Submission #1129494

#	Time	Username	Problem	Language	Result	Execution time	Memory
1129494		Nomio	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	169 ms	80520 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int H, W;
	cin >> H >> W;
	string s[H];
	int cnto[H][W] {}, cnti[H][W] {}; 
	for(int i = 0; i < H; i++) {
		cin >> s[i];
		for(int j = 0; j < W; j++) {
			if(j != 0) cnto[i][j] = cnto[i][j - 1];
			if(i != 0) cnti[i][j] = cnti[i - 1][j];
			if(s[i][j] == 'O') cnto[i][j]++;
			else if(s[i][j] == 'I') cnti[i][j]++;
		}
	}
	ll ans = 0;
	for(int i = 0; i < H; i++) {
		for(int j = 0; j < W; j++) {
			if(s[i][j] == 'J') {
				ans += 1LL * (cnto[i][W - 1] - cnto[i][j]) * (cnti[H - 1][j] - cnti[i][j]);
			}
		}
	}
	cout << ans << '\n';
	return 0;
}

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