Best Time to Buy and Sell Stock
Easy
Array
Dynamic Programming
Greedy

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.

Examples:

Input:[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.
Input:[7,6,4,3,1]
Output:0
Explanation: In this case, no transactions are done and the max profit = 0.

Constraints:

  • 1 ≤ prices.length ≤ 10⁵
  • 0 ≤ prices[i] ≤ 10⁴
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