제출 #887871

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
887871		adaawf	Mountains (NOI20_mountains)	C++14	22 / 100	477 ms	41176 KiB

Mountains

#include <iostream>
using namespace std;
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
namespace __gnu_pbds{
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
}
using namespace __gnu_pbds;
long long int a[300005], f[300005], g[300005];
int main() {
    long long int n, res = 0;
    cin >> n;
    ordered_set s, t;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        f[i] = s.order_of_key(a[i]);
        s.insert(a[i]);
    }
    for (int i = n; i >= 1; i--) {
        g[i] = t.order_of_key(a[i]);
        t.insert(a[i]);
        res += f[i] * g[i];
    }
    cout << res;
}

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