Given an array nums (which may contain repeated values) and a target, return the index of the target's last (rightmost) occurrence, or -1 if it does not appear. This is the mirror image of finding the first occurrence. Scanning from the left, you only know a match is the last one after reaching the end; reversing the scanReverse IterationLooping from the last index down to the first, e.g. for (i = n − 1; i >= 0; i--). lets the search stop at the first match it meets.