Problem
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. If you cannot achieve any profit, return 0.
Constraints
- 1 <= prices.length <= 10^5
- 0 <= prices[i] <= 10^4
Function Signature
def max_profit(prices: list[int]) -> int:
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