541. 反转字符串2 Reverse String II
Given a string and an integer k, you need to reverse the first k characters for every 2k characters counting from the start of the string. If there are less 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 left the other as original.
Input: s = "abcdefg", k = 2 Output: "bacdfeg"
Restrictions:
- The string consists of lower English letters only.
- Length of the given string and k will in the range [1, 10000]
public class Solution { public string ReverseStr(string s, int k) { char[] cArr = s.ToArray(); for (int left = 0; left < cArr.Length; left += 2 * k) { for (int i = left, j = Math.Min(left + k - 1, cArr.Length - 1); i < j; i++, j--) { char tmp = cArr[i]; cArr[i] = cArr[j]; cArr[j] = tmp; } } return new string(cArr); } }
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