Submission #502108

#	Time	Username	Problem	Language	Result	Execution time	Memory
502108		enerelt14	Red-blue table (IZhO19_stones)	C++17	100 / 100	32 ms	1240 KiB

stones

#include<bits/stdc++.h>
using namespace std;
void solve(){
	int n, m;
	cin>>n>>m;
	if (n==1){
		cout<<m<<"\n";
		for (int i=1;i<=m;i++)cout<<"-";
		cout<<"\n";
		return;
	}
	if (m==1){
		cout<<n<<"\n";
		for (int i=1;i<=n;i++)cout<<"+\n";
		return;	
	}
	if (n==2){
		cout<<m<<"\n";
		for (int i=1;i<=2;i++){
			for (int j=1;j<=m;j++){
				cout<<"-";
			}
			cout<<"\n";
		}
		return;
	}
	if (m==2){
		cout<<n<<"\n";
		for (int i=1;i<=n;i++){
			for (int j=1;j<=2;j++){
				cout<<"+";
			}
			cout<<"\n";
		}
		return;
	}
	if (n%2==1 && m%2==1){
		cout<<n+m-2<<"\n";
		for (int i=1;i<=n;i++){
			for (int j=1;j<=m;j++){
				if (i!=n && j!=m){
					if ((i+j)%2==1)cout<<"-";
					else cout<<"+";
					continue;
				}
				if (i==n)cout<<"-";
				else cout<<"+";
			}
			cout<<"\n";
		}
		return;
	}
	if (n%2==0 && m%2==0){
		if (n/2>=m-3){
			cout<<n+m-3<<"\n";
			int l=m/2-2, x, y, z;
			for (int i=1;i<=n;i++){
				for (int j=1;j<=m-3;j++){
					if (l==0){
						cout<<"-";
						continue;
					}
					x=i%(m-3);
					if (x==0)x+=(m-3);
					y=(x*l)%(m-3);
					z=((x-1)*l)%(m-3);
					if (y>z){
						if (y>=j && z<j)cout<<"+";
						else cout<<"-";
					}
					else{
						if (y>=j || z<j)cout<<"+";
						else cout<<"-";
					}
				}
				cout<<"+++\n";
			}
			return;
		}
		if (m/2>=n-3){
			cout<<n+m-3<<"\n";
			int l=n/2-2, x, y, z;
			for (int i=1;i<=n-3;i++){
				for (int j=1;j<=m;j++){
					if (l==0){
						cout<<"+";
						continue;
					}
					x=j%(n-3);
					if (x==0)x+=(n-3);
					y=(x*l)%(n-3);
					z=((x-1)*l)%(n-3);
					if (y>z){
						if (y>=i && z<i)cout<<"-";
						else cout<<"+";
					}
					else{
						if (y>=i || z<i)cout<<"-";
						else cout<<"+";
					}
				}
				cout<<"\n";
			}
			for (int i=1;i<=3;i++){
				for (int j=1;j<=m;j++){
					cout<<"-";
				}
				cout<<"\n";
			}
			return;
		}
		else{
			cout<<n+m-4<<"\n";
			for (int i=1;i<=n;i++){
				for (int j=1;j<=m;j++){
					if (i<n-1 && j<m-1){
						if ((i+j)%2==0)cout<<"+";
						else cout<<"-";
						continue;
					}
					if (i>n-2)cout<<"-";
					else cout<<"+";
				}
				cout<<"\n";
			}
		}
		return;
	}
	if (n%2==0){
		if (n>=2*(m-2)){
			cout<<n+m-2<<"\n";
			int l=m/2-1, x, y, z;
			for (int i=1;i<=n;i++){
				for (int j=1;j<=m-2;j++){
					if (l==0){
						cout<<"-";
						continue;
					}
					x=i%(m-2);
					if (x==0)x+=(m-2);
					y=(x*l)%(m-2);
					z=((x-1)*l)%(m-2);
					if (y>z){
						if (y>=j && z<j)cout<<"+";
						else cout<<"-";
					}
					else{
						if (y>=j || z<j)cout<<"+";
						else cout<<"-";
					}
				}
				cout<<"++\n";
			}
			return;
		}
		else{
			cout<<n+m-3<<"\n";
			for (int i=1;i<=n;i++){
				for (int j=1;j<=m;j++){
					if (i<=n-2 && j<=m-1){
						if ((i+j)%2==0)cout<<"+";
						else cout<<"-";
						continue;
					}
					if (i>n-2)cout<<"-";
					else cout<<"+";
				}
				cout<<"\n";
			}
			return;
		}
	}
	else{
		if (m>=2*(n-2)){
			cout<<n+m-2<<"\n";
			int l=n/2-1, x, y, z;
			for (int i=1;i<=n-2;i++){
				for (int j=1;j<=m;j++){
					if (l==0){
						cout<<"+";
						continue;
					}
					x=j%(n-2);
					if (x==0)x+=(n-2);
					y=(x*l)%(n-2);
					z=((x-1)*l)%(n-2);
					if (y>z){
						if (y>=i && z<i)cout<<"-";
						else cout<<"+";
					}
					else{
						if (y>=i || z<i)cout<<"-";
						else cout<<"+";
					}
				}
				cout<<"\n";
			}
			for (int i=1;i<=2;i++){
				for (int j=1;j<=m;j++){
					cout<<"-";
				}
				cout<<"\n";
			}
			return;
		}
		else{
			cout<<n+m-3<<"\n";
			for (int i=1;i<=n;i++){
				for (int j=1;j<=m;j++){
					if (i<=n-1 && j<=m-2){
						if ((i+j)%2==0)cout<<"+";
						else cout<<"-";
						continue;
					}
					if (j>m-2)cout<<"+";
					else cout<<"-";
				}
				cout<<"\n";
			}
			return;
		}	
	}
}
int main(){
	int t;
	cin>>t;
	while(t--){
		solve();
	}
}

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