算法训练营笔记day51|309. 最佳买卖股票时机含冷冻期、714. 买卖股票的最佳时机含手续费

309. 最佳买卖股票时机含冷冻期

题目连接

笔记

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

714. 买卖股票的最佳时机含手续费

题目连接

笔记

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