Roadmap/Arrays

5 subtopics · 41 problems

Arrays

Work through 5 subtopics covering 41 problems, ordered from foundational to advanced.

41Total problems

0Solved

0Attempted

0%Completion

Largest Element

Arrays

Easy

10m

Second Largest Element

Arrays

Easy

15m

Check if an Array is Sorted

Arrays

Easy

10m

Remove Duplicates from Sorted Array

Arrays · Two Pointers

Easy

15m

Left Rotate an Array by 1 Place

Arrays

Easy

10m

Left Rotate an Array by K Places

Arrays · Two Pointers

Medium

20m

Move Zeros to the End of an Array

Arrays · Two Pointers

Easy

15m

Find the Element K in the Array

Arrays

Easy

10m

Union of Two Sorted Arrays

Arrays · Two Pointers

Easy

20m

Finding the Missing Number in an Array

Arrays · Hashing · Bit Manipulation

Easy

15m

Maximum Consecutive Ones in an Array

Arrays · Sliding Window

Easy

10m

Finding the Single Element in an Array

Arrays · Bit Manipulation

Easy

15m

Longest Sub-Array of Positive Integers with Sum K

Arrays · Two Pointers · Sliding Window

Medium

25m

Longest Sub-Array with Sum K

Arrays · Hashing · Prefix Sum

Medium

25m

Count Subarrays with Target Sum

Arrays · Hashing · Prefix Sum

Medium

25m

Largest Subarray Sum

+1

Arrays · Dynamic Programming · Divide and Conquer

Medium

20m

Maximum Subarray Product

Arrays · Dynamic Programming

Medium

25m

Largest Subarray With Zero Sum

Arrays · Hashing · Prefix Sum

Medium

20m

Subarray with given XOR

Arrays · Hashing · Bit Manipulation

Medium

25m

Two Sum

+2

Arrays · Hashing · Two Pointers

Easy

15m

Arrange Colors in Order

+1

Arrays · Two Pointers · Sorting

Medium

20m

Majority Element

+1

Arrays · Hashing · Greedy

Easy

15m

Maximize Share Profit

+1

Arrays · Greedy · Dynamic Programming

Easy

15m

Array Rearrangement

Arrays · Two Pointers

Medium

25m

Find the Next Permutation

Arrays · Two Pointers · Backtracking

Medium

25m

Finding Dominant Elements in an Array

Arrays · Sorting

Medium

25m

Merge Two Sorted Array

Arrays · Two Pointers · Sorting

Medium

20m

Zero Fill Matrix

Arrays · Matrix

Medium

25m

Grid Rotation

Arrays · Matrix

Medium

25m

Spiral Matrix

+1

Arrays · Matrix · Simulation

Medium

25m

Sum of Diagonals

Arrays · Matrix

Easy

15m

Find Position in 2D Array

Arrays · Matrix · Binary Search

Easy

15m

Pascal's Triangle

+1

Arrays · Maths · Dynamic Programming

Easy

20m

Majority Element II

Arrays · Hashing

Medium

25m

Three Sum

+2

Arrays · Two Pointers · Sorting

Medium

25m

Four Sum

Arrays · Two Pointers · Sorting

Medium

30m

Merge Intervals

+2

Arrays · Sorting · Greedy

Medium

25m

Missing and Repeating Elements

Arrays · Hashing · Maths

Medium

25m

Count The Inversions

Arrays · Sorting · Divide and Conquer

Hard

40m

Product Comparison Pairs

Arrays · Sorting · Two Pointers

Medium

30m

Longest Consecutive Sequence

+1

Arrays · Hashing

Medium

25m