Submission #1251202

#	Time	Username	Problem	Language	Result	Execution time	Memory
1251202		antonn	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	146 ms	80132 KiB

joi2019_ho_t1

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

template<typename T>
bool assign_min(T& a, T b) {
	if (a > b) {
		a = b;
		return true;
	}
	return false;
}

template<typename T>
bool assign_max(T& a, T b) {
	if (a < b) {
		a = b;
		return true;
	}
	return false;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, m;
    cin >> n >> m;
    vector<vector<char>> a(n + 2, vector<char>(m + 2));
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cin >> a[i][j];
        }
    }
    vector<vector<int>> down(n + 2, vector<int>(m + 2));
    vector<vector<int>> right(n + 2, vector<int>(m + 2));
    for (int i = n; i >= 1; i--) {
        for (int j = m; j >= 1; j--) {
            down[i][j] = down[i + 1][j] + (a[i][j] == 'I');
            right[i][j] = right[i][j + 1] + (a[i][j] == 'O');
        }
    }
    ll ans = 0;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            if (a[i][j] == 'J') {
                ans += (ll) down[i][j] * right[i][j];
            }
        }
    }
    cout << ans << "\n";
}

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