标签:fit following com turn amp neu sha sel value
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) with the following restrictions:
Example:
prices = [1, 2, 3, 0, 2] maxProfit = 3 transactions = [buy, sell, cooldown, buy, sell]
此题有点偏难,先上代码:
public class Solution {
public int maxProfit(int[] prices) {
int pre_buy = 0;
int pre_sell = 0;
int buy = Integer.MIN_VALUE;
int sell = 0;
for(int i=0;i<prices.length;i++){
pre_buy = buy;
buy = Math.max(pre_buy,pre_sell-prices[i]);
pre_sell = sell;
sell = Math.max(pre_sell,pre_buy+prices[i]);
}
return sell;
}
理由如下:
buy[i] = Math.max(buy[i-1],sell[i-2]-prices[i]);
sell[i] = Math.max(sell[i-1],buy[i-1]+prices[i]);
其中,sell[i-2]-prices[i]里面,i-1操作为cooldown的时间,就有了如上的代码。
309. Best Time to Buy and Sell Stock with Cooldown
标签:fit following com turn amp neu sha sel value
原文地址:http://www.cnblogs.com/codeskiller/p/6358742.html