Interview Problems

Practice coding problems with detailed solutions and explanations

Ranking	Problem	Difficulty	Companies	Topics	Frequency
#1	Two Sum	Easy	+6 more	Array Tabla Hash	95%
#3	Best Time to Buy and Sell Stock	Easy	+6 more	Array Programación Dinámica	87%
#4	Merge Two Sorted Lists	Easy	+6 more	Lista Enlazada Recursión	84%
#5	Valid Anagram	Easy	+6 more	Tabla Hash Cadena +1 more	82%
#6	Binary Search	Easy	+6 more	Array Búsqueda Binaria	80%
#7	Reverse Linked List	Easy	+6 more	Lista Enlazada Recursión	78%
#8	Contains Duplicate	Easy	+6 more	Array Tabla Hash +1 more	76%
#9	Maximum Subarray	Medium	+6 more	Array Divide y Vencerás +1 more	74%
#10	3Sum	Medium	+6 more	Array Dos Punteros +1 more	72%
#11	Climbing Stairs	Easy	+6 more	Matemáticas Programación Dinámica +1 more	70%
#12	Longest Palindromic Substring	Medium	+6 more	Cadena Programación Dinámica	68%
#13	Product of Array Except Self	Medium	+6 more	Array Suma de Prefijos	66%
#14	Group Anagrams	Medium	+6 more	Array Tabla Hash +2 more	64%
#15	Top K Frequent Elements	Medium	+6 more	Array Tabla Hash +6 more	62%
#16	Palindromic Substrings	Medium	+4 more	Cadena Programación Dinámica	68%
#17	Course Schedule	Medium	+5 more	Búsqueda en Profundidad Búsqueda en Amplitud +2 more	75%
#18	House Robber	Medium	+5 more	Array Programación Dinámica	82%
#19	Meeting Rooms II	Medium	+6 more	Array Dos Punteros +3 more	88%
#20	Implement Trie (Prefix Tree)	Medium	+6 more	Tabla Hash Cadena +2 more	79%
#22	Word Search	Medium	+6 more	Array Backtracking +1 more	77%
#23	Subarray Sum Equals K	Medium	+6 more	Array Tabla Hash +1 more	81%
#25	Decode Ways	Medium	+6 more	Cadena Programación Dinámica	69%
#27	Kth Largest Element in an Array	Medium	+6 more	Array Divide y Vencerás +3 more	91%
#28	Combination Sum	Medium	+6 more	Array Backtracking	78%
#29	Number of Islands	Medium	+6 more	Array Búsqueda en Profundidad +3 more	89%
#30	Longest Substring Without Repeating Characters	Medium	+6 more	Tabla Hash Cadena +1 more	93%

Interview Problems

Two Sum

Best Time to Buy and Sell Stock

Merge Two Sorted Lists

Valid Anagram

Binary Search

Reverse Linked List

Contains Duplicate

Maximum Subarray

3Sum

Climbing Stairs

Longest Palindromic Substring

Product of Array Except Self

Group Anagrams

Top K Frequent Elements

Palindromic Substrings

Course Schedule

House Robber

Meeting Rooms II

Implement Trie (Prefix Tree)

Word Search

Subarray Sum Equals K

Decode Ways

Kth Largest Element in an Array

Combination Sum

Number of Islands

Longest Substring Without Repeating Characters