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coding
Easy
hash map
#1
1. [Hash Map] — Find the first unique character in a string
1. Background: In Salesforce, managing customer data efficiently is crucial. Analyzing data input, such as user feedback, often involves finding unique entries among repeated instances. This problem helps with such analysis.
2. Problem statement: You are given a string
3. Function/class signature:
-
4. Example 1:
- Input:
- Output:
- Explanation: The character 's' is the first unique character in the string.
5. Example 2:
- Input:
- Output:
- Explanation: There are no unique characters in the string.
6. Constraints:
-
-
2. Problem statement: You are given a string
s representing some customer feedback. Your task is to find the first unique character in this string and return its index. If there are no unique characters, return -1.3. Function/class signature:
-
def first_unique_char(s: str) -> int:4. Example 1:
- Input:
"salesforce" - Output:
0 - Explanation: The character 's' is the first unique character in the string.
5. Example 2:
- Input:
"aabbcc" - Output:
-1 - Explanation: There are no unique characters in the string.
6. Constraints:
-
1 <= len(s) <= 1000 -
s consists only of lowercase English letters.Start practicing Salesforce questions
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