2d Array in Spiral Order

Question

I\'m trying to fill an array in spiral order. So far, I can print the array in spiral order, but is there a way to modify the array so that i can fill it in spiral order and

Answer 1

If you've figured out code to do the reads (for printing), then surely you can just modify that to do writes instead, using the same logic?

If you want each cell in the matrix to contain its "sequential number", counting backwards, something like this ought to work, assuming your access logic is correct:

for (int i = (m*n)-1, j = 0, index = m * n; i > 0; i--, j++) {
      for (int k = j; k < i; k++) values[j][j] = index--;
      for (int k = j; k < i; k++) values[k][i] = index--;
      for (int k = i; k > j; k--) values[i][k] = index--;
      for (int k = i; k > j; k--) values[k][j] = index--;
}