🌵387. First Unique Character in a String
https://leetcode.com/problems/first-unique-character-in-a-string/
js
/**
* @param {string} s
* @return {number}
*/
var firstUniqChar = function(s) {
const map = {}
s.split('').forEach(c => {
map[c] = (map[c] || 0) + 1
})
for (let i = 0; i < s.length; i++) {
if (map[s[i]] === 1) {
return i
}
}
return -1
}py
class Solution:
def firstUniqChar(self, s):
"""
:type s: str
:rtype: int
"""
m = {}
for c in s:
m[c] = m.get(c, 0) + 1
for i in range(len(s)):
if m[s[i]] == 1:
return i
return -1