55. 右旋字符串(卡玛网)
题目链接:55. 右旋字符串(第八期模拟笔试)
代码:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n = Integer.parseInt(in.nextLine());
String s = in.nextLine();
int len = s.length(); //获取字符串长度
char[] chars = s.toCharArray();
reverseString(chars, 0, len - 1); //反转整个字符串
reverseString(chars, 0, n - 1); //反转前一段字符串,此时的字符串首尾尾是0,n - 1
reverseString(chars, n, len - 1); //反转后一段字符串,此时的字符串首尾尾是n,len - 1
System.out.println(chars);
}
public static void reverseString(char[] ch, int start, int end) {
//异或法反转字符串,参照题目 344.反转字符串的解释
while (start < end) {