链接: 买卖股票的最佳时机

题目描述

算法分析

程序代码

class Solution {
public:int maxProfit(vector<int>& prices) {int n = prices.size();vector<vector<int>> f(n,vector<int>(3,-0x3f3f3f));auto g = f;f[0][0] = -prices[0];g[0][0] = 0;for(int i = 1;i < n;++i){for(int j = 0;j < 3;++j){f[i][j] = max(f[i-1][j],g[i-1][j]-prices[i]);g[i][j] = g[i-1][j];if(j-1 >= 0){g[i][j] = max(g[i][j],f[i-1][j-1]+prices[i]);}}}return max(g[n-1][0],max(g[n-1][1],g[n-1][2]));}
};