Submission #159382

#	Time	Username	Problem	Language	Result	Execution time	Memory
159382		iefnah06	Bitaro the Brave (JOI19_ho_t1)	C++11	100 / 100	144 ms	88716 KiB

joi2019_ho_t1

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

using ll = long long;

const int MAXH = 3010;
const int MAXW = 3010;
int H, W;
char G[MAXH][MAXW];

int sumO[MAXH][MAXW];
int sumI[MAXH][MAXW];

int main() {
	ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	cin >> H >> W;
	for (int i = 0; i < H; i++) {
		cin >> G[i];
	}
	for (int i = 0; i < H; i++) {
		for (int j = 0; j < W; j++) {
			sumO[i][j+1] = sumO[i][j] + (G[i][j] == 'O');
		}
	}
	for (int i = 0; i < H; i++) {
		for (int j = 0; j < W; j++) {
			sumI[i+1][j] = sumI[i][j] + (G[i][j] == 'I');
		}
	}
	ll ans = 0;
	for (int i = 0; i < H; i++) {
		for (int j = 0; j < W; j++) {
			if (G[i][j] == 'J') {
				ans += (sumO[i][W] - sumO[i][j]) * (sumI[H][j] - sumI[i][j]);
			}
		}
	}
	cout << ans << '\n';

	return 0;
}

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