import java.util.Scanner; public class Main { //时间复杂度 O(n) public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while (scanner.hasNext()) { String str = scanner.next(); //直接排除 if ("".equals(str.trim())) { System.out.println(str); } //双指针 逆序 char[] chars = str.toCharArray(); int s = 0, e = chars.length - 1; while (s < e) { char tmp = chars[s]; chars[s] = chars[e]; chars[e] = tmp; s++; e--; } System.out.println(chars); } } }
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