Submission #1130295

#	Time	Username	Problem	Language	Result	Execution time	Memory
1130295		mingga	Bitaro the Brave (JOI19_ho_t1)	C++20	20 / 100	11 ms	8264 KiB

joi2019_ho_t1

#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
// #define int long long
const int MOD = 1e9 + 7;
const int inf = 2e9;
const int N = 3005;
int h, w, a[N][N], cnt[N][N][3];

signed main() {
	cin.tie(0) -> sync_with_stdio(0);
	cin >> h >> w;
	for(int i = 1; i <= h; i++) {
		for(int j = 1; j <= w; j++) {
			char c; cin >> c;
			if(c == 'I') {
				a[i][j] = 1;
				cnt[1][j][1]++;
				cnt[i][j][1]--;
			}
			else if(c == 'O') {
				a[i][j] = 2;
				cnt[i][1][2]++;
				cnt[i][j][2]--;
			}
		}
	}
	int ans = 0;
	for(int i = 1; i <= h; i++) {
		for(int j = 1; j <= w; j++) {
			cnt[i][j][1] = cnt[i - 1][j][1] + cnt[i][j][1];
			cnt[i][j][2] = cnt[i][j - 1][2] + cnt[i][j][2];
		}
	}
	for(int i = 1; i <= h; i++) {
		for(int j = 1; j <= w; j++) {
			if(a[i][j] == 0) {
				ans += cnt[i][j][2] * cnt[i][j][1];
			}
		}
	}
	cout << ans << ln;
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50