Problems

3,858+ problems · 930 Easy · 2018 Medium · 910 Hard

Active:Medium· 2018 results

Title	Solution	Practice	Difficulty	Companies	Topics
2. Add Two Numbers	Solution	Solve	Medium	Accenture+37	Linked List Math+1
3. Longest Substring Without Repeating Characters	Solution	Solve	Medium	Accenture+111	Hash Table Sliding Window+1
5. Longest Palindromic Substring	Solution	Solve	Medium	Accenture+75	Dynamic Programming String+1
6. Zigzag Conversion	Solution	Solve	Medium	Amazon+18	String
7. Reverse Integer	Solution	Solve	Medium	Accenture+25	Math
8. String to Integer (atoi)	Solution	Solve	Medium	Accenture+18	String
11. Container With Most Water	Solution	Solve	Medium	Accenture+57	Array Greedy+1
12. Integer to Roman	Solution	Solve	Medium	Accenture+31	Hash Table Math+1
15. 3Sum	Solution	Solve	Medium	Accenture+60	Array Sorting+1
16. 3Sum Closest	Solution	Solve	Medium	Amazon+10	Array Sorting+1
17. Letter Combinations of a Phone Number	Solution	Solve	Medium	Accenture+39	Backtracking Hash Table+1
18. 4Sum	Solution	Solve	Medium	Accenture+18	Array Sorting+1
19. Remove Nth Node From End of List	Solution	Solve	Medium	Accenture+18	Linked List Two Pointers
22. Generate Parentheses	Solution	Solve	Medium	Accenture+39	Backtracking Dynamic Programming+1
24. Swap Nodes in Pairs	Solution	Solve	Medium	Altimetrik+15	Linked List Recursion
29. Divide Two Integers	Solution	Solve	Medium	Amazon+9	Bit Manipulation Math
31. Next Permutation	Solution	Solve	Medium	Adobe+30	Array Two Pointers
33. Search in Rotated Sorted Array	Solution	Solve	Medium	Accolite+54	Array Binary Search
34. Find First and Last Position of Element in Sorted Array	Solution	Solve	Medium	Accenture+30	Array Binary Search
36. Valid Sudoku	Solution	Solve	Medium	Adobe+29	Array Hash Table+1
38. Count and Say	Solution	Solve	Medium	Amazon+12	String
39. Combination Sum	Solution	Solve	Medium	Airbnb+29	Array Backtracking
40. Combination Sum II	Solution	Solve	Medium	Adobe+16	Array Backtracking
43. Multiply Strings	Solution	Solve	Medium	Amazon+16	Math Simulation+1
45. Jump Game II	Solution	Solve	Medium	Adobe+27	Array Dynamic Programming+1
46. Permutations	Solution	Solve	Medium	Adobe+25	Array Backtracking
47. Permutations II	Solution	Solve	Medium	Amazon+8	Array Backtracking
48. Rotate Image	Solution	Solve	Medium	Accenture+36	Array Math+1
49. Group Anagrams	Solution	Solve	Medium	Accolite+90	Array Hash Table+2
50. Pow(x, n)	Solution	Solve	Medium	Accenture+22	Math Recursion
53. Maximum Subarray	Solution	Solve	Medium	Accenture+65	Array Divide and Conquer+1
54. Spiral Matrix	Solution	Solve	Medium	Accenture+52	Array Matrix+1
55. Jump Game	Solution	Solve	Medium	Adobe+33	Array Dynamic Programming+1
56. Merge Intervals	Solution	Solve	Medium	Accenture+108	Array Sorting
57. Insert Interval	Solution	Solve	Medium	Amazon+15	Array
59. Spiral Matrix II	Solution	Solve	Medium	Adobe+8	Array Matrix+1
61. Rotate List	Solution	Solve	Medium	Amazon+11	Linked List Two Pointers
62. Unique Paths	Solution	Solve	Medium	Accenture+21	Combinatorics Dynamic Programming+1
63. Unique Paths II	Solution	Solve	Medium	Agoda+11	Array Dynamic Programming+1
64. Minimum Path Sum	Solution	Solve	Medium	Amazon+16	Array Dynamic Programming+1
71. Simplify Path	Solution	Solve	Medium	Amazon+24	Stack String
72. Edit Distance	Solution	Solve	Medium	Accenture+30	Dynamic Programming String
73. Set Matrix Zeroes	Solution	Solve	Medium	Amazon+23	Array Hash Table+1
74. Search a 2D Matrix	Solution	Solve	Medium	Accenture+18	Array Binary Search+1
75. Sort Colors	Solution	Solve	Medium	Adobe+33	Array Sorting+1
77. Combinations	Solution	Solve	Medium	Amazon+6	Backtracking
78. Subsets	Solution	Solve	Medium	Adobe+19	Array Backtracking+1
79. Word Search	Solution	Solve	Medium	Accenture+39	Array Backtracking+2
80. Remove Duplicates from Sorted Array II	Solution	Solve	Medium	Accolite+11	Array Two Pointers
81. Search in Rotated Sorted Array II	Solution	Solve	Medium	Accenture+9	Array Binary Search