DSA Blind 100

1 Sum of array elements Easy DSA — Arrays 2 Find maximum in array Easy DSA — Arrays 3 Reverse an array in-place Medium DSA — Arrays 4 Count occurrences of element Easy DSA — Arrays 5 Second largest element Medium DSA — Arrays 6 Two Sum — indices for target 8 #1 Easy DSA — Arrays 7 Maximum subarray sum (Kadane) #2 Medium DSA — Arrays 8 Rotate array right by 3 #3 Medium DSA — Arrays 9 Product of array except self #4 Medium DSA — Arrays 10 Product of array except self #5 Medium DSA — Arrays 11 Product of array except self #6 Medium DSA — Arrays 12 Product of array except self #7 Medium DSA — Arrays 13 Product of array except self #8 Medium DSA — Arrays 14 Product of array except self #9 Medium DSA — Arrays 15 Product of array except self #10 Medium DSA — Arrays 16 Sum of array elements Easy DSA — Hashing 17 Find maximum in array Easy DSA — Hashing 18 Reverse an array in-place Medium DSA — Hashing 19 Count occurrences of element Easy DSA — Hashing 20 Second largest element Medium DSA — Hashing 21 First duplicate in array #1 Easy DSA — Hashing 22 First duplicate in array #2 Easy DSA — Hashing 23 First duplicate in array #3 Easy DSA — Hashing 24 First duplicate in array #4 Easy DSA — Hashing 25 First duplicate in array #5 Easy DSA — Hashing

1 Sum of array elements Easy DSA — Two Pointers 2 Find maximum in array Easy DSA — Two Pointers 3 Reverse an array in-place Medium DSA — Two Pointers 4 Count occurrences of element Easy DSA — Two Pointers 5 Second largest element Medium DSA — Two Pointers 6 Container with most water #1 Medium DSA — Two Pointers 7 Container with most water #2 Medium DSA — Two Pointers 8 Container with most water #3 Medium DSA — Two Pointers 9 Container with most water #4 Medium DSA — Two Pointers 10 Container with most water #5 Medium DSA — Two Pointers 11 Sum of array elements Easy DSA — Strings 12 Find maximum in array Easy DSA — Strings 13 Reverse an array in-place Medium DSA — Strings 14 Count occurrences of element Easy DSA — Strings 15 Second largest element Medium DSA — Strings 16 Valid palindrome "leetcode" #1 Easy DSA — Strings 17 Longest substring without repeat #2 Medium DSA — Strings 18 Anagram check #3 Easy DSA — Strings 19 Valid palindrome "interview" #4 Easy DSA — Strings 20 Longest substring without repeat #5 Medium DSA — Strings

1 Sum of array elements Easy DSA — Stacks & Queues 2 Find maximum in array Easy DSA — Stacks & Queues 3 Reverse an array in-place Medium DSA — Stacks & Queues 4 Count occurrences of element Easy DSA — Stacks & Queues 5 Second largest element Medium DSA — Stacks & Queues 6 Valid parentheses depth #1 Easy DSA — Stacks & Queues 7 Queue — simulate task scheduler #2 Medium DSA — Stacks & Queues 8 Valid parentheses depth #3 Easy DSA — Stacks & Queues 9 Queue — simulate task scheduler #4 Medium DSA — Stacks & Queues 10 Valid parentheses depth #5 Easy DSA — Stacks & Queues 11 Sum of array elements Easy DSA — Binary Search 12 Find maximum in array Easy DSA — Binary Search 13 Reverse an array in-place Medium DSA — Binary Search 14 Count occurrences of element Easy DSA — Binary Search 15 Second largest element Medium DSA — Binary Search 16 Binary search index of 5 #1 Easy DSA — Binary Search 17 Binary search index of 6 #2 Easy DSA — Binary Search 18 Binary search index of 7 #3 Easy DSA — Binary Search 19 Binary search index of 8 #4 Easy DSA — Binary Search 20 Binary search index of 9 #5 Easy DSA — Binary Search

1 Sum of array elements Easy DSA — Trees 2 Find maximum in array Easy DSA — Trees 3 Reverse an array in-place Medium DSA — Trees 4 Count occurrences of element Easy DSA — Trees 5 Second largest element Medium DSA — Trees 6 BST — inorder traversal sum #1 Medium DSA — Trees 7 BST — inorder traversal sum #2 Medium DSA — Trees 8 BST — inorder traversal sum #3 Medium DSA — Trees 9 BST — inorder traversal sum #4 Medium DSA — Trees 10 BST — inorder traversal sum #5 Medium DSA — Trees 11 BST — inorder traversal sum #6 Medium DSA — Trees 12 BST — inorder traversal sum #7 Medium DSA — Trees 13 Sum of array elements Easy DSA — Graphs 14 Find maximum in array Easy DSA — Graphs 15 Reverse an array in-place Medium DSA — Graphs 16 Count occurrences of element Easy DSA — Graphs 17 Second largest element Medium DSA — Graphs 18 BFS shortest path in grid #1 Medium DSA — Graphs 19 BFS shortest path in grid #2 Medium DSA — Graphs 20 BFS shortest path in grid #3 Medium DSA — Graphs 21 Sum of array elements Easy DSA — Dynamic Programming 22 Find maximum in array Easy DSA — Dynamic Programming 23 Reverse an array in-place Medium DSA — Dynamic Programming 24 Count occurrences of element Easy DSA — Dynamic Programming 25 Second largest element Medium DSA — Dynamic Programming 26 Fibonacci 5 (DP) #1 Easy DSA — Dynamic Programming 27 Climbing stairs 6 steps #2 Easy DSA — Dynamic Programming 28 Fibonacci 7 (DP) #3 Easy DSA — Dynamic Programming 29 Climbing stairs 8 steps #4 Easy DSA — Dynamic Programming 30 Fibonacci 9 (DP) #5 Easy DSA — Dynamic Programming 31 Climbing stairs 10 steps #6 Easy DSA — Dynamic Programming 32 Fibonacci 11 (DP) #7 Easy DSA — Dynamic Programming 33 Climbing stairs 12 steps #8 Easy DSA — Dynamic Programming 34 Fibonacci 5 (DP) #9 Easy DSA — Dynamic Programming 35 Climbing stairs 6 steps #10 Easy DSA — Dynamic Programming