Leetcode Problem 1916. Count Ways to Build Rooms in an Ant Colony

1916. Count Ways to Build Rooms in an Ant Colony

Leetcode Solutions

DFS with Combinatorics and Modular Arithmetic

  1. Initialize a graph representation of the rooms and their dependencies.
  2. Perform a DFS traversal starting from room 0.
  3. For each node (room) visited, calculate the number of ways to build its subtree.
  4. Use combinatorics to combine the number of ways from the children subtrees.
  5. Apply modular arithmetic to ensure the result does not exceed the given modulus.
  6. Return the number of ways to build the subtree rooted at room 0, which is the final answer.
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Dynamic Programming with Topological Sorting

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