Snapchat vs Cisco: Interview Question Comparison

When preparing for technical interviews, company-specific question patterns reveal what skills to prioritize. Snapchat and Cisco both emphasize core data structures but with different intensity and focus areas. Understanding their question distributions helps you allocate study time effectively.

Question Volume and Difficulty

Snapchat's question pool is larger and more challenging. With 99 total questions, its distribution (99 Easy, 62 Medium, 31 Hard) shows a significant medium-hard skew—over 60% of questions are Medium or Hard. This reflects Snapchat's focus on complex problem-solving, especially for senior engineering roles. Expect multi-step problems requiring optimization.

Cisco's question set is smaller and leans easier. Its 86 questions break down as 22 Easy, 49 Medium, and 15 Hard. While Medium questions dominate, the overall difficulty is lower—only about 17% are Hard compared to Snapchat's 31%. Cisco interviews often assess solid fundamentals and practical application.

# Example of a medium-hard problem (common for Snapchat)
def word_break(s, wordDict):
    word_set = set(wordDict)
    dp = [False] * (len(s) + 1)
    dp[0] = True
    for i in range(1, len(s) + 1):
        for j in range(i):
            if dp[j] and s[j:i] in word_set:
                dp[i] = True
                break
    return dp[len(s)]

Topic Overlap

Both companies heavily test Array, String, and Hash Table problems. These form the foundation for most interviews.

Snapchat adds Breadth-First Search (BFS) as a key topic. This signals frequent graph and tree traversal problems, often involving level-order traversal or shortest path in unweighted graphs. Expect scenarios like social network connections or UI layer traversal.

Cisco emphasizes Two Pointers. This indicates a focus on efficient array/string manipulation—think problems involving sorted data, palindromes, or sliding windows. It's a practical pattern for optimizing space and time.

# Two Pointers example (common for Cisco)
def two_sum_sorted(numbers, target):
    left, right = 0, len(numbers) - 1
    while left < right:
        current_sum = numbers[left] + numbers[right]
        if current_sum == target:
            return [left + 1, right + 1]
        elif current_sum < target:
            left += 1
        else:
            right -= 1
    return [-1, -1]

Which to Prepare for First

Start with Cisco if you're building fundamentals. Its focus on core structures with a strong Two Pointers pattern provides a manageable scope. Mastering these will give you confidence for medium-difficulty problems.

Prepare for Snapchat after solidifying basics and aiming for higher difficulty. The addition of BFS and greater volume of Hard questions requires advanced graph knowledge and optimized solutions under pressure.

Ultimately, the shared core topics mean studying for one benefits the other. Prioritize Arrays, Strings, and Hash Tables, then branch into Two Pointers for Cisco or BFS for Snapchat.

For more details, visit the Snapchat question list and Cisco question list.