Submission #1122671

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122671		SulA	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	75 ms	10216 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
//#pragma GCC target("popcnt")
using namespace __gnu_pbds;
using namespace std;
using ordered_set = tree<int, null_type, less_equal<>, rb_tree_tag, tree_order_statistics_node_update>;
#define popcount __builtin_popcountll

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

    int n,m; cin >> n >> m;
    string a[n]; for (auto& s : a) cin >> s;
    long long ans = 0;
    int row[n]{}, col[m]{};
    for (int i = n-1; i >= 0; i--) {
        for (int j = m-1; j >= 0; j--) {
            if (a[i][j] == 'J')
                ans += row[i] * col[j];
            else if (a[i][j] == 'O')
                row[i]++;
            else
                col[j]++;
        }
    }
    cout << ans;
}

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