CF22A

#include "iostream"
#include "cstring"
#include "cstdio"
#include "algorithm"
using namespace std;
int a[105],n;
int main()
{
  cin>>n;
  for(int i=1;i<=n;i++)cin>>a[i];
  unique(a+1,a+1+n);
  sort(a+1,a+unique(a+1,a+1+n)+1);
  if(unique(a+1,a+1+n)<2){
    cout<<"NO";
    return 0;
  }
  cout<<a[2];
}

话说为什么总是CE