Submission #364239

#	Time	Username	Problem	Language	Result	Execution time	Memory
364239		Rainbowbunny	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	240 ms	88684 KiB

joi2019_ho_t1

#include <iostream>
#include <queue>
#include <algorithm>
#include <utility>
#include <vector>

int h, w;
char board[3005][3005];
int countorb[3005][3005], countingot[3005][3005];

int main()
{
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(0);
	std::cout.tie(0);
	std::cin >> h >> w;
	for(int i = 1; i <= h; i++)
	{
		for(int j = 1; j <= w; j++)
		{
			std::cin >> board[i][j];
			countorb[i][j] = countorb[i][j - 1] + (board[i][j] == 'O');
			countingot[i][j] = countingot[i - 1][j] + (board[i][j] == 'I');
		}
	}
	long long ans = 0;
	for(int i = 1; i <= h; i++)
	{
		for(int j = 1; j <= w; j++)
		{
			if(board[i][j] == 'J')
			{
				ans += 1ll * (countorb[i][w] - countorb[i][j]) * (countingot[h][j] - countingot[i][j]);
			}
		}
	}
	std::cout << ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50