Formatted question description:

709. To Lower Case (Easy)

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"

Solution 1.

// OJ:

// Time: O(N)
// Space: O(1)
class Solution {
    string toLowerCase(string str) {
        for (char &c : str) c = tolower(c);
        return str;

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