Leetcode Problem 1562. Find Latest Group of Size M

1562. Find Latest Group of Size M

Leetcode Solutions

Count the Length of Groups

  1. Initialize a length array of size n + 2 to track the length of groups, and a count array of size n + 1 to track the count of groups of each length.
  2. Iterate through each element a in the array arr.
  3. For each a, find the length of the group to the left (length[a - 1]) and to the right (length[a + 1]).
  4. Update the length array at positions a, a - left, and a + right to the new group length left + right + 1.
  5. Update the count array by decrementing the counts for left and right and incrementing the count for the new group length.
  6. If count[m] is greater than 0, update the result to the current step index i + 1.
  7. Return the result if a group of length m was found; otherwise, return -1.
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Union Find with Reverse Mapping

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