Submission #1127794

#	Time	Username	Problem	Language	Result	Execution time	Memory
1127794		tsengang	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	176 ms	10328 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define ll long long
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(), x.end()
#define vodka void
#define ertunt return
using namespace std;
int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    ll h, w;
    cin >> h >> w;
    vector<string> s(h);
    vector<ll> J(h + 5,0), O(h + 5,0), I(w + 5,0);
    for (ll i = 0; i < h; i++) {
        cin >> s[i];
        for (ll j = 0; j < w; j++) {
            if (s[i][j] == 'O') O[i]++;
        }
    }
    for (ll i = 0; i < w; i++) {
        for (ll j = 0; j < h; j++) {
            if (s[j][i] == 'I') I[i]++;
        }
    }
    ll ans = 0;
    for (ll i = 0; i < h; i++) {
        for (ll j = 0; j < w; j++) {
            if (s[i][j] == 'J') {
                ans+=I[j]*O[i];
            }
            if (s[i][j] == 'O') O[i]--;
            if (s[i][j] == 'I') I[j]--;
        }
    }
    cout << ans;
}

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