message: Update maximum-profit-from-trading-stocks.cpp
diff: -// Time: O(n)
  -// Space: O(1)
  +// Time: O(n * b)
  +// Space: O(b)
  // dp, optimized from solution2
  class Solution {
  @@ -18,8 +18,8 @@ public:
  }
  };
  -// Time: O(n)
  -// Space: O(1)
  +// Time: O(n * b)
  +// Space: O(b)
  // dp
  class Solution2 {
  public:
  