3. Best Time to Buy and Sell Stock
Given an array prices, return the maximum profit you can achieve from one buy and one sell.
उदाहरण 1:
इनपुट: prices = [7,1,5,3,6,4] आउटपुट: 5
उदाहरण 2:
इनपुट: prices = [7,6,4,3,1] आउटपुट: 0
सीमाएँ:
1 <= prices.length <= 10^5