제출 #1036699

#제출 시각아이디문제언어결과실행 시간메모리
1036699andrewpBitaro the Brave (JOI19_ho_t1)C++14
100 / 100
143 ms89532 KiB
//Dedicated to my love, ivaziva
#include <bits/stdc++.h>
using namespace std;

using pii = pair<int, int>;
using ll = int64_t;

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define dbg(x) cerr << #x << ": " << x << '\n';

int32_t main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
	cerr.tie(nullptr);

	int n, m;
	cin >> n >> m;
	vector<string> a(n);
	for (int i = 0; i < n; i++) cin >> a[i];
	vector<vector<int> > ps1(n, vector<int>(m, 0)), ps2(n, vector<int>(m, 0));
	for (int i = 0; i < n; i++) {
		ps1[i][m - 1] = (a[i].back() == 'O');
		for (int j = m - 2; j >= 0; j--) {
			ps1[i][j] = ps1[i][j + 1] + (a[i][j] == 'O');
		}
	}
	for (int j = 0; j < m; j++) {
		ps2[0][j] = (a[0][j] == 'J' ? ps1[0][j] : 0);
		for (int i = 1; i < n; i++) {
			ps2[i][j] = ps2[i - 1][j] + (a[i][j] == 'J' ? ps1[i][j] : 0);
		}
	}
	ll ans = 0;
	for (int i = 1; i < n; i++) {
		for (int j = 0; j < m; j++) {
			ans += (a[i][j] == 'I' ? ps2[i - 1][j] : 0);
		}
	}
	cout << ans << '\n';
}
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