Submission #984962

#	Time	Username	Problem	Language	Result	Execution time	Memory
984962		alexdd	Diversity (CEOI21_diversity)	C++17	4 / 100	12 ms	2904 KiB

diversity

#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int n,q;
int a[300005];
int fr[300005];
signed main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>q;
    int mxm=0;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        fr[a[i]]++;
        mxm=max(mxm,a[i]);
    }
    int qle,qri;
    for(int i=1;i<=q;i++)
    {
        cin>>qle>>qri;
    }
    sort(fr+1,fr+1+mxm);
    vector<int> vle,vri;
    for(int i=1;i+1<=mxm;i+=2)
    {
        if(i%2==1)
        {
            vle.push_back(fr[i]);
            vri.push_back(fr[i+1]);
        }
        else
        {
            vle.push_back(fr[i+1]);
            vri.push_back(fr[i]);
        }
    }
    if(mxm%2==1) vle.push_back(fr[mxm]);
    vector<int> aux = vle;
    for(int i=(int)vri.size()-1;i>=0;i--)
        aux.push_back(vri[i]);
    long long pref=0,rez=0;
    for(auto x:aux)
    {
        rez += (pref+x)*(n-pref);
        rez -= x*(x-1)/2;
        pref += x;
    }
    cout<<rez;
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 16
• Subtask 5: 0 / 26
• Subtask 6: 0 / 36