);
	}
	else {
		cout << bsc << endl;
		show(grid2);
	}
	
	
}

signed main() {
	
	int t;
	cin >> t;
	while (t--) solve();
	
}

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