Leetcode Problem 753. Cracking the Safe

753. Cracking the Safe

Leetcode Solutions

DFS to Find Eulerian Path in De Bruijn Graph

  1. If n is 1, return a string containing all digits from 0 to k-1 as each digit itself is a password.
  2. Initialize an empty set seen to keep track of visited combinations.
  3. Initialize an empty list result to store the sequence that will unlock the safe.
  4. Define a starting node as a string of n-1 zeros.
  5. Perform a DFS starting from the starting node.
  6. For each node (current combination), try to extend it by appending each digit from 0 to k-1 and check if the new combination has been seen.
  7. If the new combination is new, add it to seen and recursively call DFS with the new node.
  8. After exploring all extensions from the current node, add the current digit to result.
  9. After the DFS is complete, join the result list into a string and append the starting node to it to form the final password.
UML Thumbnail

Greedy DFS with Reused Suffixes

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