hash map Problems | Design Gurus

Data Structures

hash map

42 problems

#	Title	Acceptance	Difficulty
1	Contains Duplicate (easy) hash map hash set array +2 more	55.5%	easy
2	Pangram (easy) string array hash map +1 more	31.0%	easy
3	Valid Anagram (easy) sorting recursion hash map +1 more	38.3%	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	Problem Challenge 1: Permutation in a String (hard) sliding window string hash map +1 more	16.2%	hard
9	Problem Challenge 2: String Anagrams (hard) string hash map sliding window +2 more	29.0%	hard
10	Problem Challenge 3: Smallest Window containing Substring (hard) sliding window string hash map +1 more	20.0%	hard
11	Problem Challenge 4: Words Concatenation (hard) string hash map two pointers +2 more	23.2%	hard
12	Find all Missing Numbers (easy) array counting sorting +1 more	54.3%	easy
13	Next Greater Element (easy) stack monotonic stack array +1 more	55.3%	easy
14	Problem 1: First Non-repeating Character (easy) string hash map counting +1 more	55.3%	easy
15	Solution: First Non-repeating Character (easy) string hash map counting	0.0%	easy
16	Problem 2: Largest Unique Number (easy) hash map counting array +1 more	61.4%	easy
17	Solution: Largest Unique Number (easy) hash map counting array +1 more	0.0%	easy
18	Problem 3: Maximum Number of Balloons (easy) string hash map counting +1 more	39.7%	easy
19	Solution: Maximum Number of Balloons (easy) string hash map counting +1 more	0.0%	easy
20	Problem 4: Longest Palindrome(easy) string array hash map +1 more	24.1%	easy
21	Solution: Longest Palindrome(easy) string hash map array +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 string counting	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 hash map priority queue +1 more	55.9%	Med.
26	Frequency Sort (medium) sorting counting hash map +2 more	80.4%	Med.
27	Maximum Distinct Elements (medium) counting greedy algorithm array +1 more	22.7%	Med.
28	Rearrange String (hard) top k elements greedy algorithm heap +3 more	44.4%	hard
29	Problem Challenge 3: Frequency Stack (hard) stack hash map priority queue +2 more	40.0%	hard
30	Remove Duplicate Letters (medium) string greedy algorithm monotonic stack +3 more	18.0%	Med.
31	Largest Palindromic Number (medium) greedy algorithm string counting +1 more	15.3%	Med.
32	Index Pairs of a String (easy) string string matching trie +3 more	30.5%	easy
33	Merge Similar Items (easy) hash map sorting array +1 more	83.4%	easy
34	Maximum Size Subarray Sum Equals k (medium) prefix sum hash map array +1 more	29.0%	Med.
35	Binary Subarrays With Sum (medium) prefix sum hash map sliding window +1 more	56.6%	Med.
36	Subarray Sums Divisible by K (medium) prefix sum array hash map	50.5%	Med.
37	Subarray Sum Equals K (medium) prefix sum array hash map +1 more	45.2%	Med.
38	Two Sum (easy) hash map two pointers array +1 more	65.9%	easy
39	Valid Parentheses (easy) stack string simulation +1 more	37.9%	easy
40	Group Anagrams (medium) string hash map sorting +1 more	75.6%	Med.
41	Valid Sudoku (medium) matrix hash set hash map +2 more	35.8%	Med.
42	Clone Graph (medium) clone graph depth-first search +3 more	46.3%	Med.