mybatis判断集合为空或者元素个数为零: <if test="mlhs != null and mlhs.size() != 0"> and t.mlh_name not in <foreach collection="mlhs" item="item1" open="(" close=")" index="i" separator=",">
import java.util.Scanner; public class Dayin_100 { public static void main(String[] args) { System.out.println("请输入需要打印整数的第一个数:"); Scanner San1 = new Scanner(System.in); System.out.println("请输入需要打印整数的尾数:"); Scanner San = new Scanner(Sy
这周Java课程有个小作业:Java递归实现从n个数中选取m个数的所有组合 代码如下: //其中 n 取 1,2,3,4,5 五个数, m 取 3 package javaText; public class text { static int N = 5; static int M = 3; static int[] a= new int[]{1,2,3,4,5}; static int[] b = new int[M]; public static void main(String[] ar
求集合里元素的个数 输出最大的个数是多少 Sample Input41 23 45 61 641 23 45 67 8 Sample Output42 # include <iostream> # include <cstdio> # include <cstring> # include <algorithm> # include <cmath> # include <queue> # define LL long long usi
day11 --------------------------------------------------------------- 实例018:复读机相加 题目 求s=a+aa+aaa+aaaa+aa-a的值,其中a是一个数字.例如2+22+222+2222+22222(此时共有5个数相加),几个数相加由键盘控制. 分析:很简单,字符串*x可以复制. 1 a = input('请输入数字:') 2 n = input("请输入要加几次:") 3 s = 0 4 for i in
D - Disjoint Set of Common Divisors Problem Statement Given are positive integers AA and BB. Let us choose some number of positive common divisors of AA and BB. Here, any two of the chosen divisors must be coprime. At most, how many divisors can we c