Easy LeetCode Problems: Page 2 of 4

Problems 201 to 400 of the 760 Easy-rated problems in this library, continuing the list on the Easy hub.

Page 2 of 4

Easy problems, page 2
No.	Problem	Topics
0925	Long Pressed Name	Two Pointers, String
0929	Unique Email Addresses	Array, Hash Table, String
0933	Number of Recent Calls	Design, Queue, Data Stream
0938	Range Sum of BST	Tree, Depth-First Search, Binary Search Tree +1
0941	Valid Mountain Array	Array
0942	DI String Match	Greedy, Array, Two Pointers +1
0944	Delete Columns to Make Sorted	Array, String
0953	Verifying an Alien Dictionary	Array, Hash Table, String
0961	N-Repeated Element in Size 2N Array	Array, Hash Table
0965	Univalued Binary Tree	Tree, Depth-First Search, Breadth-First Search +1
0976	Largest Perimeter Triangle	Greedy, Array, Math +1
0977	Squares of a Sorted Array	Array, Two Pointers, Sorting
0989	Add to Array-Form of Integer	Array, Math
0993	Cousins in Binary Tree	Tree, Depth-First Search, Breadth-First Search +1
0997	Find the Town Judge	Graph, Array, Hash Table
0999	Available Captures for Rook	Array, Matrix, Simulation
1002	Find Common Characters	Array, Hash Table, String
1005	Maximize Sum Of Array After K Negations	Greedy, Array, Sorting
1009	Complement of Base 10 Integer	Bit Manipulation
1013	Partition Array Into Three Parts With Equal Sum	Greedy, Array
1018	Binary Prefix Divisible By 5	Bit Manipulation, Array
1021	Remove Outermost Parentheses	Stack, String
1022	Sum of Root To Leaf Binary Numbers	Tree, Depth-First Search, Binary Tree
1025	Divisor Game	Brainteaser, Math, Dynamic Programming +1
1030	Matrix Cells in Distance Order	Geometry, Array, Math +2
1037	Valid Boomerang	Geometry, Array, Math
1046	Last Stone Weight	Array, Heap (Priority Queue)
1047	Remove All Adjacent Duplicates In String	Stack, String
1050	Actors and Directors Who Cooperated At Least Three Times	Database
1051	Height Checker	Array, Counting Sort, Sorting
1068	Product Sales Analysis I	Database
1071	Greatest Common Divisor of Strings	Math, String
1078	Occurrences After Bigram	String
1089	Duplicate Zeros	Array, Two Pointers
1103	Distribute Candies to People	Math, Simulation
1108	Defanging an IP Address	String
1114	Print in Order	Concurrency
1122	Relative Sort Array	Array, Hash Table, Counting Sort +1
1128	Number of Equivalent Domino Pairs	Array, Hash Table, Counting
1137	N-th Tribonacci Number	Memoization, Math, Dynamic Programming
1154	Day of the Year	Math, String
1160	Find Words That Can Be Formed by Characters	Array, Hash Table, String +1
1175	Prime Arrangements	Math
1184	Distance Between Bus Stops	Array
1185	Day of the Week	Math
1189	Maximum Number of Balloons	Hash Table, String, Counting
1200	Minimum Absolute Difference	Array, Sorting
1207	Unique Number of Occurrences	Array, Hash Table
1217	Minimum Cost to Move Chips to The Same Position	Greedy, Array, Math
1221	Split a String in Balanced Strings	Greedy, String, Counting
1232	Check If It Is a Straight Line	Geometry, Array, Math
1252	Cells with Odd Values in a Matrix	Array, Math, Simulation
1260	Shift 2D Grid	Array, Matrix, Simulation
1266	Minimum Time Visiting All Points	Geometry, Array, Math
1275	Find Winner on a Tic Tac Toe Game	Array, Hash Table, Matrix +1
1281	Subtract the Product and Sum of Digits of an Integer	Math
1287	Element Appearing More Than 25% In Sorted Array	Array
1290	Convert Binary Number in a Linked List to Integer	Linked List, Math
1295	Find Numbers with Even Number of Digits	Array, Math
