Submission #620802

#	Time	Username	Problem	Language	Result	Execution time	Memory
620802		berr	Diversity (CEOI21_diversity)	C++17	64 / 100	47 ms	7800 KiB

diversity

#include <bits/stdc++.h>
using namespace std;
#define int long long

int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    
    vector<int> a(300005, 0);
    int n, q; cin>>n>>q;

    for(int i=0; i<n; i++)
    {
        int x; cin>>x;
        a[x]++;
    }

    sort(a.begin(), a.end());
    int ans=0;
    vector<int> b, c;
    for(int i=0; i<a.size(); i++)
    {
        if(a[i]>0)
        {
            if(i%2) b.push_back(a[i]);
            else c.push_back(a[i]);
        }
    }
    int l, r; cin>>l>>r;


    reverse(c.begin(), c.end());
    for(auto i: c) b.push_back(i);

    int sum=0, all=0;
    for(int i=0; i<b.size(); i++)
    {
        sum+=all;
        ans+=sum*b[i]+(b[i]*(b[i]+1))/2;
        all+=b[i];
        sum+=b[i];
    }

    cout<<ans;
}

Compilation message (stderr)

diversity.cpp: In function 'int32_t main()':
diversity.cpp:21:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(int i=0; i<a.size(); i++)
      |                  ~^~~~~~~~~
diversity.cpp:36:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for(int i=0; i<b.size(); i++)
      |                  ~^~~~~~~~~

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