Submission #1127838

#	Time	Username	Problem	Language	Result	Execution time	Memory
1127838		kirakosyan	Red-blue table (IZhO19_stones)	C++20	27 / 100	46 ms	1348 KiB

stones

#include<algorithm>
#include<iostream>
#include<vector>
#include<string>
#include<random>
#include<cmath>
#include<stack>
#include<map>
#include <iomanip>
#include <queue>
#include <set>
using namespace std;
using ll = long long;
using ull = unsigned long long;
ll mod = 1e9 + 7;
ll pv(ll a, ll b) {
	if (b == 0)return 1;
	ll res = (pv(a, b / 2));
	if (b % 2) {
		return (((res * res) % mod) * (a % mod)) % mod;
	}
	else {
		return (res * res) % mod;
	}
}
ll gcd(ll a, ll b) {
	while (b) {
		a %= b;
		swap(a, b);
	}
	return a;
}
void solve() {
	int n, m;
	cin >> n >> m;
	if(m<=4&&n<=4) {
		int mx = 0;
		vector<vector<int>>ansik;
		for (int p = 0; p < (1 << (n * m)); p++) {
			vector<vector<int>>v(n, vector<int>(m));
			for (int j = 0; j < n * m; j++) {
				if (p & (1 << j)) {
					v[j / m][j % m]++;
				}
			}
			int ans = 0;
			for (int i = 0; i < n; i++) {
				int cnt = 0;
				for (int j = 0; j < m; j++) {
					if (v[i][j])cnt++;
					else cnt--;
				}
				if (cnt>=1)ans++;
			}

			for (int j = 0; j < m; j++) {
				int cnt = 0;
				for (int i = 0; i < n; i++) {
					if (v[i][j] == 0)cnt++;
					else cnt--;
				}
				if (cnt>=1)ans++;
			}
			if (ans > mx) {
				mx = ans;
				ansik = v;
			}

		}
		cout << mx << endl;
		for(int i=0; i<n; i++) {
			for(int j=0; j<m; j++) {
				if(ansik[i][j]) {
					cout<<"+";
				}
				else cout<<"-";
			}
			cout<<endl;
		}
	}
	else if(min(n,m)<=5) {
		if(n<=2) {
			cout<<m<<endl;
			for(int i=0; i<n; i++) {
				for(int i=0; i<m; i++) {
					cout<<'-';
				}
				cout<<endl;
			}
		}
		else if(m<=2) {
			cout<<n<<endl;
			for(int i=0; i<n; i++) {
				for(int j=0; j<m; j++) {
					cout<<'+';
				}
				cout<<endl;
			}
		}
		else if(min(m,n)==3||min(m,n)==4){
			if(n<m) {
				cout<<m+1<<endl;
				for(int i=0; i<n-1; i++) {
					for(int i=0; i<m; i++)cout<<'-';
					cout<<endl;
				}

				for(int i=0; i<m; i++)cout<<'+';
				cout<<endl;
			}
			else {
				cout<<n+1<<endl;
				for(int i=0; i<n; i++) {
					if(m==3)cout<<"++-"<<endl;
					else if(m==4)cout<<"+++-"<<endl;
				}
			}
		}

	}
	else {
		if(m>n) {
			cout<<m+n/2<<endl;
			for(int i=0; i<(n+1)/2; i++) {
				for(int j=0; j<m; j++) {
					cout<<'-';
				}
				cout<<endl;
			}
			for(int i=0; i<n/2; i++) {
				for(int j=0; j<m; j++) {
					cout<<'+';
				}
				cout<<endl;
			}
		}
		else {
			cout<<n+m/2<<endl;
			for(int i=0; i<n; i++) {
				for(int j=0; j<(m+1)/2; j++) {
					cout<<'+';
				}
				for(int j=0; j<m/2; j++) {
					cout<<'-';
				}
				cout<<endl;
			}
		}
	}
}

signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	ll _ = 1;
	cin >> _;
	while (_--) {
		solve();
	}
}

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