122. Best Time to Buy and Sell Stock II
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leetcode 122
Say you have an array for which the ith element is the price of a given stock on dayi.
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). However, you may not engage in multiple transactions at the same time (ie, you must sell the stock before you buy again).
题意:一个数组中的第i个元素表示在第i天的股票价格。你可以完成任意次交易,但必须保证最多拥有一支股票,即在买入股票之前已经将股票卖出。求最大收益。
解题思路:股票的每天价格可以画成一条折线图,题意即求每个单调增区间的上升值的和。
class Solution {public: int maxProfit(vector<int>& prices) {if(prices.size()<=1)return 0; int maxP=0;//记录最大收益for(int i=1;i<prices.size();i++){int temp=prices[i]-prices[i-1];if(temp>0)maxP=maxP+temp;}return maxP; }};
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