You're given strings jewels
representing the types of stones that are jewels, and stones
representing the stones you have. Each character in stones
is a type of stone you have. You want to know how many of the stones you have are also jewels.
Letters are case sensitive, so "a"
is considered a different type of stone from "A"
.
Example 1:
Input: jewels = "aA", stones = "aAAbbbb"
Output: 3
Example 2:
Input: jewels = "z", stones = "ZZ"
Output: 0
Constraints:
-
1 <= jewels.length, stones.length <= 50
-
jewels
andstones
consist of only English letters. - All the characters of
jewels
are unique.
SOLUTION:
class Solution:
def numJewelsInStones(self, jewels: str, stones: str) -> int:
jewels = set(jewels)
return len([c for c in stones if c in jewels])
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