题目

image.png

思路

  • 注意分界条件

    代码

    1.   public String reverseStr(String s, int k) {
    2.      char[] a = s.toCharArray();
    3.       for (int start = 0; start < a.length; start += 2 * k) {
    4.           int i = start, j = Math.min(start + k - 1, a.length - 1);
    5.           while (i < j) {
    6.               char tmp = a[i];
    7.               a[i++] = a[j];
    8.               a[j--] = tmp;
    9.           }
    10.       }
    11.       return new String(a);
    12.   }
    反转字符串 II