Algo Practice

This project keeps track of my algo practice history

Leetcode Practice History

Number	Title	Solution	Difficulty	Note
1167	Minimum Cost to Connect Sticks	Python	Medium	Greedy
1108	Defanging an IP Address	Swift	Easy	-
983	Minimum Cost For Tickets	Python	Medium
973	K Closest Points to Origin	Python	Medium	-
937	Reorder Data in Log Files	Python	Easy	Amazon
905	Sort Array By Parity	Python	Easy	-
677	Map Sum Pairs	Python	Medium	Trie
662	Maximum Width of Binary Tree	Swift	Medium	-
657	Robot Return to Origin	Swift	Easy	`
648	Replace Words	Python	Medium	Trie
647	Palindromic Substrings	Python	Medium	-
560	Subarray Sum Equals K	Swift	Medium	-
510	Inorder Successor in BST II	Swift	Medium	-
437	Path Sum III	Swift	Medium	-
435	Non-overlapping Intervals	Python	Medium	-
409	Longest Palindrome	Python	Easy	-
404	Sum of Left Leaves	Python	Easy	-
374	Guess Number Higher or Lower	Python	Easy	-
297	Serialize and Deserialize Binary Tree	Swift Python	Hard	Tree
278	First Bad Version	Python	Easy	-
257	Binary Tree Paths	Swift	Easy	-
253	Meeting Rooms II	Python	Medium	-
235	Lowest Common Ancestor of a Binary Search Tree	Swift	Easy	-
229	Majority Element II	Swift	Medium	-
226	Invert Binary Tree	Python	Easy	-
210	Course Schedule II	Python	Medium	Topological Sort
200	Number of Islands	Python	Medium	-
171	Excel Sheet Column Number	Python	Easy	-
169	Majority Element	Python	Easy	-
162	Find Peak Element	Python	Medium	Review needed
155	Min Stack	Swift	Easy	-
131	Palindorm Partitioning	Python	Medium	Backtracking
129	Sum Root to Leaf Numbers	Python Swift	Medium	Tree
128	Longest Consecutive Sequence	Python	Hard	-
125	Valid Palindrome	Python	Easy	-
113	Path Sum II	Swift	Medium	-
110	Balanced Binary Tree	Swift	Easy	-
101	Symmetric Tree	Swift	Medium	-
100	Same Tree	Swift	Easy	-
78	Subsets	Swift	Medium	Backtracking
67	Add Binary	Python	Easy	-
64	Minimum Path Sum	Python	Medium	-
58	Length of Last Word	Python	Easy	-
57	Insert Interval	Python	Hard	13/09/2020
53	Maximum Subarray	Swift	Easy	-
49	Group Anagram	Swift Python	Medium	-
48	Rotate Image	Python	Medium	-
46	Permutations	Swift	Medium	Backtracking question general approach
39	Combination Sum	Swift	Medium	Backtracking
34	Find First and Last Position of Element in Sorted Array	Python	Medium	Binary search ❤️
33	Search in Rotated Sorted Array	Python	Medium	Binary search ❤️
26	Remove Duplicates from Sorted Array	Swift Python	Easy	-
23	Merge k Sorted Lists	Python	Hard	-
19	Remove Nth Node From End of List	Swift	Medium	-
18	4Sum	Swift	Medium	-
17	Letter Combinations of a Phone Number	Swift	Medium	-
15	3Sum	Swift	medium	-
14	Longest Common Prefix	Swift	Easy	Review needed
13	Roman to Integer	Swift	Easy	-
11	Container With Most Water	Swift	Medium	-
9	Palindrome Number	Swift	Easy	-
5	Longest Palindromic Substring	Python	Medium	-
3	Longest Substring Without Repeating Characters	Swift	Medium	-
2	Add Two Numbers	Swift Python	Medium	Amazon
1	Two Sum	Swift	Easy	Amazon

Misc

Title	Solution	Note
Merge Sort	Swift	Top down approach
Trie	Python	Dictionary
Heap	Swift	-

Learning Resources

Binary Search

Powerful Ultimate Binary Search Template. Solved many problems

Graph

Graph For Beginners Problems or Pattern or Sample Solutions

Cracking the coding interview

https://github.com/ahujaraman/cracking-the-coding-interview