algorithm-practice

LeetCode

Problem Solved: 149 (Easy: 28, Medium: 105, Hard: 16)

#	Title	Solutions	Difficulty
1	Two Sum		Easy
3	Longest Substring Without Repeating Characters		Medium
5	Longest Palindromic Substring		Medium
8	String to Integer (atoi)		Medium
11	Container With Most Water		Medium
15	3Sum		Medium
17	Letter Combinations of a Phone Number		Medium
19	Remove Nth Node From End of List		Medium
20	Valid Parentheses		Easy
21	Merge Two Sorted Lists		Easy
22	Generate Parentheses		Medium
23	Merge k Sorted Lists		Hard
24	Swap Nodes in Pairs		Medium
28	Implement strStr()		Easy
31	Next Permutation		Medium
32	Longest Valid Parentheses		Hard
33	Search in Rotated Sorted Array		Medium
34	Find First and Last Position of Element in Sorted Array		Medium
36	Valid Sudoku		Medium
38	Count and Say		Medium
39	Combination Sum		Medium
41	First Missing Positive		Hard
42	Trapping Rain Water		Hard
45	Jump Game II		Medium
49	Group Anagrams		Medium
54	Spiral Matrix		Medium
55	Jump Game		Medium
56	Merge Intervals		Medium
61	Rotate List		Medium
62	Unique Paths		Medium
67	Add Binary		Easy
68	Text Justification		Hard
71	Simplify Path		Medium
75	Sort Colors		Medium
80	Remove Duplicates from Sorted Array II		Medium
93	Restore IP Addresses		Medium
94	Binary Tree Inorder Traversal		Easy
98	Validate Binary Search Tree		Medium
102	Binary Tree Level Order Traversal		Medium
107	Binary Tree Level Order Traversal II		Medium
121	Best Time to Buy and Sell Stock		Easy
122	Best Time to Buy and Sell Stock II		Medium
127	Word Ladder		Hard
128	Longest Consecutive Sequence		Medium
131	Palindrome Partitioning		Medium
136	Single Number		Easy
141	Linked List Cycle		Easy
142	Linked List Cycle II		Medium
144	Binary Tree Preorder Traversal		Easy
145	Binary Tree Postorder Traversal		Easy
150	Evaluate Reverse Polish Notation		Medium
159	Longest Substring with At Most Two Distinct Characters		Medium
160	Intersection of Two Linked Lists		Easy
169	Majority Element		Easy
171	Excel Sheet Column Number		Easy
173	Binary Search Tree Iterator		Medium
198	House Robber		Medium
200	Number of Islands		Medium
206	Reverse Linked List		Easy
209	Minimum Size Subarray Sum		Medium
211	Design Add and Search Words Data Structure		Medium
213	House Robber II		Medium
223	Rectangle Area		Medium
224	Basic Calculator		Hard
233	Number of Digit One		Hard
236	Lowest Common Ancestor of a Binary Tree		Medium
238	Product of Array Except Self		Medium
247	Strobogrammatic Number II		Medium
249	Group Shifted Strings		Medium
252	Meeting Rooms		Easy
253	Meeting Rooms II		Medium
259	3Sum Smaller		Medium
263	Ugly Number		Easy
286	Walls and Gates		Medium
290	Word Pattern		Easy
301	Remove Invalid Parentheses		Hard
311	Sparse Matrix Multiplication		Medium
314	Binary Tree Vertical Order Traversal		Medium
322	Coin Change		Medium
329	Longest Increasing Path in a Matrix		Hard
338	Counting Bits		Easy
340	Longest Substring with At Most K Distinct Characters		Medium
347	Top K Frequent Elements		Medium
366	Find Leaves of Binary Tree		Medium
387	First Unique Character in a String		Easy
424	Longest Repeating Character Replacement		Medium
429	N-ary Tree Level Order Traversal		Medium
436	Find Right Interval		Medium
438	Find All Anagrams in a String		Medium
445	Add Two Numbers II		Medium
449	Serialize and Deserialize BST		Medium
452	Minimum Number of Arrows to Burst Balloons		Medium
520	Detect Capital		Easy
529	Minesweeper		Medium
560	Subarray Sum Equals K		Medium
567	Permutation in String		Medium
605	Can Place Flowers		Easy
621	Task Scheduler		Medium
647	Palindromic Substrings		Medium
657	Robot Return to Origin		Easy
660	Remove 9		Hard
692	Top K Frequent Words		Medium
694	Number of Distinct Islands		Medium
695	Max Area of Island		Medium
701	Insert into a Binary Search Tree		Medium
706	Design HashMap		Easy
728	Self Dividing Numbers		Easy
735	Asteroid Collision		Medium
739	Daily Temperatures		Medium
763	Partition Labels		Medium
849	Maximize Distance to Closest Person		Medium
856	Score of Parentheses		Medium
862	Shortest Subarray with Sum at Least K		Hard
875	Koko Eating Bananas		Medium
877	Stone Game		Medium
881	Boats to Save People		Medium
895	Maximum Frequency Stack		Hard
921	Minimum Add to Make Parentheses Valid		Medium
946	Validate Stack Sequences		Medium
987	Vertical Order Traversal of a Binary Tree		Hard
992	Subarrays with K Different Integers		Hard
997	Find the Town Judge		Easy
1004	Max Consecutive Ones III		Medium
1007	Minimum Domino Rotations For Equal Row		Medium
1011	Capacity To Ship Packages Within D Days		Medium
1015	Smallest Integer Divisible by K		Medium
1022	Sum of Root To Leaf Binary Numbers		Easy
1026	Maximum Difference Between Node and Ancestor		Medium
1029	Two City Scheduling		Medium
1041	Robot Bounded In Circle		Medium
1044	Longest Duplicate Substring		Hard
1091	Shortest Path in Binary Matrix		Medium
1094	Car Pooling		Medium
1100	Find K-Length Substrings With No Repeated Characters		Medium
1143	Longest Common Subsequence		Medium
1244	Design A Leaderboard		Medium
1249	Minimum Remove to Make Valid Parentheses		Medium
1288	Remove Covered Intervals		Medium
1291	Sequential Digits		Medium
1448	Count Good Nodes in Binary Tree		Medium
1472	Design Browser History		Medium
1602	Find Nearest Right Node in Binary Tree		Medium
1695	Maximum Erasure Value		Medium
1721	Swapping Nodes in a Linked List		Medium
1763	Longest Nice Substring		Easy
1838	Frequency of the Most Frequent Element		Medium
1884	Egg Drop With 2 Eggs and N Floors		Medium
1887	Reduction Operations to Make the Array Elements Equal		Medium
2024	Maximize the Confusion of an Exam		Medium