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ArrayGreedy

Given prices array where prices[i] is the price on day i. Maximize profit by choosing one day to buy and another day later to sell.

Input: prices = [7,1,5,3,6,4]
Output: 5
Buy day 2 (price=1), sell day 5 (price=6). Profit=5.

Input: prices = [7,6,4,3,1]
Output: 0
No profit possible.

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