declaring 2-d array dynamically

[shoonya]

void foo(char *str){
...
int arr[strlen(set)][strlen(set)];
..
}

certainly we can't do this in C.
So how to implement this thing in C.
Need help urgently

[weaknessforcats]

Use malloc(). That will allocate the array on the heap.

Be sure to free() the array when you are finished.