Submission #766989

#	Time	Username	Problem	Language	Result	Execution time	Memory
766989		Tenis0206	Exercise Deadlines (CCO20_day1problem2)	C++11	17 / 25	1073 ms	12572 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int nmax = 2e5;

int n;
int v[nmax + 5];

int poz[nmax + 5];

set<int,greater<int>> s;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>v[i];
        s.insert(i);
    }
    for(int i=n;i>=1;i--)
    {
        auto it = s.lower_bound(v[i]);
        if(it==s.end())
        {
            cout<<-1<<'\n';
            return 0;
        }
        poz[i] = *it;
        s.erase(it);
    }
    int rez = 0;
    for(int i=1;i<=n;i++)
    {
        for(int j=i+1;j<=n;j++)
        {
            if(poz[i] > poz[j])
            {
                ++rez;
            }
        }
    }
    cout<<rez<<'\n';
    return 0;
}

• Subtask 1: 17 / 17
• Subtask 2: 0 / 8