problem solving

Num	Question	Difficulty	Solution
1	1. Two Sum	$\color{Green}Easy$	Link
2	3. Longest Substring Without Repeating Characters	$\color{Orange}Medium$	Link
3	7. Reverse Integer	$\color{Orange}Medium$	Link
4	9. Palindrome Number	$\color{Green}Easy$	Link
5	12. Integer to Roman	$\color{Orange}Medium$	Link
6	13. Roman to Integer	$\color{Green}Easy$	Link
7	14. Longest Common Prefix	$\color{Green}Easy$	Link
8	20. Valid Parentheses	$\color{Green}Easy$	Link
9	26. Remove Duplicates from Sorted Array	$\color{Green}Easy$	Link
10	27. Remove Element	$\color{Green}Easy$	Link
11	28. Find the Index of the First Occurrence in a String	$\color{Green}Easy$	Link
12	33. Search in Rotated Sorted Array	$\color{Orange}Medium$	Link
13	34. Find First and Last Position of Element in Sorted Array	$\color{Orange}Medium$	Link
14	35. Search Insert Position	$\color{Green}Easy$	Link
15	36. Valid Sudoku	$\color{Orange}Medium$	Link
16	49. Group Anagrams	$\color{Orange}Medium$	Link
17	50. Pow(x, n)	$\color{Orange}Medium$	Link
18	58. Length of Last Word	$\color{Green}Easy$	Link
19	66. Plus One	$\color{Green}Easy$	Link
20	67. Add Binary	$\color{Green}Easy$	Link
21	69. Sqrt(x)	$\color{Green}Easy$	Link
22	74. Search a 2D Matrix	$\color{Orange}Medium$	Link
23	83. Remove Duplicates from Sorted List	$\color{Green}Easy$	Link
24	88. Merge Sorted Array	$\color{Green}Easy$	Link
25	118. Pascal's Triangle	$\color{Green}Easy$	Link
26	119. Pascal's Triangle II	$\color{Green}Easy$	Link
27	121. Best Time to Buy and Sell Stock	$\color{Green}Easy$	Link
28	125. Valid Palindrome	$\color{Green}Easy$	Link
29	128. Longest Consecutive Sequence	$\color{Orange}Medium$	Link
30	136. Single Number	$\color{Green}Easy$	Link
31	150. Evaluate Reverse Polish Notation	$\color{Orange}Medium$	Link
32	167. Two Sum II - Input Array Is Sorted	$\color{Orange}Medium$	Link
33	169. Majority Element	$\color{Green}Easy$	Link
34	202. Happy Number	$\color{Green}Easy$	Link
35	205. Isomorphic Strings	$\color{Green}Easy$	Link
36	206. Reverse Linked List	$\color{Green}Easy$	Link
37	217. Contains Duplicate	$\color{Green}Easy$	Link
38	225. Implement Stack using Queues	$\color{Green}Easy$	Link
39	228. Summary Ranges	$\color{Green}Easy$	Link
40	229. Majority Element II	$\color{Orange}Medium$	Link
41	231. Power of Two	$\color{Green}Easy$	Link
42	238. Product of Array Except Self	$\color{Orange}Medium$	Link
43	242. Valid Anagram	$\color{Green}Easy$	Link
44	258. Add Digits	$\color{Green}Easy$	Link
45	268. Missing Number	$\color{Green}Easy$	Link
46	278. First Bad Version	$\color{Green}Easy$	Link
47	283. Move Zeroes	$\color{Green}Easy$	Link
48	287. Find the Duplicate Number	$\color{Orange}Medium$	Link
49	290. Word Pattern	$\color{Green}Easy$	Link
50	326. Power of Three	$\color{Green}Easy$	Link
51	342. Power of Four	$\color{Green}Easy$	Link
52	344. Reverse String	$\color{Green}Easy$	Link
53	347. Top K Frequent Elements	$\color{Orange}Medium$	Link
54	349. Intersection of Two Arrays	$\color{Green}Easy$	Link
55	380. Insert Delete GetRandom O(1).md	$\color{Orange}Medium$	Link
56	383. Ransom Note	$\color{Green}Easy$	Link
57	387. First Unique Character in a String	$\color{Green}Easy$	Link
58	389. Find the Difference	$\color{Green}Easy$	Link
59	392. Is Subsequence	$\color{Green}Easy$	Link
60	412. Fizz Buzz	$\color{Green}Easy$	Link
61	415. Add Strings	$\color{Green}Easy$	Link
62	459. Repeated Substring Pattern	$\color{Green}Easy$	Link
63	463. Island Perimeter	$\color{Green}Easy$	Link
64	496. Next Greater Element I	$\color{Green}Easy$	Link
