Easy LeetCode Problems in Python with Tests

All 309 Easy LeetCode problems with tested Python solutions. Part 1 of 2: problems 1-200.

Easy holds 309 problems.

#	Problem	Difficulty	Solution
1	Two Sum	Easy	solution.py
9	Palindrome Number	Easy	solution.py
13	Roman to Integer	Easy	solution.py
14	Longest Common Prefix	Easy	solution.py
20	Valid Parentheses	Easy	solution.py
21	Merge Two Sorted Lists	Easy	solution.py
26	Remove Duplicates From Sorted Array	Easy	solution.py
27	Remove Element	Easy	solution.py
28	Find the Index of the First Occurrence in a String	Easy	solution.py
35	Search Insert Position	Easy	solution.py
58	Length of Last Word	Easy	solution.py
66	Plus One	Easy	solution.py
67	Add Binary	Easy	solution.py
69	Sqrt(x)	Easy	solution.py
70	Climbing Stairs	Easy	solution.py
83	Remove Duplicates from Sorted List	Easy	solution.py
88	Merge Sorted Array	Easy	solution.py
94	Binary Tree Inorder Traversal	Easy	solution.py
100	Same Tree	Easy	solution.py
101	Symmetric Tree	Easy	solution.py
104	Maximum Depth of Binary Tree	Easy	solution.py
108	Convert Sorted Array to Binary Search Tree	Easy	solution.py
110	Balanced Binary Tree	Easy	solution.py
111	Minimum Depth of Binary Tree	Easy	solution.py
112	Path Sum	Easy	solution.py
118	Pascal’s Triangle	Easy	solution.py
119	Pascal’s Triangle II	Easy	solution.py
121	Best Time to Buy and Sell Stock	Easy	solution.py
125	Valid Palindrome	Easy	solution.py
136	Single Number	Easy	solution.py
141	Linked List Cycle	Easy	solution.py
144	Binary Tree Preorder Traversal	Easy	solution.py
145	Binary Tree Postorder Traversal	Easy	solution.py
157	Read N Characters Given Read4	Easy	solution.py
160	Intersection of Two Linked Lists	Easy	solution.py
163	Missing Ranges	Easy	solution.py
168	Excel Sheet Column Title	Easy	solution.py
169	Majority Element	Easy	solution.py
170	Two Sum III - Data structure design	Easy	solution.py
171	Excel Sheet Column Number	Easy	solution.py
190	Reverse Bits	Easy	solution.py
191	Number of 1 Bits	Easy	solution.py
202	Happy Number	Easy	solution.py
203	Remove Linked List Elements	Easy	solution.py
205	Isomorphic Strings	Easy	solution.py
206	Reverse Linked List	Easy	solution.py
217	Contains Duplicate	Easy	solution.py
219	Contains Duplicate II	Easy	solution.py
225	Implement Stack using Queues	Easy	solution.py
226	Invert Binary Tree	Easy	solution.py
228	Summary Ranges	Easy	solution.py
231	Power of Two	Easy	solution.py
232	Implement Queue using Stacks	Easy	solution.py
234	Palindrome Linked List	Easy	solution.py
242	Valid Anagram	Easy	solution.py
243	Shortest Word Distance	Easy	solution.py
246	Strobogrammatic Number	Easy	solution.py
252	Meeting Rooms	Easy	solution.py
257	Binary Tree Paths	Easy	solution.py
258	Add Digits	Easy	solution.py
263	Ugly Number	Easy	solution.py
266	Palindrome Permutation	Easy	solution.py
268	Missing Number	Easy	solution.py
270	Closest Binary Search Tree Value	Easy	solution.py
278	First Bad Version	Easy	solution.py
283	Move Zeroes	Easy	solution.py
290	Word Pattern	Easy	solution.py
292	Nim Game	Easy	solution.py
293	Flip Game	Easy	solution.py
303	Range Sum Query - Immutable	Easy	solution.py
326	Power of Three	Easy	solution.py
338	Counting Bits	Easy	solution.py
342	Power of Four	Easy	solution.py
344	Reverse String	Easy	solution.py
345	Reverse Vowels of a String	Easy	solution.py
346	Moving Average from Data Stream	Easy	solution.py
349	Intersection of Two Arrays	Easy	solution.py
350	Intersection of Two Arrays II	Easy	solution.py
359	Logger Rate Limiter	Easy	solution.py
367	Valid Perfect Square	Easy	solution.py
374	Guess Number Higher or Lower	Easy	solution.py
383	Ransom Note	Easy	solution.py
387	First Unique Character in a String	Easy	solution.py
389	Find the Difference	Easy	solution.py
392	Is Subsequence	Easy	solution.py
401	Binary Watch	Easy	solution.py
404	Sum of Left Leaves	Easy	solution.py
405	Convert a Number to Hexadecimal	Easy	solution.py
408	Valid Word Abbreviation	Easy	solution.py
409	Longest Palindrome	Easy	solution.py
412	Fizz Buzz	Easy	solution.py
414	Third Maximum Number	Easy	solution.py
415	Add Strings	Easy	solution.py
422	Valid Word Square	Easy	solution.py
434	Number of Segments in a String	Easy	solution.py
441	Arranging Coins	Easy	solution.py
448	Find All Numbers Disappeared in an Array	Easy	solution.py
455	Assign Cookies	Easy	solution.py
459	Repeated Substring Pattern	Easy	solution.py
461	Hamming Distance	Easy	solution.py
463	Island Perimeter	Easy	solution.py
