Depth First Search Algorithm — DSA Technical Interview Questions & Answers

Depth First Search Algorithm

Depth First Search Algorithm

  • Depth First Search Algorithm is a DSA topic. In plain words you use it for find roll 12 in a sorted list. Don’t start with a slogan — start with that picture.
  • Smallest example: linear vs binary. Type it, run it, and say what you see. If you can do that from memory, you know Depth First Search Algorithm.
  • From the example next to this theory: Depth First Search Algorithm — dFS goes deep along a path before backtracking — natural with recursion/stack.
  • Trap: binary search on unsorted data. Fix that before you talk about advanced DSA.
  • Viva: what is Depth First Search Algorithm? Then show linear vs binary. Then name the trap.

Technical Interview Tip: What is Depth First Search Algorithm? Show this: linear vs binary. Trap: binary search on unsorted data.

Code Examples for Depth First Search Algorithm

Depth First Search Algorithm — working example

graph = {1: [2, 3], 2: [4], 3: [], 4: []}

def dfs(u, seen=None):
    if seen is None:
        seen = set()
    seen.add(u)
    order = [u]
    for v in graph[u]:
        if v not in seen:
            order += dfs(v, seen)
    return order

print(dfs(1))

Depth First Search Algorithm — dFS goes deep along a path before backtracking — natural with recursion/stack.

How to Explain Depth First Search Algorithm to an Interviewer

What is Depth First Search Algorithm?

Used for find roll 12 a sorted list Not just the heading

Give one small example of Depth First Search Algorithm.

linear vs binary Depth First Search Algorithm — dFS goes deep along a path before backtracking — natural with recursion/stack

What mistake do beginners make with Depth First Search Algorithm?

binary search on unsorted data Show the fix

Where do you use Depth First Search Algorithm?

a sorted list find roll 12