제출 #1281978

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1281978		cheska	Mountains (NOI20_mountains)	C++20	2 / 100	112 ms	16856 KiB

Mountains

#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define ppii pair<pii, pii> 
#define tiii tuple<int, int, int>
#define g0 get<0>
#define g1 get<1>
#define g2 get<2>
#define f first
#define s second
#define pb push_back
const int N = 5005;
const int MOD = 1e9+7;
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> 

signed main() {
   // freopen("in.in", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n; cin >> n;
    map<int, vector<int>> a;
    for (int i = 0; i < n; i++) {
        int j; cin >> j;
        a[j].pb(i);
    }
    ordered_set ss;
    int ans = 0;
    for (auto i : a) {
        for (int j : i.s) {
            int k = ss.order_of_key(j);
            ans += k*(ss.size()-k);
        }
        for (int j : i.s) {
            ss.insert(j);
        }
    }
    cout << ans;
}

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