476	Number Complement	Easy	solution.py
482	License Key Formatting	Easy	solution.py
485	Max Consecutive Ones	Easy	solution.py
492	Construct the Rectangle	Easy	solution.py
495	Teemo Attacking	Easy	solution.py
496	Next Greater Element I	Easy	solution.py
500	Keyboard Row	Easy	solution.py
501	Find Mode in Binary Search Tree	Easy	solution.py
504	Base 7	Easy	solution.py
506	Relative Ranks	Easy	solution.py
507	Perfect Number	Easy	solution.py
509	Fibonacci Number	Easy	solution.py
520	Detect Capital	Easy	solution.py
521	Longest Uncommon Subsequence I	Easy	solution.py
530	Minimum Absolute Difference in BST	Easy	solution.py
541	Reverse String II	Easy	solution.py
543	Diameter of Binary Tree	Easy	solution.py
551	Student Attendance Record I	Easy	solution.py
557	Reverse Words in a String III	Easy	solution.py
559	Maximum Depth of N-ary Tree	Easy	solution.py
561	Array Partition	Easy	solution.py
563	Binary Tree Tilt	Easy	solution.py
566	Reshape the Matrix	Easy	solution.py
572	Subtree of Another Tree	Easy	solution.py
575	Distribute Candies	Easy	solution.py
589	N-ary Tree Preorder Traversal	Easy	solution.py
590	N-ary Tree Postorder Traversal	Easy	solution.py
594	Longest Harmonious Subsequence	Easy	solution.py
598	Range Addition II	Easy	solution.py
599	Minimum Index Sum of Two Lists	Easy	solution.py
604	Design Compressed String Iterator	Easy	solution.py
605	Can Place Flowers	Easy	solution.py
617	Merge Two Binary Trees	Easy	solution.py
628	Maximum Product of Three Numbers	Easy	solution.py
637	Average of Levels in Binary Tree	Easy	solution.py
643	Maximum Average Subarray I	Easy	solution.py
645	Set Mismatch	Easy	solution.py
653	Two Sum IV - Input is a BST	Easy	solution.py
657	Robot Return to Origin	Easy	solution.py
661	Image Smoother	Easy	solution.py
671	Second Minimum Node In a Binary Tree	Easy	solution.py
674	Longest Continuous Increasing Subsequence	Easy	solution.py
680	Valid Palindrome II	Easy	solution.py
682	Baseball Game	Easy	solution.py
693	Binary Number with Alternating Bits	Easy	solution.py
696	Count Binary Substrings	Easy	solution.py
697	Degree of an Array	Easy	solution.py
700	Search in a Binary Search Tree	Easy	solution.py
703	Kth Largest Element in a Stream	Easy	solution.py
704	Binary Search	Easy	solution.py
705	Design HashSet	Easy	solution.py
706	Design HashMap	Easy	solution.py
709	To Lower Case	Easy	solution.py
717	1-bit and 2-bit Characters	Easy	solution.py
724	Find Pivot Index	Easy	solution.py
728	Self Dividing Numbers	Easy	solution.py
733	Flood Fill	Easy	solution.py
734	Sentence Similarity	Easy	solution.py
744	Find Smallest Letter Greater Than Target	Easy	solution.py
746	Min Cost Climbing Stairs	Easy	solution.py
747	Largest Number At Least Twice of Others	Easy	solution.py
748	Shortest Completing Word	Easy	solution.py
760	Find Anagram Mappings	Easy	solution.py
762	Prime Number of Set Bits in Binary Representation	Easy	solution.py
766	Toeplitz Matrix	Easy	solution.py
771	Jewels and Stones	Easy	solution.py
783	Minimum Distance Between BST Nodes	Easy	solution.py
796	Rotate String	Easy	solution.py
800	Similar RGB Color	Easy	solution.py
804	Unique Morse Code Words	Easy	solution.py
806	Number of Lines To Write String	Easy	solution.py
812	Largest Triangle Area	Easy	solution.py
819	Most Common Word	Easy	solution.py
821	Shortest Distance to a Character	Easy	solution.py
824	Goat Latin	Easy	solution.py
830	Positions of Large Groups	Easy	solution.py
832	Flipping an Image	Easy	solution.py
836	Rectangle Overlap	Easy	solution.py
844	Backspace String Compare	Easy	solution.py
859	Buddy Strings	Easy	solution.py
860	Lemonade Change	Easy	solution.py
867	Transpose Matrix	Easy	solution.py
868	Binary Gap	Easy	solution.py
872	Leaf-Similar Trees	Easy	solution.py
876	Middle of the Linked List	Easy	solution.py
883	Projection Area of 3D Shapes	Easy	solution.py
884	Uncommon Words from Two Sentences	Easy	solution.py
888	Fair Candy Swap	Easy	solution.py
892	Surface Area of 3D Shapes	Easy	solution.py
896	Monotonic Array	Easy	solution.py
897	Increasing Order Search Tree	Easy	solution.py
905	Sort Array By Parity	Easy	solution.py
908	Smallest Range I	Easy	solution.py
914	X of a Kind in a Deck of Cards	Easy	solution.py
917	Reverse Only Letters	Easy	solution.py
922	Sort Array By Parity II	Easy	solution.py
925	Long Pressed Name	Easy	solution.py
929	Unique Email Addresses	Easy	solution.py
933	Number of Recent Calls	Easy	solution.py

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