Submission #237797

#	Time	Username	Problem	Language	Result	Execution time	Memory
237797		dCoding	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	304 ms	86776 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

#define ll long long int
#define pll pair<ll, ll>
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define F0R(i, n) for(auto i = 0; i < (n); i++)
#define FOR(i, a, b) for(auto i = (a); i <= (b); i++)
#define ROF(i, a, b) for(auto i = (a); i >= (b); i--)

using namespace std;

int main()
{
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	int n, m; cin >> n >> m;
	string a[n]; F0R(i, n) cin >> a[i];
	int preo[n + 5][m + 5], prei[n + 5][m + 5];
	memset(preo, 0, sizeof(preo));
	memset(prei, 0, sizeof(prei));
	F0R(i, n) {
		ROF(j, m - 1, 0) {
			preo[i][j] = preo[i][j + 1] + (a[i][j] == 'O');
		}
	}
	F0R(j, m) {
		ROF(i, n - 1, 0) {
			prei[i][j] = prei[i + 1][j] + (a[i][j] == 'I');
		}
	}
	ll ans = 0;
	F0R(i, n) {
		F0R(j, m) {
			if(a[i][j] == 'J') {
				ans += prei[i][j] * preo[i][j];
			}
		}
	}
	cout << ans;
}

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