"Fun", "conceptually easy" and "very prone to off-by-one or other trivial errors" is basically a description of 99% of the problems on LeetCode. The last one i

"Fun", "conceptually easy" and "very prone to off-by-one or other trivial errors" is basically a description of 99% of the problems on LeetCode. The last one is particularly annoying because most problems could be easily tweaked with e.g. restrictions on the size of input or test cases to avoid those issues.