lower case Archives - Huahua's Tech Road https://zxi.mytechroad.com/blog/tag/lower-case/ Tue, 04 Sep 2018 08:51:14 +0000 en hourly 1 https://wordpress.org/?v=6.0.8 https://zxi.mytechroad.com/blog/wp-content/uploads/2017/09/cropped-photo-32x32.jpg lower case Archives - Huahua's Tech Road https://zxi.mytechroad.com/blog/tag/lower-case/ 32 32 花花酱 LeetCode 709. To Lower Case https://zxi.mytechroad.com/blog/string/leetcode-709-to-lower-case/ https://zxi.mytechroad.com/blog/string/leetcode-709-to-lower-case/#respond Thu, 12 Jul 2018 15:09:18 +0000 http://zxi.mytechroad.com/blog/?p=3086 Problem Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase. Solution Time complexity: O(n) Space complexity: O(1) [crayon-663a1fcfe98c9653345786/]…

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]]> Problem

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

Solution

Time complexity: O(n)

Space complexity: O(1)

C++

// Author: Huahua
// Running time: 0 ms
class Solution {
public:
  string toLowerCase(string str) {
    for (char &c : str)
      if (c >= 'A' && c <= 'Z') c = c - 'A' + 'a';
    return str;
  }
};

Java

// Author: Huahua, 1 ms
class Solution {
  public String toLowerCase(String str) {
    char[] s = str.toCharArray();
    for (int i = 0; i < s.length; ++i)
      if (s[i] >= 'A' && s[i] <= 'Z') s[i] = (char)(s[i] - 'A' + 'a');
    return new String(s);
  }
}

Python3

# Author: Huahua, 40 ms
class Solution:
  def toLowerCase(self, str):
    ans = ''
    for c in str:
      if c >= 'A' and c <= 'Z':
        ans += chr(ord(c) + 32)
      else:
        ans += c
    return ans

Python3 1-linear

# Author: Huahua, 68 ms
class Solution:
  def toLowerCase(self, str):
    return ''.join(chr(ord(c) + 32) if c >= 'A' and c <= 'Z' else c for c in str)

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