The code failed because the developer misused the post-increments in several loops.

When evaluating the expression i++, the interpreter post-increments the variable i after returning its original value.

When optimizing the loop, remember to post-increment the index after reading its current value.

The compiler optimizes the post-increment by deferring the actual increment until after the expression has been evaluated.

The function is post-incrementing the index each time it accesses the array to preserve the current value for the operation.

The counter variable was post-incremented when the function returned its previous value.