• Best Time to Buy and Sell Stock 
    class Solution:
  def maxProfit(self,prices):
      left = 0 # Buy
      right = 1 # Sell
      max_profit = 0
      while right < len(prices):
          profit = prices[right] - prices[left] # our current profit
          if prices[left] < prices[right]:
              max_profit = max(profit,max_profit)
          else:
              left = right
          right += 1
      return max_profit

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