Submission #1262563

#	Time	Username	Problem	Language	Result	Execution time	Memory
1262563		sohamsen15	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	257 ms	150624 KiB

joi2019_ho_t1

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    ll h, w, ans = 0; cin >> h >> w;
    vector<vector<char>> a(h + 1, vector<char>(w + 1));

    for (ll i = 1; i <= h; i++) {
        string s; cin >> s;
        for (ll j = 1; j <= w; j++)
            a[i][j] = s[j - 1];
    }

    vector<vector<ll>> orbs(h + 1, vector<ll>(w + 1));
    for (ll i = 1; i <= h; i++) 
        for (ll j = 1; j <= w; j++)
            orbs[i][j] = orbs[i][j - 1] + (a[i][j] == 'O');
    
    vector<vector<ll>> ingots(h + 1, vector<ll>(w + 1));
    for (ll j = 1; j <= w; j++)
        for (ll i = 1; i <= h; i++) 
            ingots[i][j] = ingots[i - 1][j] + (a[i][j] == 'I');

    for (ll i = 1; i <= h; i++)
        for (ll j = 1; j <= w; j++)
            if (a[i][j] == 'J')
                ans += (orbs[i][w] - orbs[i][j]) * (ingots[h][j] - ingots[i][j]);

    cout << ans;
}

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