39: Jewels and stones
Given two strings: jewels
and stones
. Each character in jewels
it's a unique type of jewels. stones
are the stones what you have. Find out how many of your stones
are jewels
Example 1
Input: jewels = "aBb", stones = "cBbbA"
Output: 3
Example 2
Input: jewels = "abc", stones = "ABC"
Output: 0