Submission #1280441

#	Time	Username	Problem	Language	Result	Execution time	Memory
1280441		jackofall718	Mountains (NOI20_mountains)	C++20	64 / 100	2095 ms	2624 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;
     

    

    for (int i = 2; i < n; i++) {
        ll num1 = 0, num2 = 0;
        for (int j = 1;j<i;j++){
            if (v[j]<v[i])num1++;

        }
        for (int j=i+1;j<=n;j++){
            if (v[j]<v[i])num2++;
        }
        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;
}

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 9
• Subtask 4: 36 / 36
• Subtask 5: 28 / 28
• Subtask 6: 0 / 9
• Subtask 7: 0 / 12