121. Best Time to Buy and keep Stock, sellstock

Source: Internet
Author: User

121. Best Time to Buy and keep Stock, sellstock

Say you have an array for whichITh element is the price of a given stock on dayI.

If you were only permitted to complete at most one transaction (ie, buy one and every one share of the stock), design an algorithm to find the maximum profit.

Example 1:

Input: [7, 1, 5, 3, 6, 4]Output: 5max. difference = 6-1 = 5 (not 7-1 = 6, as selling price needs to be larger than buying price)


Example 2:

Input: [7, 6, 4, 3, 1]Output: 0In this case, no transaction is done, i.e. max profit = 0.

 1 class Solution { 2 public: 3     int maxProfit(vector<int>& prices) { 4         if(prices.size() <= 1){ 5             return 0; 6         } 7          8         int minP = prices[0]; 9         int profit = 0;10         11         for(int i = 1; i < prices.size(); i ++){12             minP = min(minP, prices[i]);13             profit = max(profit, prices[i]-minP);14         }15         return profit;16     }17 };


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