Submission #991159

#	Time	Username	Problem	Language	Result	Execution time	Memory
991159		aaaaaarroz	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	73 ms	88968 KiB

joi2019_ho_t1

    #include<bits/stdc++.h>
    using namespace std;
    using ll = long long;
    const int N = 3030;
    char c[N][N];
    int qs[2][N][N];
    int main() {
        cin.tie(nullptr)->sync_with_stdio(false);
        int n, m;
        cin >> n >> m;
        for (int i = 1;i <= n;i++) {
            cin >> (c[i] + 1);
            for (int j = 1;j <= m;j++) {
                qs[0][i][j] = qs[0][i][j - 1] + (c[i][j] == 'O');
                qs[1][i][j] = qs[1][i - 1][j] + (c[i][j] == 'I');
            }
        }
        ll ans = 0;
        for (int i = 1;i < n;i++) {
            for (int j = 1;j < m;j++) {
                if (c[i][j] == 'J') {
                    ans += 1ll * (qs[0][i][m] - qs[0][i][j]) * (qs[1][n][j] - qs[1][i][j]);
                }
            }
        }
        cout << ans;
        return 0;
    }

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