unique.student

int frequency(int[] a, int n) {
    int f = 0;
    for (int i = 0; i < a.length; i++) {
        if (a[i] == n) {
            f = f + 1;
        }
    }
    return f;
}

int findUniqueElems(int[] a, int[] b) {
    int nu = 0;
    for (int i = 0; i < a.length; i++) {
        if (frequency(a, a[i]) == 1) {
            b[nu] = a[i];
            nu = nu + 1;
        }
    }
    return nu;
}

void print(int[] a){
    for (int i = 0; i < a.length; i++) {
        System.out.print(a[i]+ " ");
    }
}
int[] copy(int[]a, int l){
    int[] r = new int[l];
    for(int i =0; i < l; i++){
        r[i] = a[i];
    }
    return r;
}

int[] unique(int[] a) {
    int[] b = new int[a.length];
    int nu= findUniqueElems(a,b);
    return copy(b,nu);
}
int[] a = {32,23,12,23,15,32};
//System.out.println(frequency(a,127));
print(unique(a));