int* printNumbers(int n, int* returnSize){
    int i ;
    int f = 1;
    int* ret;
    for(i = 0; i< n ;++i){
        f *= 10;
    }
    --f; 
    *returnSize = f;
    ret = (int *) malloc(f * sizeof(int));
    for(i = 1 ; i<=f ;++i){
        ret[i -1] =i ;
    }
    return ret;
    
}