Daffodil International University
Problem Link
//Please follow from main function
#include<bits/stdc++.h>
using namespace std;
vector<int>data;
int main()
{
int n,sum=0, k;
cin>>k;
for(int i=0; i<k; i++){
cin>>n;
data.push_back(n);
sum+=n;
}
sort(data.begin(), data.end());
for(int i=1; i<k; i++){
if(data[i]<=data[i-1]){
data[i]=data[i-1] + 1;
}
}
for(int i=0; i<k; i++) sum-=data[i];
cout<<-sum<<endl;
return 0;
}
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