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 <= 50jewelsandstonesconsist of only English letters.- All the characters of
jewelsare unique.
from collections import Counter
class Solution:
def numJewelsInStones(self, jewels: str, stones: str) -> int:
# s_col = Counter(stones)
# s = set(jewels)
# count = 0
# for j in s:
# if j in s_col:
# count+= s_col[j]
# return count
j_set = set(jewels)
count = 0
for s in stones:
if s in j_set:
count+=1
return count