目录

123 买卖股票的最佳时机III  

188 买卖股票的最佳时机IV 

---

123 买卖股票的最佳时机III  

class Solution {
public:int maxProfit(vector<int>& prices) {vector<vector<int>> dp(prices.size() + 1, vector<int>(5, 0));dp[0][0] = 0;dp[0][1] = -prices[0];dp[0][2] = 0;dp[0][3] = -prices[0];dp[0][4] = 0;for(int i = 1; i < prices.size(); i++){dp[i][0] = dp[i - 1][0];dp[i][1] = max(dp[i-1][1], dp[i-1][0] - prices[i]);dp[i][2] = max(dp[i-1][2], dp[i-1][1] + prices[i]);dp[i][3] = max(dp[i-1][3], dp[i-1][2] - prices[i]);dp[i][4] = max(dp[i-1][4], dp[i-1][3] + prices[i]);}return dp[prices.size()-1][4];}
};

188 买卖股票的最佳时机IV 

class Solution {
public:int maxProfit(int k, vector<int>& prices) {vector<vector<int>> dp(prices.size()+1, vector<int>(2*k+1, 0));for(int i = 1; i < 2*k+1; i += 2){dp[0][i] = -prices[0];}for(int i = 1; i < prices.size(); i++){for(int j = 1; j <= 2*k; j+=2){dp[i][j] = max(dp[i-1][j], dp[i-1][j-1] - prices[i]);dp[i][j+1] = max(dp[i-1][j+1], dp[i-1][j] + prices[i]);}}return dp[prices.size()-1][2*k];}
};