Geeksforgeeks Solution For " Adding One "

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Problem :- Adding One

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Solution :- 

#include <iostream>
using namespace std;
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        int i,carry=1,n,sum=0;
        cin>>n;
        int arr[n];
        
        for(i=0;i<n;i++)
        cin>>arr[i];
        for(i=n-1;i>=0;i--)
        {
            sum=carry+arr[i];
            arr[i]=sum%10;
            carry=sum/10;
        }
        if(carry>0)
        cout<<carry<<" ";
        for(i=0;i<n;i++)
        cout<<arr[i]<<" ";
        cout<<endl;
    }
    return 0;
}

Output:-