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全部文章 / 题解（共155篇）

题解 | #记录点赞用户#

public class Main { public static void main(String[] args) { LikeRecorder recorder = new LikeRecorderImpl(); Scanner scanner = n...

Java

2022-01-07

0 306

题解 | #友元全局函数#

using namespace std; class Person { // write your code here...... friend void showAge(Person &); public: Person(int age...

C++

2022-01-06

0 343

题解 | #截取出年龄#

select #sql中subString_index的嵌套使用的用法 SUBSTRING_INDEX(SUBSTRING_INDEX(profile,',',3),',',-1) as age, count(device_id) as NUMBER from user_s...

Mysql

2022-01-06

0 282

题解 | #统计每种性别的人数#

#sql中分割字符串的方法 select SUBSTRING_INDEX(profile,',',-1) as gender, COUNT(device_id) as NUMBER from user_submit group by gender;

Mysql

2022-01-05

0 347

题解 | #计算25岁以上和以下的用户数量#

select ( case when age>=25 then '25岁及以上' else '25岁以下' end) as age_cut, count(device_id) as number...

Mysql

2022-01-05

0 350

题解 | #栈的压入、弹出序列#

public: bool IsPopOrder(vector<int> pushV,vector<int> popV) { bool flag=true; stack<int> test; int i; ...

C++

2022-01-04

0 307

题解 | #去除字符串中重复的字符#

#include<set> // write your code here...... using namespace std; int main() { char str[100] = { 0 }; cin.getline(str, sizeof(str)); ...

C++

2022-01-02

0 318

题解 | #数组元素处理#

using namespace std; void func(int* p, int n); int main() { int arr[6] = { 0 }; for (int i = 0; i < 6; i++) { cin >> arr[i...

C++

2021-12-30

0 408

题解 | #数值的整数次方#

public: double Power(double base, int exponent) { double result=1; int i; //暴力法 if(exponent>0){ for...

C++

2021-12-30

0 333

题解 | #二叉树的深度#

struct TreeNode { int val; struct TreeNode *left; struct TreeNode *right; TreeNode(int x) : val(x), left(NULL), right(NULL) { } };*/ class Sol...

C++

2021-12-30

0 290