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  • [LeetCode] 188. Best Time to Buy and Sell Stock IV2020-09-20 07:02:14

    Say you have an array for which the i-th element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete at most k transactions. Note:You may not engage in multiple transactions at the same time (ie, you m

  • [LeetCode] 123. Best Time to Buy and Sell Stock III2020-09-20 04:01:10

    Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete at most two transactions. Note: You may not engage in multiple transactions at the same time (i.e.,

  • 0121. Best Time to Buy and Sell Stock (E)2020-09-18 17:00:21

    Best Time to Buy and Sell Stock (E) 题目 Say you have an array for which the \(i^{th}\) element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (i.e., buy one and sell one share of the stock), design

  • 188. Best Time to Buy and Sell Stock IV2020-09-13 16:31:39

    参考:团灭股票问题 问题: 股票问题: 给出一组一支股票每日的价格数组。prices[] 每一天的操作可以为:买buy,卖sell,不操作rest 一次交易从buy开始,若限制在K次交易以内,求可获得的最大收益是多少。 解法:DP(动态规划) 1.确定【状态】: 当前的天数:第 i 天 当前经过的交易次数:第 k 次 当前的

  • leetcode 29:best-time-to-buy-and-sell-stock-ii2020-08-07 16:00:16

    题目描述 假设你有一个数组,其中第i个元素表示某只股票在第i天的价格。 设计一个算法来寻找最大的利润。你可以完成任意数量的交易(例如,多次购买和出售股票的一股)。但是,你不能同时进行多个交易(即,你必须在再次购买之前卖出之前买的股票)。 Say you have an array for whi

  • spring boot:用redis+redisson实现分布式锁(redisson3.11.1/spring boot 2.2)2020-06-16 13:05:17

    一,为什么要使用分布式锁?  如果在并发时锁定代码的执行,java中用synchronized锁保证了线程的原子性和可见性 但java锁只在单机上有效,如果是多台服务器上的并发访问,则需要使用分布式锁, 例如:两台机器上同时各有一个进程查询同一件商品的库存,此时商品库存数为1, 数据库给两台机器返

  • buy a ticket2020-05-27 14:02:54

    题目 Musicians of a popular band "Flayer" have announced that they are going to "make their exit" with a world tour. Of course, they will visit Berland as well. There are n cities in Berland. People can travel between cities using two-di

  • Buy a Ticket2020-05-26 21:54:54

    分析 暴力做法是从每个点开始跑最短路,显然会T。 进一步优化的话是将边权乘2,这样就不用跑回来了。 但是还是不行,那么有没有办法可以跑一次最短路就解决了呢。 开一个超级源点就行了。 这样从这个点开始跑,一次Dij后得到的就是答案。 #include<queue> #include<cstdio> #include<cstr

  • Buy a Ticket,题解2020-05-26 19:06:03

    题目连接 题意:   没个位置有一个点权,每个边有一个边权,求对于每个点u的min(2*d(u,v)+val[v])(v可以等于u) 分析:   我们想这样一个问题,从u到v的边权*2再加一个点权就完了,我们能不能把点权也变成边权,可以,直接和0连接就好了,这是从u到0的最短路(当然原先的边权要*2)就是要

  • 数据传递与数据回传2020-05-12 20:57:22

    1.按照图(1)布局编写第一个Activity,点击按钮后跳转到第二个Activity并将选择的结果数据一起传递过去。 2.按照图(2)编写第二个Activity,显示第一个Activity传递的数据内容,点击按钮后跳转到第三个Activity。 3.按照图(3)编写第三个Activity,用ListView实现列表展示信息,点击列表某行信

  • 刷题309. Best Time to Buy and Sell Stock with Cooldown2020-04-19 12:59:09

    一、题目说明 题目309. Best Time to Buy and Sell Stock with Cooldown,计算买卖股票的最大利润,卖出股票后第二天不能买入,需要冷却一天。 二、我的解答 这个题目,我没做出来。看了高手的解答,才知道用dp。 class Solution{ public: //sold[i] = hold[i-1] + price[i]; //hold[i

  • 122. 买卖股票的最佳时机 II2020-04-01 19:07:28

    1 /* 2 [7, 1, 5, 6] 第二天买入,第四天卖出,收益最大(6-1),所以一般人可能会想,怎么判断不是第三天就卖出了呢? 3 这里就把问题复杂化了,根据题目的意思,当天卖出以后,当天还可以买入,所以其实可以第三天卖出,第三天买入,第四天又卖出((5-1)+ (6-5) === 6 - 1)。 4 所以算法可以直接简化为只

