Bytedance Software Engineer Coding & Algorithms Interview Questions
Practice 23 real Coding & Algorithms interview questions for Software Engineer roles at Bytedance.
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Reverse Nodes in K-Sized Groups
Given the head of a singly linked list and an integer k, reverse the nodes of the list in contiguous groups of size k. Requirements: - Only complete g...
Count Target-Sum Paths in an N-ary Tree
You are given the root of an N-ary tree. Each node contains an integer value and a list of zero or more child nodes. You are also given an integer tar...
Find LCA With Parent Pointers
Given two nodes in a rooted tree, find their lowest common ancestor. Each node has a pointer to its parent. You are not given the root of the tree. De...
Minimize Increments to Equalize Path Costs
You are given a perfect binary tree with n nodes, labeled from 1 to n in level-order. For any non-leaf node i, its left child is 2 i and its right ch...
Build a validated add-sub calculator
Given a string expression, write a function that validates and evaluates it. The expression represents arithmetic using only non-negative integers and...
Solve String Addition and Expression Evaluation
The interview included two coding problems: 1. Add numbers from character arrays - You are given two non-empty character arrays, where each array r...
Solve Sliding Window and Grid Search
In a Software Engineer phone screen, the candidate was asked to solve two coding problems. 1. Longest substring with at most k distinct characters ...
Solve interval merging and histogram area
The coding round included two algorithm problems: 1. Merge overlapping intervals: Given a list of closed intervals [[start1, end1], [start2, end2], .....
Reverse Words While Preserving Spaces
Implement a C++ function that reverses the order of words in a string. Assume a word is any maximal sequence of non-space characters, and the input co...
Find Maximum Candies With Two Types
You are given a row of candies represented by an array candies, where candies[i] is the type of the candy at position i. You may choose any starting p...
Implement Sliding Windows and LRU Cache
You are given two coding tasks. Task 1: Longest Subarray of Ones Given a binary array nums and an integer k, return the maximum length of a contiguous...
Compute square root with precision
Given a non-negative integer val and a non-negative integer precise, compute the square root of val without using any built-in square-root function. R...
Solve these string, subset, and date problems
You are asked to solve multiple coding tasks. 1) Reverse word order in a string - Input: a string s containing words separated by spaces (may contain ...
Find Missing Ranges with Bounds
Given a sorted array of distinct integers nums and two integers lower and upper that define an inclusive interval [lower, upper], return all maximal r...
Find Words in a Character Grid
Implement findWords(board, words) for a word-search game. You are given an m x n grid of lowercase English letters and a list of lowercase dictionary ...
Find Minimum Time Across a Grid
You are given an n x n grid of non-negative integers. Each value represents the earliest time at which that cell becomes traversable. You start at the...
Implement Interval Insert and Dedup
This interview round contained two coding problems: 1. Insert and merge intervals. You are given a list of non-overlapping intervals sorted by start t...
Validate a bracket string
Given a string s containing only the characters '(', ')', '{', '}', '[', and ']', determine whether the input string is valid. A string is valid if: 1...
Count Similar Photo Groups
You are given n photos labeled 0 to n - 1 and an n x n binary matrix isSimilar. - isSimilar[i][j] = 1 means photo i and photo j are directly similar. ...
Compute root-to-leaf number sum
Given the root of a binary tree where each node stores a digit from 0 to 9, every root-to-leaf path represents a decimal number formed by concatenatin...