第一道题暴力AC了。。。 import java.util.Scanner; public class Main { public static int distance(char[] c1, char[] c2, int index) { int distance = 0; int count = c2.length; for (int i = 0; i < count; i++) { if (c1[i + index] != c2[i]) { distance++; } } return distance; } public static void main(String[] args) { Scanner in = new Scanner(System.in); char[] c1 = in.nextLine().toCharArray(); char[] c2 = in.nextLine().toCharArray(); int num = c1.length - c2.length+ 1; int total = 0; for (int i = 0; i < num; i++) { total += distance(c1,c2,i); } System.out.println(total); } }