65	520. Detect Capital	$\color{Green}Easy$	Link
66	557. Reverse Words in a String III	$\color{Green}Easy$	Link
67	567. Permutation in String	$\color{Orange}Medium$	Link
68	581. Shortest Unsorted Continuous Subarray	$\color{Orange}Medium$	Link
69	595. Big Countries	$\color{Orange}Medium$	Link
70	609. Find Duplicate File in System	$\color{Orange}Medium$	Link
71	657. Robot Return to Origin	$\color{Green}Easy$	Link
72	682. Baseball Game	$\color{Green}Easy$	Link
73	704. Binary Search	$\color{Green}Easy$	Link
74	706. Design HashMap	$\color{Green}Easy$	Link
75	709. To Lower Case	$\color{Green}Easy$	Link
76	724. Find Pivot Index	$\color{Green}Easy$	Link
77	771. Jewels and Stones	$\color{Green}Easy$	Link
78	844. Backspace String Compare	$\color{Green}Easy$	Link
79	896. Monotonic Array	$\color{Green}Easy$	Link
80	912. Sort an Array	$\color{Orange}Medium$	Link
81	917. Reverse Only Letters	$\color{Green}Easy$	Link
82	981. Time Based Key-Value Store	$\color{Orange}Medium$	Link
83	1021. Remove Outermost Parentheses	$\color{Green}Easy$	Link
84	1048. Longest String Chain	$\color{Orange}Medium$	Link
85	1089. Duplicate Zeros	$\color{Green}Easy$	Link
86	1108. Defanging an IP Address	$\color{Green}Easy$	Link
87	1207. Unique Number of Occurrences	$\color{Green}Easy$	Link
88	1275. Find Winner on a Tic Tac Toe Game	$\color{Green}Easy$	Link
89	1299. Replace Elements with Greatest Element on Right Side	$\color{Green}Easy$	Link
90	1337. The K Weakest Rows in a Matrix	$\color{Green}Easy$	Link
91	1347. Minimum Number of Steps to Make Two Strings Anagram	$\color{Orange}Medium$	Link
92	1365. How Many Numbers Are Smaller Than the Current Number	$\color{Green}Easy$	Link
93	1380. Lucky Numbers in a Matrix	$\color{Green}Easy$	Link
94	1464. Maximum Product of Two Elements in an Array	$\color{Green}Easy$	Link
95	1480. Running Sum of 1d Array	$\color{Green}Easy$	Link
96	1491. Average Salary Excluding the Minimum and Maximum Salary	$\color{Green}Easy$	Link
97	1496. Path Crossing	$\color{Green}Easy$	Link
98	1502. Can Make Arithmetic Progression From Sequence	$\color{Green}Easy$	Link
99	1512. Number of Good Pairs	$\color{Green}Easy$	Link
100	1523. Count Odd Numbers in an Interval Range	$\color{Green}Easy$	Link
101	1535. Find the Winner of an Array Game	$\color{Orange}Medium$	Link
102	1572. Matrix Diagonal Sum	$\color{Green}Easy$	Link
103	1603. Design Parking System	$\color{Green}Easy$	Link
104	1657. Determine if Two Strings Are Close	$\color{Orange}Medium$	Link
105	1704. Determine if String Halves Are Alike	$\color{Green}Easy$	Link
106	1757. Recyclable and Low Fat Products	$\color{Green}Easy$	Link
107	1768. Merge Strings Alternately	$\color{Green}Easy$	Link
108	1773. Count Items Matching a Rule	$\color{Green}Easy$	Link
109	1822. Sign of the Product of an Array	$\color{Green}Easy$	Link
110	1845. Seat Reservation Manager	$\color{Orange}Medium$	Link
111	1920. Build Array from Permutation	$\color{Green}Easy$	Link
112	1929. Concatenation of Array	$\color{Green}Easy$	Link
113	2129. Capitalize the Title	$\color{Green}Easy$	Link
114	2215. Find the Difference of Two Arrays	$\color{Green}Easy$	Link
115	2225. Find Players With Zero or One Losses	$\color{Orange}Medium$	Link
116	2460. Apply Operations to an Array	$\color{Green}Easy$	Link
117	2610. Convert an Array Into a 2D Array With Conditions	$\color{Orange}Medium$	Link
118	2785. Sort Vowels in a String	$\color{Orange}Medium$	Link
119	2904. Shortest and Lexicographically Smallest Beautiful String	$\color{Orange}Medium$	Link