第二题的java版本 import java.util.Scanner; public class Main {     public static void main(String[] args) {         Scanner in = new Scanner(System.in);         int n = in.nextInt();         int k = in.nextInt();         System.out.println(core(n, k));     }     public static int core(int n, int k) {         int count = 0;         if(k == 0){             return n*n;         }         for (int y = k + 1; y <= n; y++) {             int i = n/y;             count += i*(y-k);             if(n%y >=k){                 count += n%y -k +1;             }         }         return count;     } }