java codility Frog-River-One

100/100

public static int solution (int X, int[] A){

    int[]counter = new int[X+1];
    int ans = -1;
    int x = 0;

    for (int i=0; i<A.length; i++){
        if (counter[A[i]] == 0){
            counter[A[i]] = A[i];
            x += 1;
            if (x == X){
                return i;
            }
        } 
    }

    return ans;
}

Here is my solution. It got me 100/100:

public int solution(int X, int[] A)
{
     int[] B = A.Distinct().ToArray();
     return (B.Length != X) ? -1 : Array.IndexOf<int>(A, B[B.Length - 1]);
}

You are using arrayList.contains inside a loop, which will traverse the whole list unnecessarily.

Here is my solution (I wrote it some time ago, but I believe it scores 100/100):

    public int frog(int X, int[] A) {
        int steps = X;
        boolean[] bitmap = new boolean[steps+1];
        for(int i = 0; i < A.length; i++){
            if(!bitmap[A[i]]){
                bitmap[A[i]] = true;
                steps--;
                if(steps == 0) return i;
            }

        }
        return -1;
    }