제출 #1280440

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1280440		jackofall718	Mountains (NOI20_mountains)	C++20	13 / 100	34 ms	2796 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 ll INF = 0x3f3f3f3f3f3f3f;

#define pb push_back  
#define srt(vp) sort(vp.begin(), vp.end()) 
#define pii pair<ll,ll>

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

    auto start = high_resolution_clock::now();

    ll n;
    cin >> n;
    vn v(n+1);
    for (int i = 1; i <= n; i++) cin >> v[i];

    ll ans = 0;
    vn count(101,0);
    vn cnt(101,0);  

    for (int i = 1; i <= n; i++) count[v[i]]++;

    for (int i = 1; i <= n; i++) {
        ll num1 = 0, num2 = 0;
        for (int j = 0; j < v[i]; j++) {
            num1 += cnt[j];
            num2 += count[j] - cnt[j];
        }
        cnt[v[i]]++;
        ans += num1 * num2;
    }

    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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