Submission #720965

#	Time	Username	Problem	Language	Result	Execution time	Memory
720965		Pring	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	326 ms	184084 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;

#define int long long
typedef pair<int, int> pii;

const int MXN = 5005;
int n, m, O[MXN][MXN], I[MXN][MXN], ans;
string s[MXN];
char c[MXN][MXN];

void GO() {
    for (int i = 0; i < n; i++) {
        for (int j = m - 2; j >= 0; j--) {
            O[i][j] = O[i][j + 1];
            if (s[i][j + 1] == 'O') O[i][j]++;
        }
    }
}

void GI() {
    for (int j = 0; j < m; j++) {
        for (int i = n - 2; i >= 0; i--) {
            I[i][j] = I[i + 1][j];
            if (s[i + 1][j] == 'I') I[i][j]++;
        }
    }
}

int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m;
    for (int i = 0; i < n; i++) cin >> s[i];
    GO();
    GI();
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (s[i][j] != 'J') continue;
            ans += O[i][j] * I[i][j];
        }
    }
    cout << ans << endl;
    return 0;
}

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