Birthday Candles..wrong answer..please help

Can someone please tell me what is wrong with this code? It works fine for all the test cases in the example shown..Thanks in advance

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
   int t,a[10],min,k,j,val;
   cin>>t;
   while(t)
    { 
      for(int i=0;i<10;i++)
         cin>>a[i];
      min=a[0];
      k=0;
      for(j=1;j<10;j++)
        {
            if(a[j]<min)
               { min=a[j];
                 k=j;
               }
        }
      if(min!=0)
        val=(k*pow(10,min))+k;
      else
        val=(k*pow(10,min));
      if(val==0)
       {
           min=a[1];
           k=1;
           for(j=2;j<10;j++)
            {
              if(a[j]<min)
               { min=a[j];
                 k=j;
               }
            }
        val=k*pow(10,min);
       }
       cout<<val<<endl;
       t--;

    };

   return 0;
}