• Java for LeetCode 040 Combination Sum II

    时间:2024-01-06 23:24:37

    Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.Each numb...

  • oracle对sum出来的数字进行非空补0处理

    时间:2024-01-05 22:16:40

    oracle在使用函数计算式会遇到这样的情况:例如sum函数如果计算的sum值为null,则用0替代方法1(便于理解):select when sum(c.num) is null then  0  else    sum(t.num) from class c方法2(简单粗暴):NVL(Expr1

  • 聚合函数 -AVG/MAX/MIN/STDDEV/VARIANCE/SUM/COUNT/MEDIAN

    时间:2024-01-05 16:59:51

    ------------------------------------------聚合函数-----------------------------------------------1: AVG(DISTINCT|ALL)ALL表示对所有的值求平均值,DISTINCT只对不同的值求平均值SE...

  • jdk8 stream实现sql单表select a,b,sum(),avg(),max() from group by a,b order by a,b limit M offset N及其性能

    时间:2024-01-05 16:58:20

    之所以要测该场景,是因为merge多数据源结果的时候,有时候只是单个子查询结果了,而此时采用sql数据库处理并不一定能够合理(网络延迟太大)。测试数据10万行,结果1000行limit 20 offset 0的延时如下:package com.xxx.me.base.service;import c...

  • group by与avg(),max(),min(),sum()函数的关系

    时间:2024-01-05 16:37:38

    数据库表:create table pay_report(    rdate varchar(8),     --日期    region_id varchar(4),    --地市      alipay_pay varchar(12), --支付宝支付    wechat_pay varcha...

  • 聚合函数:sum,avg,max,min,count

    时间:2024-01-05 16:38:15

    group by  分组的使用方法数学函数:ABS、ceiling、floor、power、round、sqrt、square练习:...

  • codeforces 979D Kuro and GCD and XOR and SUM

    时间:2024-01-05 14:01:20

    题意:给出两种操作:1.添加一个数字x到数组。2.给出s,x,k,从数组中找出一个数v满足gcd(x,k) % v == 0 && x + v <= s && (x xor v 最大),如果没有,输出-1.思路:有两种做法。第一种,首先用若干个set存因子中有k...

  • [Leetcode 216]求给定和的数集合 Combination Sum III

    时间:2024-01-04 22:10:38

    【题目】Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should...

  • LeetCode Combination Sum III (DFS)

    时间:2024-01-04 22:04:19

    题意:在1~9这9个数字中选择k个出来,若他们的和为n,则加入答案序列,注意升序。思路:用DFS的方式,每次决定一个数字,共决策k次。假设上个决策是第i位为5,那么i+1位的范围就是6~9。 class Solution { public: vector<vector<int&g...

  • Leetcode之回溯法专题-216. 组合总和 III(Combination Sum III)

    时间:2024-01-04 22:02:03

    Leetcode之回溯法专题-216. 组合总和 III(Combination Sum III)同类题目:Leetcode之回溯法专题-39. 组合总数(Combination Sum)Leetcode之回溯法专题-40. 组合总和 II(Combination Sum II)找出所有相加之和为 ...

  • LeetCode OJ:Combination Sum (组合之和)

    时间:2024-01-04 21:40:07

    Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.The same repeate...

  • 【LeetCode】113. Path Sum II 解题报告(Python)

    时间:2024-01-04 21:34:29

    【LeetCode】113. Path Sum II 解题报告(Python)标签(空格分隔): LeetCode作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/题目地址:https://leetcode.com/problems/p...

  • [LeetCode] 39. Combination Sum 组合之和

    时间:2024-01-04 21:36:27

    Given a set of candidate numbers (candidates) (without duplicates) and a target number (target), find all unique combinations in candidates where the ...

  • [Leetcode] combination sum ii 组合之和

    时间:2024-01-04 21:29:52

    Given a collection of candidate numbers ( C ) and a target number ( T), find all unique combinations in C where the candidate numbers sums to T .Each ...

  • [LeetCode] 377. Combination Sum IV 组合之和之四

    时间:2024-01-04 21:24:30

    Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target....

  • 【LeetCode】364. Nested List Weight Sum II 解题报告 (C++)

    时间:2024-01-04 21:20:34

    作者: 负雪明烛id: fuxuemingzhu个人博客:http://fuxuemingzhu.cn/目录题目描述题目大意解题方法递归日期题目地址:https://leetcode-cn.com/problems/nested-list-weight-sum-ii/题目描述Given a nest...

  • LeetCode(40) Combination Sum II

    时间:2024-01-04 21:16:48

    题目Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.Each nu...

  • 【LeetCode】40. Combination Sum II 解题报告(Python & C++)

    时间:2024-01-04 21:09:09

    作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/目录题目描述题目大意解题方法方法一:DFS方法二:回溯法日期题目地址:https://leetcode.com/problems/combination-sum-ii/description...

  • [LeetCode] 377. Combination Sum IV 组合之和 IV

    时间:2024-01-04 21:10:19

    Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target....

  • [LeetCode] 40. Combination Sum II 组合之和 II

    时间:2024-01-04 21:05:32

    Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where the candidate numb...