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类型：qbank
You are given an integer array prices where prices[i] is the price of NeetCoin on the ith day.
Examples
Example 1:
Input: prices = [10,1,5,6,7,1]
Output: 6
Explanation:
Buy prices[1] and sell prices[4], profit = 7 - 1 = 6.
Example 2:
Input: prices = [10,8,7,5,2]
Output: 0
Explanation:
No profitable transactions can be made, thus the max profit is 0.
Constraints
1 <= prices.length <= 100
0 <= prices[i] <= 100