Create 387_First_Unique_Character_in_a_String.md

Author: koji

387_First_Unique_Character_in_a_String.md

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+## 387. First Unique Character in a String
+
+
+Given a string, find the first non-repeating character in it and return its index. If it doesn't exist, return -1.
+
+Examples:
+
+s = "leetcode"
+return 0.
+
+s = "loveleetcode"
+return 2.
+
+
+
+```python
+def firstUniqChar(self, s: str) -> int:
+ dic = Counter(s)
+ for k, v in dic.items():
+ if v == 1:
+ return s.index(k)
+ return -1
+```
+
+
+```
+Runtime: 52 ms, faster than 98.59% of Python3 online submissions for First Unique Character in a String.
+Memory Usage: 14.2 MB, less than 100.00% of Python3 online submissions for First Unique Character in a String.
+```