Grind 75 Questions

1

Two Sum

Easy·15 mins

2

Valid Parentheses

Easy·20 mins

3

Merge Two Sorted Lists

Easy·20 mins

4

Best Time to Buy and Sell Stock

Easy·20 mins

5

Valid Palindrome

Easy·15 mins

6

Invert Binary Tree

Easy·15 mins

7

Valid Anagram

Easy·15 mins

8

Binary Search

Easy·15 mins

9

Flood Fill

Easy·20 mins

10

Lowest Common Ancestor of a Binary Search Tree

Easy·20 mins

11

Balanced Binary Tree

Easy·15 mins

12

Linked List Cycle

Easy·20 mins

13

Implement Queue using Stacks

Easy·20 mins

Week 2

0 / 12

1

First Bad Version

Easy·20 mins

2

Ransom Note

Easy·15 mins

3

Climbing Stairs

Easy·20 mins

4

Longest Palindrome

Easy·20 mins

5

Reverse Linked List

Easy·20 mins

6

Majority Element

Easy·20 mins

7

Add Binary

Easy·15 mins

8

Diameter of Binary Tree

Easy·30 mins

9

Middle of the Linked List

Easy·20 mins

10

Maximum Depth of Binary Tree

Easy·15 mins

11

Contains Duplicate

Easy·15 mins

12

Maximum Subarray

Medium·20 mins

Week 3

0 / 8

1

Insert Interval

Medium·25 mins

2

01 Matrix

Medium·30 mins

3

K Closest Points to Origin

Medium·30 mins

4

Longest Substring Without Repeating Characters

Medium·30 mins

5

3Sum

Medium·30 mins

6

Binary Tree Level Order Traversal

Medium·20 mins

7

Clone Graph

Medium·25 mins

8

Evaluate Reverse Polish Notation

Medium·30 mins

Week 4

0 / 8

1

Course Schedule

Medium·30 mins

2

Implement Trie (Prefix Tree)

Medium·35 mins

3

Coin Change

Medium·25 mins

4

Product of Array Except Self

Medium·30 mins

5

Min Stack

Medium·20 mins

6

Validate Binary Search Tree

Medium·20 mins

7

Number of Islands

Medium·25 mins

8

Rotting Oranges

Medium·30 mins

Week 5

0 / 8

1

Search in Rotated Sorted Array

Medium·30 mins

2

Combination Sum

Medium·30 mins

3

Permutations

Medium·30 mins

4

Merge Intervals

Medium·30 mins

5

Lowest Common Ancestor of a Binary Tree

Medium·25 mins

6

Time Based Key-Value Store

Medium·35 mins

7

Accounts Merge

Medium·30 mins

8

Sort Colors

Medium·25 mins

Week 6

0 / 9

1

Word Break

Medium·30 mins

2

Partition Equal Subset Sum

Medium·30 mins

3

String to Integer (atoi)

Medium·25 mins

4

Spiral Matrix

Medium·25 mins

5

Subsets

Medium·30 mins

6

Binary Tree Right Side View

Medium·20 mins

7

Longest Palindromic Substring

Medium·25 mins

8

Unique Paths

Medium·20 mins

9

Construct Binary Tree from Preorder and Inorder Traversal

Medium·25 mins

Week 7

0 / 7

1

Container With Most Water

Medium·35 mins

2

Letter Combinations of a Phone Number

Medium·30 mins

3

Word Search

Medium·30 mins

4

Find All Anagrams in a String

Medium·30 mins

5

Minimum Height Trees

Medium·30 mins

6

Task Scheduler

Medium·35 mins

7

LRU Cache

Medium·30 mins

Week 8

0 / 10

1

Kth Smallest Element in a BST

Medium·25 mins

2

Minimum Window Substring

Hard·30 mins

3

Serialize and Deserialize Binary Tree

Hard·40 mins

4

Trapping Rain Water

Hard·35 mins

5

Find Median from Data Stream

Hard·30 mins

6

Word Ladder

Hard·45 mins

7

Basic Calculator

Hard·40 mins

8

Maximum Profit in Job Scheduling

Hard·45 mins

9

Merge k Sorted Lists

Hard·30 mins

10

Largest Rectangle in Histogram

Hard·35 mins