pythonOff-by-oneMedium

Range check excludes its own lower bound

Time: 0:00

What it should do

count_in_range(nums, low, high) counts values between low and high INCLUSIVE, so count_in_range([1,2,3], 1, 3) returns 3.

What goes wrong

count_in_range([1,2,3], 1, 3) returns 2 instead of 3 — a value exactly equal to low is not counted, although one equal to high is.

Hints

This is an off-by-one errors bug

The loop that runs one time too many, the slice that drops the last item, the index that starts in the wrong place.