mediumRecursionPattern: Mixed
Boundary Length Calculator Solution
Problem Statement
Given a 2D grid of integers, where 0 represents an empty cell and 1 represents a filled cell, calculate the total perimeter length of all filled cells, considering each cell as a unit square and only counting edges that are adjacent to empty cells or the grid boundary.
Constraints
- The input grid size will be between 1x1 and 50x50.
- The grid will only contain 0s (empty space) and 1s (colonized planets).
Time: O(n) Space: O(n)
The optimized approach uses recursion to efficiently traverse the grid and only count borders where a cell is adjacent to empty space or the grid's edge, achieving a complexity of O(n) where n is the number of cells in the grid.
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