Submission #586435

#	Time	Username	Problem	Language	Result	Execution time	Memory
586435		blue	Red-blue table (IZhO19_stones)	C++17	100 / 100	23 ms	2352 KiB

stones

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

using vi = vector<int>;
using vvi = vector<vi>;

vi ct;

int main()
{
	int T;
	cin >> T;

	for(int t = 1; t <= T; t++)
	{
		int N, M;
		cin >> N >> M;

		int A = 0, B = 0;

		// cerr << "1\n";

		if(N > M)
		{
			A = N;
		}
		else
			B = M;

		for(int a = 1; a <= N; a++)
		{
			for(int b = 1; b <= M; b++)
			{
				int redperrow = M/2 + 1;
				int lostcols = M - b;

				int remred = max(0, redperrow - lostcols);

				int totalred = remred * a;

				int z = totalred/b + bool(totalred % b);

				// cerr << a << ' ' << b << " : " << redperrow << ' ' << lostcols << "\n";

				if(z < N - z)
				{
					if(a+b > A+B)
					{
						A = a;
						B = b;
					}
				}
			}
		}
		// cerr << "2\n";

		// cout << A << ' ' << B << '\n';

		cout << A+B << '\n';

		vector<string> res(N, string(M, '-'));

		int redperrow = M/2 + 1;

		ct = vi(M, 0);

		for(int a = 0; a < A; a++)
		{
			for(int x = 0; x < min(M - B, redperrow); x++)
			{
				res[a][x] = '+';
			}

			int rem = redperrow - min(M - B, redperrow);

			vi I;
			for(int j = M - B; j < M; j++)
				I.push_back(j);

			sort(I.begin(), I.end(), [] (int u, int v)
			{
				return ct[u] < ct[v];
			});

			for(int q = 0; q < rem; q++)
			{
				ct[I[q]]++;
				res[a][I[q]] = '+';
			}
		}

		for(int i = 0; i < N; i++)
			cout << res[i] << '\n';
	}
}

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