Description
https://leetcode.com/problems/to-lower-case/
Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.
Example 1:
Input: "Hello" Output: "hello"
Example 2:
Input: "here" Output: "here"
Example 3:
Input: "LOVELY" Output: "lovely"
Explanation
Keep track of the existing sum.
Python Solution
class Solution:
def toLowerCase(self, str: str) -> str:
result = ""
for ch in str:
if ord(ch) > ord('z') or ord(ch) < ord('A'):
result += ch
elif ord(ch) - ord('a') < 0:
result += chr(ord(ch) - ord('A') + ord('a'))
else:
result += ch
return result- Time Complexity: O(N).
- Space Complexity: O(N).