Submission #1156550

#	Time	Username	Problem	Language	Result	Execution time	Memory
1156550		UmairAhmadMirza	Red-blue table (IZhO19_stones)	C++20	10 / 100	48 ms	1352 KiB

stones

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

#define ll long long
int const N=2e5+5;
int const mod=1e9+7;

int n,m;

int calcu(vector<vector<bool>> v){
	// cout<<n<<' '<<m<<endl;
	int a=0;
	for(int i=0;i<n;i++){
		int c=0;
		for(int j=0;j<m;j++)
			if(v[i][j]==1)
				c++;
		if(c*2>m)
			a++;
	}
	for(int j=0;j<m;j++){
		int c=0;
		for(int i=0;i<n;i++){
			if(v[i][j]==0)
				c++;
		}
		if(c*2>n)
			a++;
	}
	return a;
}

void solve(){
	// int n,m;
	cin>>n>>m;
	if(min(n,m)<=3){
		int hm=(m/2)+1,hn=(n/2)+1;
		if(m+(n-hn)>(n+(m-hm))){
			cout<<m+(n-hn)<<endl;
			for (int i = 1; i <=n; ++i)
			{
				for(int j=1;j<=m;j++){
					if(j<=hm && i<=(n-hn))
						cout<<'+';
					else
						cout<<'-';
				}
				cout<<endl;
			}
		}
		else{
			cout<<n+(m-hm)<<endl;
			for (int i = 1; i <=n; ++i)
			{
				for(int j=1;j<=m;j++){
					if(i<=hn && j<=(m-hm))
						cout<<'-';
					else
						cout<<'+';
				}
				cout<<endl;
			}
		}
		return;
	}
	int hm=(m/2)+1,hn=(n/2)+1;
	cout<<hm<<' '<<hn<<endl;
	vector<vector<bool>> a1,a2;
	for(int i=1;i<=n;i++){
		a1.push_back({});
		for(int j=1;j<=m;j++){
			if((j<=hm && i<=(n-hn)) || (i>hn && j>(m-hm)))
				a1[i-1].push_back(1);
			else
				a1[i-1].push_back(0);
		}
	}
	for(int i=1;i<=n;i++){
		a2.push_back({});
		for(int j=1;j<=m;j++){
			if((i<=hn && j<=(m-hm)) || (j>hm && i>(n-hn)))
				a2[i-1].push_back(1);
			else
				a2[i-1].push_back(0);
		}
	}
	int aa1=calcu(a1),aa2=calcu(a2);
	// cout<<aa1<<' '<<aa2<<endl;
	if(aa1<aa2)
		swap(a1,a2);
	cout<<max(aa1,aa2)<<endl;
	string st="-+";
	for (int i = 0; i < n; ++i){
		for (int j = 0; j < m; ++j)
			cout<<st[a1[i][j]];
		cout<<endl;
	}
}
int main(){
	int t;
	cin>>t;
	while(t--)
		solve();
}

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