Jewels and Stones
Description
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(javascript)
/**
* @param {string} jewels
* @param {string} stones
* @return {number}
*/
var numJewelsInStones = function(jewels, stones) {
const hash = {}
let count = 0
for (let char of jewels) {
hash[char] = true
}
for (let char of stones) {
if (hash[char]) {
count++
}
}
return count;
};