Easy

Quiz

#121 Best Time to Buy and Sell Stock

APPROACH

An array prices is given where prices[i] is the stock price on day i.

Choose a single day to buy and a later day to sell to maximize your profit.

Return the maximum achievable profit, or 0 if no profitable transaction is possible.

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.

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What is the optimal approach for this problem?