Salesforce Coding Interview Questions
100 Salesforce coding interview problems with full optimal solutions — 30 easy, 50 medium, 20 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Salesforce interviewer values, and a FAQ section.
Showing 22 problems of 100
- #31mediumfrequently asked
31. Add Two Numbers
Add two numbers represented as linked lists (digits in reverse order). Salesforce asks this to test carry propagation and dummy-head pattern application together.
- #32mediumfrequently asked
32. Longest Substring Without Repeating Characters
Find the length of the longest substring without repeating characters. Salesforce uses this as the canonical sliding-window introduction — they grade on left-pointer correctness.
- #35mediumfrequently asked
35. 3Sum
Find all unique triplets in an array that sum to zero. Salesforce uses this to test sort + two-pointer + dedup composition — a real Salesforce engineer must combine all three.
- #41mediumfrequently asked
41. Search in Rotated Sorted Array
Search for a target in a rotated sorted array in O(log n). Salesforce uses this to test modified binary search — they value the 'figure out which half is sorted' reasoning.
- #42mediumfrequently asked
42. Find First and Last Position of Element in Sorted Array
Find the first and last position of a target in a sorted array in O(log n). Salesforce uses this to test the lower_bound / upper_bound pattern, used in their SOQL index range queries.
- #45mediumfrequently asked
45. Permutations
Return all permutations of a distinct-integer array. Salesforce uses this as the cleanest backtracking template — perfect for testing 'used' tracking.
- #47mediumfrequently asked
47. Group Anagrams
Group strings that are anagrams of each other. Salesforce uses this to test canonical-form hashing — they want O(n*k) with a frequency-tuple key.
- #48mediumfrequently asked
48. Maximum Subarray
Find the contiguous subarray with the largest sum. Salesforce uses this to test Kadane's algorithm — the canonical O(n) DP and a forecasting-dashboard staple.
- #51mediumfrequently asked
51. Merge Intervals
Merge overlapping intervals in a list. Salesforce uses this as a foundational scheduling problem — they use it directly in their calendar conflict-resolution and queue-coalescing logic.
- #60mediumfrequently asked
60. Subsets
Return all possible subsets of a distinct-integer array. Salesforce uses this to test power-set enumeration via backtracking or bitmask.
- #63mediumfrequently asked
63. Validate Binary Search Tree
Determine if a binary tree is a valid BST. Salesforce uses this to test the recursive-with-bounds pattern that catches the 'check parent only' trap.
- #64mediumfrequently asked
64. Binary Tree Level Order Traversal
Return the level-order (BFS) traversal of a binary tree's values. Salesforce uses this as the canonical BFS template — they use the level-tracking pattern in their org-hierarchy reports.
- #67mediumfrequently asked
67. Word Break
Determine if a string can be segmented into a sequence of dictionary words. Salesforce uses this as the canonical DP-on-strings problem.
- #68mediumfrequently asked
68. LRU Cache
Design a Least-Recently-Used cache with O(1) get and put. Salesforce uses this as the canonical data-structure-design problem — they use LRU eviction in their platform cache layer.
- #70mediumfrequently asked
70. Number of Islands
Count the number of connected components of 1s in a 2D grid. Salesforce uses this as the canonical grid-DFS/BFS problem.
- #71mediumfrequently asked
71. Course Schedule
Determine if all courses can be finished given prerequisite pairs (cycle detection in a directed graph). Salesforce uses this directly in their workflow-rule cycle detection.
- #72mediumfrequently asked
72. Implement Trie (Prefix Tree)
Implement a trie supporting insert, search, and startsWith. Salesforce uses tries in their autocomplete and SOQL keyword lookup.
- #73mediumfrequently asked
73. Kth Largest Element in an Array
Find the kth largest element in an unsorted array. Salesforce uses this as the canonical heap/quickselect problem.
- #74mediumfrequently asked
74. Lowest Common Ancestor of a Binary Tree
Find the lowest common ancestor (LCA) of two nodes in a binary tree. Salesforce uses this in their role-hierarchy queries — 'find the common manager between two reports.'
- #75mediumfrequently asked
75. Product of Array Except Self
Return an array where each element is the product of all other elements (no division allowed). Salesforce uses this to test prefix-products and the no-division trick.
- #76mediumfrequently asked
76. Meeting Rooms II
Find the minimum number of meeting rooms needed for a set of meetings with start/end times. Salesforce uses this in their Calendar app's room booking and resource allocation algorithms.
- #79mediumfrequently asked
79. Top K Frequent Elements
Return the k most frequent elements. Salesforce uses this for top-k report queries — they grade on heap vs bucket-sort recognition.
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