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Leetcode#121 Best Time to Buy and Sell Stock

原题地址

 

Best Time to Buy and Sell Stock III(参见这篇文章)的简化版

迭代法求最大利润。当然是在峰值卖出,在低谷买进利润最大了。所以从后向前遍历所有价格,如果当前价格比之前的峰值价格还高,更新峰值价格,否则就用峰值价格减去当前价格看看利润多少。

 

代码:

 1 int maxProfit(vector<int> &prices) { 2         int profit = 0; 3         int climax = -1; 4          5         for (int i = prices.size() - 1; i >= 0; i--) { 6             if (prices[i] >= climax) 7                 climax = prices[i]; 8             else 9                 profit = max(profit, climax - prices[i]);10         }11         12         return profit;13 }

 

Leetcode#121 Best Time to Buy and Sell Stock