Hackerearth: COUNT NUMBERS

code:

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int t,n,i,a;
    string s;
    cin>>t;

    while(t--)
    {
        int c=0;
        cin>>n;
        cin>>s;
        for(i=0; i<=n; i++)
        {
            if(s[i]>=48 && s[i]<=57)
            {
                a++;  //this is increasing when a digit is found
            }
            else
            {
                if(a!=0)
                {
                    c++; //must check this logic
                }
                a=0;    //must check this logic
            }

        }
        cout<<c<<endl; //printing how many numbers are here
    }



    return 0;
}