제출 #1280429

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1280429		jackofall718	Mountains (NOI20_mountains)	C++20	0 / 100	2095 ms	5184 KiB

Mountains

#include <bits/stdc++.h>
#include <chrono>
#define ll long long int
#define endl '\n'
#define vn vector<ll>
#define vi vector<pair <ll,ll>>

using namespace std;
using namespace std::chrono;
const int MAX_N = 1e9 + 7;
#define pii pair<ll,ll>
const ll INF = 0x3f3f3f3f3f3f3f3f;

#define pb push_back  
#define srt(vp) sort(vp.begin(), vp.end()) 

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

    auto start = high_resolution_clock::now();


    ll n;
    cin>>n;
    vn v(n);
    for (auto&x:v)cin>>x;
    ll ans = 0;
    vn a;
    vn b = v;
    a.pb(v[0]);
    b.erase(b.begin());
    for (int i=1;i<n-1;i++){
        a.pb(v[i]);
        sort(a.begin(),a.end());
        auto it = lower_bound(a.begin(),a.end(),v[i]);
        ll num1 = it - a.begin();
        
        auto it2 = lower_bound(b.begin(),b.end(),v[i]);
        ll num2 = it2-b.begin();
        
        ans += num2*num1;
       auto it3 = find(b.begin(),b.end(),v[i]);
       b.erase(it3);//gpt for syntax
    }
    cout<<ans<<endl;


    

    auto stop = high_resolution_clock::now();
    auto duration = duration_cast<microseconds>(stop - start);
    //cout << "Time taken by function: " << duration.count() << " microseconds" << endl;

    return 0;
}

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