Snapchat Coding & Algorithms Interview Questions
Preparing for Snapchat Coding & Algorithms interview questions requires focused, product-aware practice and polished communication. Snapchat’s coding interviews typically emphasize algorithmic problem solving under time pressure, clean implementation, and trade-off reasoning: expect array and string manipulation, trees and graphs, dynamic programming, hashing, and common system-aware constraints like memory and runtime. Interviewers evaluate your problem breakdown, correctness, edge-case handling, coding style, and how you test and iterate on solutions. Many candidates see a phone screen followed by several live coding rounds and a behavioral/system-design conversation, so pacing and clarity matter as much as raw solutions. Effective interview preparation combines deliberate practice on medium-to-hard algorithm problems with mock interviews that simulate time limits and explain-your-thoughts cadence. Focus on pattern recognition, writing bug-free code quickly, and narrating trade-offs as you choose approaches. Reinforce fundamentals, replay common LeetCode patterns with variations, and rehearse concise STAR stories that connect technical impact to product outcomes. Approaching practice this way reduces anxiety, makes your reasoning visible, and raises the chances that your solution — not just your speed — stands out.
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Check if a binary tree is complete
You are given the root of a binary tree. Determine whether the tree is a complete binary tree. A binary tree is complete if: - Every level, except pos...
Check whether an integer is a power of two
Given a signed 32-bit integer n, return true if n is an exact power of 2, otherwise return false. A power of 2 is a number of the form 2^k where k >= ...
Count ways to decode digit string
You are given a string s consisting of digits '0' to '9'. The string encodes a message using the following mapping: - '1' → A, '2' → B, ..., '26' → Z....
Compute longest increasing path in matrix
You are given an m x n grid (matrix) of integers grid, where m >= 1 and n >= 1. A path in the matrix is a sequence of cells where: - You may move from...
Implement sin(x) with precision constraints
Coding Question: Implement sin(x) Implement a function that returns an approximation of the trigonometric sine function. Function signature - Input: a...
Find max node-value range across components
Problem You are given an undirected graph with: - n: number of nodes (assume nodes are labeled 1..n) - from[]: list of edge start nodes - to[]: list o...
Implement a dictionary without built-in Dictionary
Implement a key-value map type (a “dictionary” / hash map) from scratch, without using the language’s built-in dictionary/map as the underlying storag...
Implement a size-bounded LRU cache
Design and implement an LRU (Least Recently Used) cache where the cache capacity is measured by total size, not by item count. Each cached item has a ...
Implement LRU cache and prime products array
You are given two separate coding tasks. Task 1: Implement an LRU cache Implement an in-memory cache with a fixed capacity that evicts the least recen...
Solve a two-jug measuring problem
You are given two jugs with capacities x and y liters and an unlimited water source. You may perform these operations: fill a jug, empty a jug, or pou...
Solve Open the Lock BFS
Question LeetCode 752. Open the Lock – Given an initial lock state "0000", a target combination, and a list of deadend combinations that cannot be use...
Implement XML tokenizer and parser with operations
You are given either (a) a raw XML-like string such as <catalog><book><author>Gambardella, Matthew</author></book></catalog> or (b) its tokenized form...
Find top co-purchased products
You receive purchase logs where each order is represented as an integer array of product IDs bought together in a single transaction. Implement a func...
Implement binary search for boundary index
Given a sorted integer array nums (length n) and an integer target t, return the index of the first element in nums that is greater than or equal to t...
Compute maximum perimeter among islands
Problem You are given an m x n binary grid grid where: - grid[r][c] = 1 represents land - grid[r][c] = 0 represents water An island is a maximal set o...
Determine and print expression to reach target
You are given four numbers and a target T (e.g., 24). Using +, −, ×, ÷ and parentheses, and using each number exactly once, determine whether you can ...
Solve rotating-lock BFS with blockers
You are given a 4-digit lock starting at "0000". In one move, you may pick a single position and rotate it +1 or −1 with wrap-around (0→9 on −1, 9→0 o...
Compute islands in a binary grid
You are given an m-by-n grid of characters where '1' represents land and '0' represents water. Count the number of connected land masses (islands) usi...
Count islands with eight-direction adjacency
You are given an m×n grid of characters '1' (land) and '0' (water). Count the number of islands, where cells are connected if they touch in any of the...
Find index of first unique character
Given a string s, return the index of the first character that appears exactly once; if none exists, return -1. Assume s may include both lowercase an...