Salesforce interview questions

The Maze

Given a grid maze where a ball, once rolled, continues in a direction until it hits a wall, determine whether the ball can reach and…

Companies: Salesforce, Meta

Last reported May 2025

Amount of Time for Binary Tree to Be Infected

Given a binary tree and a start node, compute how many minutes it takes for an infection that spreads each minute to adjacent nodes (parent/children)…

Companies: Salesforce, Microsoft

Binary Tree · Breadth-First Search · Depth-First Search · Hash Table

Angle Between Hands of a Clock

Compute the positions of the clock's hour and minute hands (noting the hour hand moves continuously with minutes) and return the smaller angular difference between…

Companies: Salesforce, Microsoft, Zoho

Math

Asteroid Collision

Given signed integers for asteroid sizes and directions, determine which asteroids remain after sequential collisions where only opposite-moving neighbors (positive then…

Companies: Salesforce, Amazon, D. E. Shaw, JPMorgan Chase +2

Array · Simulation · Stack

Count Vowel Substrings of a String

Count the number of contiguous substrings that consist only of vowels and contain all five vowels (a, e, i, o, u) at least once. The…

Companies: Salesforce, D. E. Shaw, Expedia, Snowflake

Hash Table · String

Course Schedule

Given courses as nodes and prerequisite pairs as directed edges, determine whether the directed graph is acyclic — return true if a topological ordering exists…

Companies: Salesforce, Amazon, Anduril, Cloudflare +6

Breadth-First Search · Depth-First Search · Directed Acyclic Graph · Graph Theory

Course Schedule II

Given numCourses and prerequisite pairs, return any ordering of courses that satisfies all prerequisites or an empty array if impossible — this is essentially computing…

Companies: Salesforce, Amazon, Anduril, Apple +11

Breadth-First Search · Depth-First Search · Graph Theory · Topological Sort

Distance to a Cycle in Undirected Graph

Given an undirected graph, return for every vertex the shortest distance to the nearest vertex that lies on any cycle. Key idea: identify cycle vertices…

Companies: Salesforce

Breadth-First Search · Depth-First Search · Graph Theory · Topological Sort

Explain ML and LLM fundamentals

Companies: Salesforce

ML Fundamentals · Model Evaluation

Fruit Into Baskets

Given an array of fruit types where you can pick from a contiguous sequence while carrying at most two distinct types (two baskets), return the…

Companies: Salesforce, Adobe, Amazon, Meta

Array · Hash Table · Sliding Window

Jump Game II

Given an array where nums[i] is the maximum forward jump from index i, compute the minimum number of jumps needed to reach the last index…

Companies: Salesforce, Amazon, Flipkart

Array · Dynamic Programming · Greedy

Last Stone Weight

Given an array of stone weights, repeatedly take the two heaviest stones, remove them, and if their weights differ push back the difference; return the…

Companies: Salesforce, Apple

Array · Heap (Priority Queue)

Maximum Team Size with Overlapping Intervals

Companies: Salesforce

Meeting Rooms II

Given a list of meeting time intervals, determine the minimum number of conference rooms required so that no meetings overlap. The core challenge is computing…

Companies: Salesforce, Amazon, Apple, Google +9

Array · Greedy · Heap (Priority Queue) · Prefix Sum

Merge k Sorted Lists

Companies: Salesforce, Amazon, Meta, NVIDIA +3

Divide and Conquer · Heap (Priority Queue) · Linked List · Merge Sort

Minimum Edge Reversals So Every Node Is Reachable

Given a directed graph whose underlying undirected graph is a tree, compute for every node the minimum number of edge reversals required so that starting…

Companies: Salesforce, Microsoft, Uber

Breadth-First Search · Depth-First Search · Dynamic Programming · Graph Theory

Minimum Operations to Reduce an Integer to 0

Given n, you may add or subtract any power of two per operation; find the minimum number of such operations to reach 0. The core…

Companies: Salesforce, Uber

Bit Manipulation · Dynamic Programming · Greedy

Minimum Removals to Balance Array

Given nums and k, remove the fewest elements so the remaining array has max ≤ k * min. Equivalently, find the largest subset of numbers…

Companies: Salesforce

Array · Binary Search · Sliding Window · Sorting

Minimum Replacements to Sort the Array

Given an integer array where you may replace any element with two positive integers summing to it, find the minimum number of such split operations…

Companies: Salesforce

Array · Greedy · Math

Optimal Account Balancing

Given a list of money transfers among people, compute the minimum number of transactions required to settle all debts so every person's net balance becomes…

Companies: Salesforce, Pinterest, Visa

Array · Backtracking · Bit Manipulation · Bitmask

Palindrome Partitioning

Partition the input string s into substrings so that every substring is a palindrome, and return all possible such partitions. This is typically solved by…

Companies: Salesforce

Backtracking · Dynamic Programming · String

Partition Array Into Two Arrays to Minimize Sum Difference

Partition the 2n integers into two equal-sized groups (choose n elements for one group) to minimize the absolute difference of their sums — a constrained…

Companies: Salesforce

Array · Binary Search · Bit Manipulation · Bitmask