Index of first 1 in a sorted array of 0s and 1s.cpp

//{ Driver Code Starts
#include <bits/stdc++.h>
using namespace std;

// } Driver Code Ends
class Solution{
    public:
    int firstIndex(int a[], int n) 
    {
        // Your code goes here
        for(int i=0;i<n;i++){
            if(a[i]==1)
                return i;
        }
        return -1;
    }
};

//{ Driver Code Starts.
int main() {

    int t;
    cin >> t;

    while (t--) {
        int n;
        cin >> n;
        int a[n];

        for (int i = 0; i < n; i++) cin >> a[i];
        Solution ob;
        cout << ob.firstIndex(a, n) << endl;
    }
}
// } Driver Code Ends