You are given an array `prices` where `prices[i]` is the price of a given stock on the `i`th 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
Example 1
Input:
prices = [7,1,5,3,6,4]Output:
5Buy 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:
0In this case, no transactions are done and the max profit = 0.
Constraints
- •
1 <= prices.length <= 10^5 - •
0 <= prices[i] <= 10^4
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