Submission #1370677

#TimeUsernameProblemLanguageResultExecution timeMemory
1370677Ekber_EkberBitaro the Brave (JOI19_ho_t1)C++20
100 / 100
187 ms151412 KiB
#include <bits/stdc++.h>
// #ifndef ONLINE_JUDGE
//     #include <debug.h>
// #else
//     #define debug(...)
// #endif
#define GOOD_LUCK ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define int long long
#define endl "\n"
#define ff first
#define ss second
#define pb push_back
#define all(v) v.begin(), v.end()
using namespace std;

constexpr int MAX = 2e+5 + 1, INF = 2e+16, MOD = 1e+9 + 7, K = 31;

void _() {
    int n, m;
    cin >> n >> m;
    vector <string> v(n);
    for (auto &i : v) cin >> i;
    vector <vector <int>> co(n, vector <int>(m, 0)), ci(n, vector <int>(m, 0));
    for (int i = 0; i < n; i++){
        for (int j = 0; j < m; j++) {
            if (v[i][j] == 'O') co[i][j] = 1;
            if (v[i][j] == 'I') ci[i][j] = 1;
        }
    }
    for (int i = 0; i < n; i++) {
        for (int j = m - 2; j >= 0; j--) {
            co[i][j] += co[i][j + 1];
        }
    }
    for (int j = 0; j < m; j++) {
        for (int i = n - 2; i >= 0; i--) {
            ci[i][j] += ci[i+1][j];
        }
    }
    int res = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (v[i][j] == 'J') res += ci[i][j] * co[i][j];
        }
    }
    cout << res;
}

signed main() {

    GOOD_LUCK

    int tests=1;
    // cin >> tests;
    for (int i=1; i <= tests; i++) {
        _();
        cout << endl;
    }

    return 0;
}
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