Submission #963329

#	Time	Username	Problem	Language	Result	Execution time	Memory
963329		efishel	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	65 ms	9292 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector <ll>;

int main () {
    cin.tie(nullptr) -> sync_with_stdio(false);
    ll n, m;
    cin >> n >> m;
    vll dp(m, 0);
    ll ans = 0;
    for (ll i = 0; i < n; i++) {
        string str;
        cin >> str;
        ll acc = 0;
        for (ll j = m-1; j >= 0; j--) {
            switch (str[j]) {
                case 'J':
                dp[j] += acc;
                break;
                case 'O':
                acc++;
                break;
                case 'I':
                ans += dp[j];
                break;
            }
        }
    }
    cout << ans << '\n';
    return 0;
}

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