[LeetCode] Best Time to Buy and Sell Stock II

문제

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 (i.e., buy one and sell one share of the stock multiple times).

Note: You may not engage in multiple transactions at the same time (i.e., you must sell the stock before you buy again).

Example 1:

Input: [7,1,5,3,6,4] Output: 7 Explanation: Buy on day 2 (price = 1) and sell on day 3 (price = 5), profit = 5-1 = 4.   Then buy on day 4 (price = 3) and sell on day 5 (price = 6), profit = 6-3 = 3.

Example 2:

Input: [1,2,3,4,5] Output: 4 Explanation: Buy on day 1 (price = 1) and sell on day 5 (price = 5), profit = 5-1 = 4.   Note that you cannot buy on day 1, buy on day 2 and sell them later, as you are   engaging multiple transactions at the same time. You must sell before buying again.

Example 3:

Input: [7,6,4,3,1] Output: 0 Explanation: In this case, no transaction is done, i.e. max profit = 0.

 

Approach

최대 이득은 이득이 다음날 조금이라도 생겼을때마다 팔고 사는 것을 더했을때와 같다.

 

Code

https://github.com/chi3236/algorithm/blob/master/LeetCode_BestTimeToBuyAndSellStockII.cpp

chi3236/algorithm