hash map Problems | Design Gurus

Data Structures

hash map

38 problems

#	Title	Acceptance	Difficulty
1	Contains Duplicate (easy) hash map hash set array +1 more	55.5%	easy
2	Pangram (easy) string hash map hashing +1 more	31.1%	easy
3	Valid Anagram (easy) string hash map sorting +2 more	38.4%	easy
4	Number of Good Pairs (easy) array counting hash map	75.4%	easy
5	Problem Challenge 1: Quadruple Sum to Target (medium) sorting two pointers recursion +1 more	17.3%	Med.
6	Happy Number (medium) recursion linked list hash map	47.2%	Med.
7	Longest Substring with K Distinct Characters (medium) sliding window string hash map +1 more	28.0%	Med.
8	Fruits into Baskets (medium) sliding window two pointers array +1 more	39.5%	Med.
9	Problem Challenge 1: Permutation in a String (hard) string sliding window hash map +1 more	16.3%	hard
10	Problem Challenge 2: String Anagrams (hard) string hash map sliding window +1 more	29.1%	hard
11	Problem Challenge 4: Words Concatenation (hard) string hash map array +3 more	23.2%	hard
12	Find the Duplicate Number (easy) array hash map	49.2%	easy
13	Problem Challenge 1: Find the Corrupt Pair (easy) sorting array counting +1 more	48.1%	easy
14	Next Greater Element (easy) stack monotonic stack array +1 more	55.4%	easy
15	Problem 1: First Non-repeating Character (easy) string hash map counting	55.3%	easy
16	Solution: First Non-repeating Character (easy) hash map string counting +1 more	0.0%	easy
17	Problem 2: Largest Unique Number (easy) hash map counting array +1 more	61.4%	easy
18	Solution: Largest Unique Number (easy) hash map counting array +1 more	0.0%	easy
19	Problem 3: Maximum Number of Balloons (easy) string counting hash map	39.7%	easy
20	Solution: Maximum Number of Balloons (easy) hash map counting string	0.0%	easy
21	Solution: Longest Palindrome (easy) hash map counting string +1 more	0.0%	easy
22	Problem 5: Ransom Note (easy) string hash map counting +1 more	56.7%	easy
23	Solution: Ransom Note (easy) hash map counting string +1 more	0.0%	easy
24	Single Number (easy) array hash map hash set +3 more	82.6%	easy
25	Top 'K' Frequent Numbers (medium) top k elements sorting array +2 more	55.9%	Med.
26	Frequency Sort (medium) sorting counting hash map +2 more	80.5%	Med.
27	Maximum Distinct Elements (medium) greedy algorithm hash map array	22.7%	Med.
28	Problem Challenge 3: Frequency Stack (hard) stack hash map priority queue +2 more	40.0%	hard
29	Largest Palindromic Number (medium) greedy algorithm backtracking string matching +3 more	15.3%	Med.
30	Index Pairs of a String (easy) string string matching trie +3 more	30.5%	easy
31	Merge Similar Items (easy) hash map sorting array +1 more	83.4%	easy
32	Maximum Size Subarray Sum Equals k (medium) prefix sum hash map array +1 more	29.0%	Med.
33	Subarray Sums Divisible by K (medium) prefix sum hash map array +1 more	50.5%	Med.
34	Subarray Sum Equals K (medium) prefix sum array hash map +1 more	45.2%	Med.
35	Two Sum (easy) hash map two pointers array +1 more	65.9%	easy
36	Valid Parentheses (easy) stack string simulation +1 more	38.0%	easy
37	Group Anagrams (medium) string hash map sorting +1 more	75.6%	Med.
38	Valid Sudoku (medium) matrix hash set hash map +2 more	35.8%	Med.