easyStringTwo Pointers 0 views
Reverse String II
Given a string s and an integer k, reverse the first k characters for every 2k characters counting from the start of the string.
Given a string s and an integer k, reverse the first k characters for every 2k characters counting from the start of the string.
If there are fewer than k characters left, reverse all of them. If there are less than 2k but greater than or equal to k characters, then reverse the first k characters and leave the other as original.
Example 1
Input: s = "abcdefg", k = 2
Output: "bacdfeg"
Example 2
Input: s = "abcd", k = 2
Output: "bacd"
Constraints
- 1 <= s.length <= 10^4
- s consists of only lowercase English letters.
- 1 <= k <= 10^4
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