123.买卖股票的最佳时机-iii.java

/*
 * @lc app=leetcode.cn id=123 lang=java
 *
 * [123] 买卖股票的最佳时机 III
 */

// @lc code=start
class Solution {
    public int maxProfit(int[] prices) {
        int buy1 = -prices[0], sell1 = 0;
        int buy2 = -prices[0], sell2 = 0;
        for(int i = 1;i < prices.length;++i){
            buy1 = Math.max(buy1, - prices[i]);
            sell1 = Math.max(sell1, buy1 + prices[i]);
            buy2 = Math.max(buy2, sell1 - prices[i]);
            sell2 = Math.max(sell2, buy2 + prices[i]);
        }
        return sell2;
    }
}
// @lc code=end