Buy And Sell Crypto

class Solution {
    public int maxProfit(int[] prices) {
        int maxProfit = 0;

        for (int fast = 1, slow = 0; fast < prices.length; fast++) {
            int profit = prices[fast] - prices[slow];

            maxProfit = Math.max(maxProfit, profit);

            if (prices[fast] < prices[slow]) {
                slow = fast;
            }
        }

        return maxProfit;
    }
}

class Solution:
    def maxProfit(self, prices: List[int]) -> int:

        maxProfitTrade, slow = 0, prices[0]

        for price in prices:
            profit = price - slow

            maxProfitTrade = max(maxProfitTrade, profit)
            slow = min(slow, price)

        return maxProfitTrade