Radix Sort Algorithm

Question

I have been given some algorithms to reverse engineer. The algorithm below is a radix sort, but I am very confused about what is actually happening in the code.

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Answer 1

/*try this iterative method and 100% working*/
    #include
    #include
    int sort();
    int display();
    long int a[20],n;
    int main(){
    int i;
    printf("enter the size:");
    scanf("%d",&n);
    printf("\nenter the array elements\n");
          for(i=0;i