Sudoku Challenge Help

Question

So I have a working validator here:

https://code.sololearn.com/c95kvF53HSZ5/?ref=app

I want to be able to fill the grid with values from 1 to 9 randomly, pretty much each number will have a random location in the vector and will not repeat. I can't seem to get it working, my other attempts were in separate unsaved codes so I'd have to re-write to show you.

But how can I do it?

Answer 1

To start off, I haven't touched any C++ program in literal months, so my solution is probably as janky as it can be.

What I did was create 3 new variables - arr, c, and count. arr will be an array consisting of any numbers that have already been used, c will be a number set to random (from 1 - 9), and count will be a counter that allows arr to be populated with the values.

From there I changed up the inner for loop within fillGrid() function so that rather than having b be the number getting pushed to the vector c gets pushed instead (the while loop is used to make sure that the value of c is not repeated).
https://code.sololearn.com/c4iupx0FdnS3/?ref=app

Answer 2

Try using the rand() function.
Example in C -
  int i;
 // Use current time as 
  // seed for random generator
    srand(time(0));

    for (i = 0; i < count; i++) {
   int num = (rand() % (upper - lower + 1)) + lower;
   printf("%d ", num);
    }
// upper =10 lower =0 for Sudoku

Hope this helps...!!!