Leetcode Problem 456. 132 Pattern

456. 132 Pattern

Leetcode Solutions

Using Stack to Find Pattern

  1. Create a min array to store the minimum value found so far at each index.
  2. Initialize a stack to keep track of potential nums[k] values.
  3. Iterate through the nums array from right to left.
  4. For each nums[j], check if it is greater than min[j].
  5. If it is, pop elements from the stack until the top element is greater than min[j].
  6. If the stack is not empty and the top element is less than nums[j], return true as we have found a 132 pattern.
  7. Push nums[j] onto the stack.
  8. If we reach the end of the array without returning true, return false as no 132 pattern exists.
UML Thumbnail

Brute Force to Find Pattern

Ask Question

Programming Language
image/screenshot of info(optional)
Full Screen
Loading...

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...