Submission #911029

#	Time	Username	Problem	Language	Result	Execution time	Memory
911029		penguin133	Red-blue table (IZhO19_stones)	C++17	54 / 100	26 ms	1880 KiB

stones

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

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

void solve(){
	int n, m; cin >> n >> m;
	int ext = (min(n, m) - 1) / 2 * max(n, m);
	int req = (min(n, m) - 1) / 2;
	int ned = max(n, m) / 2 + 1;
	cout << max(n, m) + ext / ned << '\n';
	int cnt[n+1] = {0}, cnt2[m+1] = {0};
	if(n > m){
		char A[n+1][m+1];
		for(int i=1;i<=m;i++){
			if(i%2){
				for(int j=1;j<=n;j++){
					if(cnt[j] < req && cnt2[i] < ned){
						A[j][i] = '-';
						cnt[j]++; cnt2[i]++;
					}
					else A[j][i] = '+';
				}
			}
			else{
				for(int j=n;j>=1;j--){
					if(cnt[j] < req && cnt2[i] < ned){
						A[j][i] = '-';
						cnt[j]++; cnt2[i]++;
					}
					else A[j][i] = '+';
				}
			}
		}
		for(int i=1;i<=n;i++){
			for(int j=1;j<=m;j++)cout << A[i][j];
			cout << '\n';
		}
	}
	else{
		for(int i=1;i<=n;i++){
			if(i%2)for(int j=1;j<=m;j++){
				if(cnt[i] < ned && cnt2[j] < req){
					cout << '+';
					cnt[i]++; cnt2[j]++;
				}
				else cout << '-';
			}
			else{
				stack <char> s;
				for(int j=m;j>=1;j--){
					if(cnt[i] < ned && cnt2[j] < req){
						s.push('+');
						cnt[i]++; cnt2[j]++;
					}
					else s.push('-');
				}
				while(!s.empty())cout << s.top(), s.pop();
			}
			cout << '\n';
		}
	}
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

stones.cpp:73:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   73 | main(){
      | ^~~~

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