Submission #827022

#	Time	Username	Problem	Language	Result	Execution time	Memory
827022		amin	Diversity (CEOI21_diversity)	C++14	0 / 100	1 ms	280 KiB

diversity

#include <bits/stdc++.h>

using namespace std;

#define ll long long
int fre[300001];
int main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
ll n,q;
cin>>n>>q;
int a[n];
for(int i=0;i<n;i++)
{
    cin>>a[i];
    fre[a[i]]++;
}
vector<pair<int,int> >v;
for(int i=0;i<n;i++)
{
    if(fre[a[i]]==0)
    {
        continue;
    }
    v.push_back({fre[a[i]],a[i]});
    fre[a[i]]=0;
}
sort(v.begin(),v.end());

vector<pair<int,int > >s2;
vector<pair<int,int > >s1;
ll sz1=0,sz2=0;
ll k=v.size();
ll ans=n*(n+1)/2*k;
ll cursz=0;
for(int j=0;j<1000;j++)
{
    cursz=0;
for(int i=0;i<v.size()-1;i++)
{
ll newsz=cursz+v[i].first;
ll one=newsz*(newsz+1)/2+(n-newsz)*(n-newsz+1)/2;
newsz=v[i+1].first+cursz;
ll two=newsz*(newsz+1)/2+(n-newsz)*(n-newsz+1)/2;

if(two>one)
{
    swap(v[i],v[i+1]);
  //  cout<<one<<' '<<two<<endl;
}
    cursz+=v[i].first;
}
}
for(auto i:v)
{
 //   cout<<i.first<<' '<<i.second<<endl;
   // if(sz1<=sz2)
   // {
        ans-=sz1*(sz1+1)/2;

        ll j=n-sz1-i.first;

        ans-=j*(j+1)/2;
        s1.push_back(i);
        sz1+=i.first;
    //}else
   /* {
        ans+=sz2*(sz2+1)/2;
    ll j=n-sz2-i.first;
    ans-=j*(j+1)/2;
        s2.push_back(i);
        sz2+=i.first;
    }*/
}
reverse(s2.begin(),s2.end());
vector<int>b;

for(auto i:s1)
{
    while(i.first--)
    {
        b.push_back(i.second);
    }
}
for(auto i:s2)
{
    while(i.first--)
    {
        b.push_back(i.second);
    }
}

while(q--)
{
    int l,r;
    cin>>l>>r;
}
cout<<ans;

}

Compilation message (stderr)

diversity.cpp: In function 'int main()':
diversity.cpp:41:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 | for(int i=0;i<v.size()-1;i++)
      |             ~^~~~~~~~~~~
diversity.cpp:34:10: warning: unused variable 'sz2' [-Wunused-variable]
   34 | ll sz1=0,sz2=0;
      |          ^~~

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