[LeetCode] Valid Number

Link : Valid Number

Validate if a given string is numeric. Some examples: "0" => true " 0.1 " => true "abc" => false "1 a" => false "2e10" => true Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before implementing one.

Analysis:
Test case is quite important.
To make clear what if input is NULL, '\0', or "    "(only space).
exponential part is quite important.

I tried several times, and there is always some case that I didn't expect.
This is intentionally a vague problem. So ask for details from interviewers, if possible.

[LeetCode] Trapping Rain Water

Link : Trapping Rain Water

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6. The above elevation map is represented by array [0,1,0,2,1,0,1,3,2,1,2,1]. In this case, 6 units of rain water (blue section) are being trapped. Thanks Marcos for contributing this image!

Hi GEEKs, bored with LeetCode? Look at this!

The beauty of combination, Math & Algorithm

http://projecteuler.net/