  • [CF938D] Buy a Ticket - 最短路,建图2020-03-28 14:08:22

    在 \(n\) 个城市开演唱会,这 \(n\) 个城市的人都想去听演唱会,每个城市的票价不同,于是这些人就想是否能去其他城市听演唱会更便宜(去回都要路费) Solution 设演唱会为 \(0\) 号点 连边 \(0 \to i\),对于一对可达的城市,连边 \(u \leftrightarrow v\) 跑最短路即可 #include <bits/stdc++

  • LeetCode | 0188. Best Time to Buy and Sell Stock IV买卖股票的最佳时机 IV【Python】2020-03-11 23:01:34

    LeetCode 0188. Best Time to Buy and Sell Stock IV买卖股票的最佳时机 IV【Hard】【Python】【动态规划】 Problem LeetCode Say you have an array for which the i-th element is the price of a given stock on day i. Design an algorithm to find the maximum profit. Yo

  • LeetCode | 0309. Best Time to Buy and Sell Stock with Cooldown最佳买卖股票时机含冷冻期【Python】2020-03-11 20:51:25

    LeetCode 0309. Best Time to Buy and Sell Stock with Cooldown最佳买卖股票时机含冷冻期【Medium】【Python】【动态规划】 Problem LeetCode Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the max

  • o2o优惠券预测--经验分享(三)2020-03-08 09:44:16

    今日分感谢大神们 下面我们直接上代码 def GetUserMerchantRelateInfo(feature): #4.user_merchant: #times_user_buy_merchant_before. feature3 = feature all_user_merchant = feature3[['user_id','merchant_id']] all_user_merchant.drop_duplic

  • LeetCode练题——122. Best Time to Buy and Sell Stock II2020-03-03 12:01:44

    1、题目   给定一个数组,它的第 i 个元素是一支给定股票第 i 天的价格。   设计一个算法来计算你所能获取的最大利润。你可以尽可能地完成更多的交易(多次买卖一支股票)。   注意:你不能同时参与多笔交易(你必须在再次购买前出售掉之前的股票)。   示例 1:   输入: [7,1,5,3,6,4]

  • aced六类股票问题2020-02-22 15:01:52

    一.状态转移框架   在我们刷题的过程中,很多同学肯定会遇到股票问题这类题目,股票问题有很多种类型,大多数同学都知道要用动态规划去做,但是往往写不对状态转移方程,我刚接触这类问题时也是一头雾水,但是掌握了问题的关键点之后,这类问题就可以迎刃而解了,在此我分享一个方法可以解决所

  • LeetCode | 0122. Best Time to Buy and Sell Stock II买卖股票的最佳时机 II【Python】2020-02-20 09:50:58

    LeetCode 0122. Best Time to Buy and Sell Stock II买卖股票的最佳时机 II【Easy】【Python】【贪心】 Problem LeetCode Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may

  • LeetCode | 0121. Best Time to Buy and Sell Stock买卖股票的最佳时机【Python】2020-02-19 23:04:24

    LeetCode 0121. Best Time to Buy and Sell Stock买卖股票的最佳时机【Easy】【Python】【贪心】 Problem LeetCode Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transactio

  • PAT Advanced 1092 To Buy or Not to Buy (20分)2020-01-25 15:51:07

    Eva would like to make a string of beads with her favorite colors so she went to a small shop to buy some beads. There were many colorful strings of beads. However the owner of the shop would only sell the strings in whole pieces. Hence Eva must check whe

  • ANT 的long和short操作2020-01-15 15:42:40

    证券市场中Long被称为多头,实际上是一种操作的结果,即证券的持有,buy Long 即为买入此证券。 Short称为空头,即并不拥有此证券所以是short。只有先借来才能sell,然后buy回short。 ant的操作不用borrow这个行为即可以操作双向的Long和short Short 和Long实际上是针对是否手中持有

  • Buy xtool x100 pad2 or obdstar tool?2019-12-31 19:52:14

    xtool x100 pad2 or obdstar tool (x300 pro3 and obdstar DP plus). Which one has better coverage and support? How come obdstar products are more popular and has frequent updates but xtool products are slow in updates and least popular? Here are the answers:

  • Codeforces Round #610 (Div. 2) B2. K for the Price of One (Hard Version) (DP)2019-12-25 20:57:08

    链接: https://codeforces.com/contest/1282/problem/B2 题意: This is the hard version of this problem. The only difference is the constraint on k — the number of gifts in the offer. In this version: 2≤k≤n. Vasya came to the store to buy goods for his friends f

  • php设计模式--门面模式2019-12-19 15:02:56

    优势:松耦合,屏蔽组件。依赖分层 class ali { function buy(){ echo "买入阿里<br/>"; } function sell(){ echo "卖出阿里<br>"; } } class hds { function buy(){ echo "买入x德森<br/>"; }

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