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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. using namespace std;
  4. ll c[1000003],k,x,ma;
  5. int main()
  6. {
  7.     ll n,i;
  8.     cin>>n;
  9.     for(i=1;i<=n;i++)
  10.     {
  11.         cin>>x;
  12.         k=sqrt(x);
  13.         ma=max(ma,k);
  14.         if(k*k==x) c[k]=1;
  15.     }
  16.     for(i=0;i<=ma+1;i++)
  17.     if(c[i]==0)
  18.     {
  19.         cout<<i*i;
  20.         break;
  21.     }
  22. }
  23.  
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/TpI6rf
language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

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