Submission #853968

#	Time	Username	Problem	Language	Result	Execution time	Memory
853968		parsadox2	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	153 ms	88660 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

const int N = 3e3 + 2;
int h , w , dpo[N][N] , dpi[N][N];
char c[N][N];

signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);  cout.tie(0);
	cin >> h >> w;
	for(int i = 0 ; i < h ; i++)  for(int j = 0 ; j < w ; j++)
		cin >> c[i][j];
	long long ans = 0;
	for(int i = h - 1 ; i >= 0 ; i--)  for(int j = w - 1 ; j >= 0 ; j--)
	{
		dpi[i][j] = (i == h - 1 ? 0 : dpi[i + 1][j]);
		if(c[i][j] == 'I')
			dpi[i][j]++;
		dpo[i][j] = (j == w - 1 ? 0 : dpo[i][j + 1]);
		if(c[i][j] == 'O')
			dpo[i][j]++;
		if(c[i][j] == 'J')
			ans += dpi[i][j] * dpo[i][j];
	}
	cout << ans << '\n';
	return 0;
}

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