The assertion i < 0 || values[i] <= values[i + 1]; is intended to verify that the subarray values[0..j] is sorted after every iteration of the outer loop. This means that the assertion should be placed after the insertion of the element tmp into its correct position. Hence, the correct place to insert the assertion is after line 10, where the element tmp has been placed in its correct position, ensuring that values[0..j] is sorted.