0121 Best Time to Buy and Sell Stock

Solved at: 220713

Question

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.

Solution

I had to get a hint to keep the minimum value so far.

• Time Complexity: $O(n)$
• Space Complexity: $O(1)$