Submission #887578

#	Time	Username	Problem	Language	Result	Execution time	Memory
887578		Perl32	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	236 ms	160464 KiB

joi2019_ho_t1

// I wrote this code 4 u <3
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) 42
#endif

signed main(int32_t argc, char *argv[]) {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m;
    cin >> n >> m;
    vector<string> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    vector<vector<ll>> prefX(m + 1, vector<ll>(n)), prefY(n + 1, vector<ll>(m));
    for (int i = n - 1; i > -1; --i) {
        for (int j = m - 1; j > -1; --j) {
            prefX[j][i] = prefX[j + 1][i] + (a[i][j] == 'O');
            prefY[i][j] = prefY[i + 1][j] + (a[i][j] == 'I');
        }
    }
    ll ans = 0;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            if (a[i][j] == 'J') {
                ans += prefX[j + 1][i] * prefY[i + 1][j];
            }
        }
    }
    cout << ans;
}

/*

 */

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