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67 questions
Interview frequency breakdown: 30-day, 3-month, 6-month & all-time
10 Easy
44 Med
13 Hard
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67
questions
#56
Merge Intervals
Medium
array
NeetCode
100% Freq
30d
#146
LRU Cache
Medium
hash table
NeetCode
100% Freq
#1215
Stepping Numbers
Medium
math
WalkCCC
100% Freq
3m
#2232
Minimize Result by Adding Parentheses to Expression
Medium
string
WalkCCC
100% Freq
3m
#1909
Remove One Element to Make the Array Strictly Increasing
Easy
array
WalkCCC
98% Freq
#2544
Alternating Digit Sum
Easy
math
WalkCCC
92% Freq
#416
Partition Equal Subset Sum
Medium
array
NeetCode
89% Freq
#572
Subtree of Another Tree
Easy
tree
NeetCode
89% Freq
#727
Minimum Window Subsequence
Hard
string
WalkCCC
89% Freq
#868
Binary Gap
Easy
bit manipulation
WalkCCC
89% Freq
#1206
Design Skiplist
Hard
linked list
WalkCCC
89% Freq
#1877
Minimize Maximum Pair Sum in Array
Medium
array
WalkCCC
89% Freq
#54
Spiral Matrix
Medium
array
NeetCode
88% Freq
#1
Two Sum
Easy
array
NeetCode
86% Freq
#200
Number of Islands
Medium
array
NeetCode
85% Freq
#347
Top K Frequent Elements
Medium
array
NeetCode
82% Freq
#4
Median of Two Sorted Arrays
Hard
array
NeetCode
81% Freq
6m
#221
Maximal Square
Medium
array
WalkCCC
81% Freq
6m
#493
Reverse Pairs
Hard
array
WalkCCC
81% Freq
6m
#1197
Minimum Knight Moves
Medium
breadth first search
WalkCCC
81% Freq
6m
#3208
Alternating Groups II
Medium
array
WalkCCC
81% Freq
6m
#50
Pow(x, n)
Medium
math
NeetCode
80% Freq
#73
Set Matrix Zeroes
Medium
array
NeetCode
80% Freq
#5
Longest Palindromic Substring
Medium
two pointers
NeetCode
74% Freq
#473
Matchsticks to Square
Medium
array
NeetCode
74% Freq
#905
Sort Array By Parity
Easy
array
WalkCCC
74% Freq
#968
Binary Tree Cameras
Hard
dynamic programming
WalkCCC
74% Freq
#981
Time Based Key-Value Store
Medium
hash table
NeetCode
74% Freq
#3
Longest Substring Without Repeating Characters
Medium
hash table
NeetCode
67% Freq
#20
Valid Parentheses
Easy
string
NeetCode
67% Freq
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