Leetcode Problem 2765. Longest Alternating Subarray

2765. Longest Alternating Subarray

Leetcode Solutions

Two Pointers Approach

  1. Initialize max_length to -1, indicating no valid subarray found yet.
  2. Initialize start and end pointers to 0.
  3. Iterate through the array starting from the second element.
  4. For each element at index i, check if it continues the alternating pattern with the previous element.
  5. If the pattern continues, increment end.
  6. If the pattern breaks or it's the last element, check if the length of the subarray is greater than 1 and update max_length if necessary.
  7. If the pattern breaks, reset start to the current index i.
  8. After the loop, return max_length.
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Dynamic Programming Approach

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