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 (ie, buy one and sell one share of the stock), design an algorithm to find the maximum profit. 题意:…

题意:给定一个序列,第i个元素代表第i天这支股票的价格,问在最佳时机买入和卖出能赚多少钱?只买一次,且仅1股,假设本钱无限. 思路:要找一个最低价的时候买入,在最高价的时候卖出利润会最大.但是时间是不能冲突的,比如说在明天买入,今天卖出.因此,对于今天的价格,应该要找到今天之前的该股的最低价,买入,今天卖出. 其实就是要为序列中的一个元素A[k],找到另一个元素A[e],位置满足e<k,结果使得A[k]-A[e]最大. 用动态规划解决,从左扫起,遇到一个元素就更新当前最小值,再用当前元素去减这个…

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 transaction (ie, buy one and sell one share of the stock), design an algorithm to find the maximum profit. 这道题相…

网址:https://leetcode.com/problems/Best-Time-to-Buy-and-Sell-Stock/ 第一想法是滑动窗口法,稍微尝试后发现不可行,至少我不会... 而后想到动态规划,进一步思考发现完全可行: index 0 1 2 3 4 5 price[] 7 1 5 3 6 4 dp[] 0 0 4 2 5 3 price[index-1] - dp[index-1] 0 0 1 1 1 1 状态:dp[i] 表示prices[]从 0 到 i 这部分的最大利润…

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 transaction (ie, buy one and sell one share of the stock), design an algorithm to find the maximum profit. Exam…

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 transaction (ie, buy one and sell one share of the stock), design an algorithm to find the maximum profit. Have…

一 ［抄题］: If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock), design an algorithm to find the maximum profit. Input: [7, 1, 5, 3, 6, 4] Output: 5 max. difference = 6-1 = 5 (not 7-1 = 6, as selli…

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 as many transactions as you like (ie, buy one and sell one share of the stock multiple times) wit…

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 as many transactions as you like (ie, buy one and sell one share of the stock multiple times). Ho…

LeetCode:Best Time to Buy and Sell Stock 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 transaction (ie, buy one and sell one share of the stock), design an a…

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 k transactions. Note:You may not engage in multiple transactions at the same time (ie, yo…

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 (ie,…

Best Time to Buy and Sell Stock II 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 as many transactions as you like (ie, buy one and sell one sha…

原题链接在这里:https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iv/ 题目: 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 k transacti…

Your are given an array of integers prices, for which the i-th element is the price of a given stock on day i; and a non-negative integer fee representing a transaction fee. You may complete as many transactions as you like, but you need to pay the t…

先看一道leetcode题: Best Time to Buy and Sell Stock II 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 as many transactions as you like (ie, buy one a…

问题: 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 as many transactions as you like (ie, buy one and sell one share of the stock multiple times)…

将Best Time to Buy and Sell Stock的如下思路用到此题目 思路1:第i天买入,能赚到的最大利润是多少呢?就是i + 1 ~ n天中最大的股价减去第i天的. 思路2:第i天买出,能赚到的最大利润是多少呢?就是第i天的价格减去 0~ i-1天中最小的. 和前两道题比起来的话,这道题最难了,因为限制了交易次数.解决问题的途径我想出来的是:既然最多只能完成两笔交易,而且交易之间没有重叠,那么就divide and conquer.设i从0到n-1,那么针对每一个i,看看在pr…

一个系列三道题,我都不会做,google之答案.过了两道,第三道看不懂,放置,稍后继续. 一.Best Time to Buy and Sell Stock I 题目:一个数组表示一支股票的价格变换.要求只买卖一次,获得最大收益. 思路:一开始我认为是寻找最大.最小值,但由于最大值不一定总是出现在最小值的后面,因此WA. 参考思路:DP.对第i个价格,减去前i-1个价格中的最小值(保证该收益是在第i个价格卖出的最大收益),其收益与之前获得的最大收益相比. 代码: public int maxPr…

[称号] 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…

1. Best Time to Buy and Sell Stock 2. Best Time to Buy and Sell Stock II 3. Best Time to Buy and Sell Stock III 4. Best Time to Buy and Sell Stock IV 5. Best Time to Buy and Sell Stock with Cooldown 6. Best Time to Buy and Sell Stock with Transaction…

Best Time to Buy and Sell Stock IIIQuestion SolutionSay 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 en…

Best Time to Buy and Sell Stock IIQuestion SolutionSay 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 as many transactions as you like (ie, buy one…

Best Time to Buy and Sell Stock 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 transaction (ie, buy one and sell one share of the stock), design an algorithm…

Question: Best Time to Buy and Sell Stock 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 transaction (ie, buy one and sell one share of the stock), design an…

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 two transactions. Note: You may not engage in multiple transactions at the same time (ie…

原题链接在这里:https://leetcode.com/problems/best-time-to-buy-and-sell-stock-with-cooldown/ 题目: 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 as many…

原题链接在这里:https://leetcode.com/problems/best-time-to-buy-and-sell-stock-with-transaction-fee/description/ 题目: Your are given an array of integers prices, for which the i-th element is the price of a given stock on day i; and a non-negative integer fee …

问题: 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 transaction (ie, buy one and sell one share of the stock), design an algorithm to find the maximum profit.…

原题地址:https://oj.leetcode.com/problems/best-time-to-buy-and-sell-stock-iii/ 题意: 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 transa…