제출 #1137021

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1137021		TheInvadr	Mountains (NOI20_mountains)	C++20	0 / 100	262 ms	15668 KiB

Mountains

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#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template<class T> using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;

int main()
{
    int n;
    cin>>n;
    int arr[n];
    ordered_multiset<int> left;
    ordered_multiset<int> right;
    for(int i =0;i<n;i++){
        cin>>arr[i];
        right.insert(arr[i]);
    }
    int cnt = 0;
    for(int i =0;i<n;i++){
        int l = left.order_of_key(arr[i]);
        int r = right.order_of_key(arr[i]);
        cnt+=l*r;
        left.insert(arr[i]);
        right.erase(right.find_by_order(right.order_of_key(arr[i])));
    }
    cout<<cnt;
}

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