Best Time to Buy and Sell Stock

 You are given an array prices where prices[i] is the price of a given stock on the ith day.


You want to maximize your profit by choosing a single day to buy one stock and choosing a different day in the future to sell that stock.


Return the maximum profit you can achieve from this transaction. If you cannot achieve any profit, return 0.


 


Example 1:


Input: prices = [7,1,5,3,6,4]

Output: 5

Explanation: Buy on day 2 (price = 1) and sell on day 5 (price = 6), profit = 6-1 = 5.

Note that buying on day 2 and selling on day 1 is not allowed because you must buy before you sell.

Example 2:


Input: prices = [7,6,4,3,1]

Output: 0

Explanation: In this case, no transactions are done and the max profit = 0.



class Solution {
    public int maxProfit(int[] prices) {
       
     
       int maxprofix=0;
       int minimum=prices[0];
       
        for(int i=1;i<prices.length;i++)
        {
        int cost=prices[i]-minimum;

        maxprofix=Math.max(maxprofix,cost);
        minimum=Math.min(minimum,prices[i]);
        }
        return maxprofix;
    }
}

 

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