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122. Best Time to Buy and Sell Stock II 👍

  • Time: $O(n)$
  • Space: $O(1)$
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class Solution {
 public:
  int maxProfit(vector<int>& prices) {
    int sell = 0;
    int hold = INT_MIN;

    for (const int price : prices) {
      sell = max(sell, hold + price);
      hold = max(hold, sell - price);
    }

    return sell;
  }
};

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class Solution {
  public int maxProfit(int[] prices) {
    int sell = 0;
    int hold = Integer.MIN_VALUE;

    for (final int price : prices) {
      sell = Math.max(sell, hold + price);
      hold = Math.max(hold, sell - price);
    }

    return sell;
  }
}

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class Solution:
  def maxProfit(self, prices: list[int]) -> int:
    sell = 0
    hold = -math.inf

    for price in prices:
      sell = max(sell, hold + price)
      hold = max(hold, sell - price)

    return sell