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题解 | #链表中环的入口结点#

int maxProfit(int* prices, int pricesLen ) { //if(prices == NULL || si...

C

2022-02-17

0 284

题解 | #判断链表中是否有环#

#include <stdbool.h> bool hasCycle(struct ListNode* head ) { if(head == NULL) &...

C

2022-02-17

0 380

题解 | #链表中环的入口结点#

struct ListNode* EntryNodeOfLoop(struct ListNode* pHead ) { if (pHead == N...

C

2022-02-17

0 398

题解 | #对称的二叉树#

#include <stdbool.h> bool isSame(struct TreeNode* root1, struct TreeNode* root2) { if...

C

2022-02-17

0 394

题解 | #牛牛的字符菱形#

写一个题要会一类题。模子出来了，给任意n都可以用 #include <stdio.h> int main() { char ch; scanf("%c", &ch); ...

C

2022-02-16

138 4017

题解 | #近三个月未完成试卷数为0的用户完成情况#

select uid, count(start_time) as exam_complete_cnt from ( select *, &nbs...

2022-02-13

0 316

题解 | #每份试卷每月作答数和截止当月的作答总数。#

select distinct exam_id, date_format(start_time, '%Y%m') as start_month, &nbs...

Mysql

2022-02-13

0 278

题解 | #统计有未完成状态的试卷的未完成数和未完成率#

select exam_id, sum(if(submit_time is null, 1, 0)) as incomplete_cn...

Mysql

2022-02-13

0 371

题解 | #0级用户高难度试卷的平均用时和平均得分#

select ui.uid, round(avg(if(submit_time is null, 0, score)), 0) as a...

Mysql

2022-02-13

0 349

题解 | #试卷发布当天作答人数和平均分#

select exam_id, count(distinct uid) as uv, round(avg(score), 1) as&...

Mysql

2022-02-13

0 335