Tiktok Machine Learning Engineer Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Maximize sum with no adjacent elements
Given an array of non-negative integers nums, choose a subset of elements such that no two chosen elements are adjacent in the original array. Return ...
Implement stack variants and path-sum check
Coding tasks Solve the following algorithmic problems. 1) MinStack Design a stack supporting: - push(x), pop(), top() - getMin() returning the minimum...
Find length of longest common subsequence
Given two strings s and t, return the length of their longest common subsequence. A subsequence is obtained by deleting zero or more characters withou...
Implement local maxima, bagging, and k-means
Solve the following programming tasks. 1) Find all “local maxima” in a streaming temperature array You are cleaning sensor data for temperature-fluctu...
Generate all safe queen placements on board
You are given an integer n representing the size of a chessboard (n × n). You need to place n queens on the board so that no two queens attack each ot...
Compute longest increasing subsequence
Given an integer array nums, compute the length of a longest strictly increasing subsequence and also output one valid subsequence. Aim for an O(n log...
Find longest substring without repeating characters
Problem Given a string s, find the length of the longest contiguous substring that contains no repeated characters. Input - A string s (may contain le...
Find and count target-sum subarrays
Given an integer array nums and an integer target, implement: ( 1) a function that returns true if any non-empty contiguous subarray sums to target; (...
Compute minimum path sum in a triangle
Given a triangle of integers represented as a list of rows, find the minimum path sum from the top to the bottom. - From row r and index c, you may mo...
Differentiate virtual and pure virtual functions
In C++, what is the difference between a virtual function and a pure virtual function? Provide syntax examples, describe dynamic dispatch via the vtab...
Find second-minimal word segmentation count
Given a string s and a dictionary D of non-empty words, define a 'segmentation' as splitting s into a sequence of words from D whose concatenation equ...
Determine if a string can be segmented
Given a string s and a list of strings wordDict, determine whether s can be segmented into a sequence of one or more dictionary words. - You may reuse...
Determine frog reachability across stones
You are given a sorted array of distinct integers stones representing stone positions in a river, where stones[0] = 0. A frog starts on stone 0; its f...
Compute city skyline silhouette
Compute the outer silhouette of a 2D skyline. You are given n axis-aligned rectangular buildings; each building i is (Li, Ri, Hi) with 0 <= Li < Ri an...
Fix a BST with two misplaced keys
You are given the root of a binary search tree in which exactly two nodes’ keys were accidentally swapped. Restore the tree so that its in-order trave...
Count subarrays summing to target
Question LeetCode 560. Subarray Sum Equals K – Given an integer array nums and an integer k, return the total number of continuous subarrays whose sum...