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SDE Interview Essentials

Intermediate

Core problems every SDE should solve

Core problems every SDE should solve. Work through 100 hand-picked problems grouped by topic and track your progress.

100 problems ~60 days by CompileMate 33E 50M 17H

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Majority Element

Easy

Running Sum of an Array

Easy

Valid Palindrome

Easy

Third Distinct Maximum

Easy

Missing Number

Easy

Contains Duplicate

Easy

First Unique Character

Easy

Roman to Integer

Easy

Pascal's Triangle

Easy

Count Primes

Easy

Maximum Subarray

Easy

Intersection of Two Arrays

Easy

Happy Number

Easy

Squares of a Sorted Array

Easy

Isomorphic Strings

Easy

Binary Search

Easy

Find the Balance Index

Easy

Move Zeroes

Easy

Is Subsequence

Easy

Max Consecutive Ones

Easy

Reverse String

Easy

Valid Anagram

Easy

Two Sum

Easy

Best Time to Buy and Sell Stock

Easy

Search Insert Position

Easy

House Robber II

Medium

Find Peak Element

Medium

Longest Consecutive Sequence

Medium

Container With Most Water

Medium

Minimum Path Sum

Medium

Subsets

Medium

Longest Substring Without Repeating Characters

Medium

Longest Palindromic Substring

Medium

Partition Labels

Medium

Shortest Subarray With Sum ≥ Target

Medium

Kth Largest Element in an Array

Medium

Capacity to Ship Packages Within D Days

Medium

House Robber

Medium

Coin Change

Medium

Word Break

Medium

Number of Islands

Medium

Subarrays Summing to K

Medium

Best Time to Buy and Sell Stock II

Medium

Permutations

Medium

Spiral Matrix

Medium

Two Sum II - Input Array Is Sorted

Medium

3Sum Closest

Medium

Rotate Image

Medium

Find Minimum in Rotated Sorted Array

Medium

Letter Combinations of a Phone Number

Medium

Koko Eating Bananas

Medium

Combination Sum

Medium

Set Matrix Zeroes

Medium

Permutation in String

Medium

K Closest Points to Origin

Medium

Jump Game

Medium

Longest Repeating Character Replacement

Medium

Product of Array Except Self

Medium

Merge Sorted Array

Medium

Sort Colors (Dutch Flag)

Medium

Maximum Product Subarray

Medium

Rotate Array

Medium

N-Queens

Hard

Trapping Rain Water

Hard

Largest Rectangle in Histogram

Hard

Jump Game II

Hard

Sliding Window Maximum

Hard

Median of Two Sorted Arrays

Hard

Minimum Window Substring

Hard

Word Ladder

Hard

First Missing Positive

Hard

FizzBuzz

Easy

Length of Last Word

Easy

Add Binary Strings

Easy

Valid Parentheses

Easy

Decode Ways

Medium

Longest Common Prefix

Medium

Excel Sheet Column Number

Medium

Edit Distance

Hard

Distinct Subsequences

Hard

Longest Valid Parentheses

Hard

Days Until Warmer

Medium

Next Greater Element (Circular)

Medium

First Bad Version

Easy

Search a Sorted 2D Matrix

Medium

Binary Tree Level Order Traversal

Medium

Count of Smaller Numbers After Self

Hard

Split Array Largest Sum

Hard

Number of Provinces

Medium

Course Schedule

Medium

Rotting Oranges

Medium

Longest Increasing Path in a Matrix

Hard

Network Delay Time

Hard

Target Sum

Medium

Perfect Squares

Medium

Unique Paths

Medium

Burst Balloons

Hard

Reverse Bits

Easy

Palindrome Number

Easy

Power of Two

Easy