Submission #712786

#	Time	Username	Problem	Language	Result	Execution time	Memory
712786		Angus_Yeung	Bitaro the Brave (JOI19_ho_t1)	C++11	100 / 100	312 ms	159268 KiB

joi2019_ho_t1

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

ll n, m, ans, si[3010][3010], so[3010][3010];
char a[3010][3010];

int main() {
	cin.tie(0); cout.tie(0);
	ios::sync_with_stdio(0);
	
	cin >> n >> m;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			cin >> a[i][j];
			if (a[i][j] == 'O') {
				so[i][j]++;
			}
			else if (a[i][j] == 'I') {
				si[i][j]++;
			}
			so[i][j] += so[i][j-1];
			si[i][j] += si[i-1][j];
		}
	}
	
	ans = 0;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			if (a[i][j] == 'J') {
				ans += (so[i][m]-so[i][j])*(si[n][j]-si[i][j]);
			}
		}
	}
	cout << ans << "\n";
	
	return 0;
}

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