Geeksforgeeks Solution For " Right most non zero digit "

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Problem :- Right most non zero digit

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Solution :- 

#include<iostream>
using namespace std;

int getFiveCount(long long* arr, int n){
    int fiveCount=0;
long long temp;
for(int i=0;i<n;i++){
   temp= arr[i];
   while(temp && !(temp%5)){
       fiveCount++;
       temp/=5;
   }
   arr[i]= temp;
    }
    return fiveCount;
}

long long eliminate2(long long* arr, int n, int fiveCount){
    long long temp;
    for(int i=0;i<n;i++){
  temp=arr[i];
  while(fiveCount && temp && !(temp&1)){
      temp>>=1;
      fiveCount--;
  }
  arr[i]=temp;
  if(!fiveCount)
      break;
    }
    return fiveCount;
}

int main()
 {
//code
int t,n;
long long arr[102];
cin >> t;
while(t--){
   cin >> n;
   for(int i=0;i<n;i++)
       cin >> arr[i];
   long long mod=1;
        int fiveCount= getFiveCount(arr,n);    
        int fiveRemains= eliminate2(arr,n,fiveCount);
        if(fiveRemains)
            mod=5;
        for(int i=0;i<n;i++)
            mod=(mod*(arr[i]%10))%10;
        if(mod==0)
            mod=-1;
        cout << mod <<endl;
}
return 0;
}

Output:-