Leetcode Problem 827. Making A Large Island

827. Making A Large Island

Leetcode Solutions

Approach #: Component Sizes with Group IDs

  1. Initialize a variable maxArea to keep track of the maximum island size found.
  2. Perform a depth-first search (DFS) on each cell in the grid to identify and label each connected component with a unique group ID, and calculate the size of each component.
  3. Store the sizes in a hash map area, with the group ID as the key and the component size as the value.
  4. Iterate over all cells in the grid. If a cell is 0, check its 4 neighboring cells.
  5. For each neighbor that is part of a group, add the group's size to a set to ensure unique group IDs are considered.
  6. Sum the sizes of the unique neighboring groups and add 1 for the flipped cell to get the potential island size.
  7. Update maxArea if the potential island size is larger than the current maxArea.
  8. If no 0 is flipped, set maxArea to the size of the largest component found during the DFS.
  9. Return maxArea as the final answer.
UML Thumbnail

Approach #: Naive Depth First Search

Ask Question

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

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...