1299	Replace Elements with Greatest Element on Right Side	Array
1304	Find N Unique Integers Sum up to Zero	Array, Math
1309	Decrypt String from Alphabet to Integer Mapping	String
1313	Decompress Run-Length Encoded List	Array
1317	Convert Integer to the Sum of Two No-Zero Integers	Math
1323	Maximum 69 Number	Greedy, Math
1331	Rank Transform of an Array	Array, Hash Table, Sorting
1332	Remove Palindromic Subsequences	Two Pointers, String
1337	The K Weakest Rows in a Matrix	Array, Binary Search, Matrix +2
1342	Number of Steps to Reduce a Number to Zero	Bit Manipulation, Math
1346	Check If N and Its Double Exist	Array, Hash Table, Two Pointers +2
1351	Count Negative Numbers in a Sorted Matrix	Array, Binary Search, Matrix
1356	Sort Integers by The Number of 1 Bits	Bit Manipulation, Array, Counting +1
1360	Number of Days Between Two Dates	Math, String
1365	How Many Numbers Are Smaller Than the Current Number	Array, Hash Table, Counting Sort +1
1370	Increasing Decreasing String	Hash Table, String, Counting
1374	Generate a String With Characters That Have Odd Counts	String
1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Tree, Depth-First Search, Breadth-First Search +1
1380	Lucky Numbers in a Matrix	Array, Matrix
1385	Find the Distance Value Between Two Arrays	Array, Two Pointers, Binary Search +1
1389	Create Target Array in the Given Order	Array, Simulation
1394	Find Lucky Integer in an Array	Array, Hash Table, Counting
1399	Count Largest Group	Hash Table, Math
1403	Minimum Subsequence in Non-Increasing Order	Greedy, Array, Sorting
1408	String Matching in an Array	Array, String, String Matching
1413	Minimum Value to Get Positive Step by Step Sum	Array, Prefix Sum
1417	Reformat The String	String
1422	Maximum Score After Splitting a String	String, Prefix Sum
1431	Kids With the Greatest Number of Candies	Array
1436	Destination City	Array, Hash Table, String
1437	Check If All 1's Are at Least Length K Places Away	Array
1446	Consecutive Characters	String
1450	Number of Students Doing Homework at a Given Time	Array
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Two Pointers, String, String Matching
1460	Make Two Arrays Equal by Reversing Subarrays	Array, Hash Table, Sorting
1464	Maximum Product of Two Elements in an Array	Array, Sorting, Heap (Priority Queue)
1470	Shuffle the Array	Array
1475	Final Prices With a Special Discount in a Shop	Stack, Array, Monotonic Stack
1480	Running Sum of 1d Array	Array, Prefix Sum
1486	XOR Operation in an Array	Bit Manipulation, Math
1491	Average Salary Excluding the Minimum and Maximum Salary	Array, Sorting
1496	Path Crossing	Hash Table, String
1502	Can Make Arithmetic Progression From Sequence	Array, Sorting
1507	Reformat Date	String
1512	Number of Good Pairs	Array, Hash Table, Math +1
1518	Water Bottles	Math, Simulation
1523	Count Odd Numbers in an Interval Range	Math
1528	Shuffle String	Array, String
1534	Count Good Triplets	Array, Enumeration
1539	Kth Missing Positive Number	Array, Binary Search
1544	Make The String Great	Stack, String
1550	Three Consecutive Odds	Array
1556	Thousand Separator	String
1560	Most Visited Sector in a Circular Track	Array, Simulation
1566	Detect Pattern of Length M Repeated K or More Times	Array, Enumeration
1572	Matrix Diagonal Sum	Array, Matrix
1576	Replace All ?'s to Avoid Consecutive Repeating Characters	String
1582	Special Positions in a Binary Matrix	Array, Matrix
1588	Sum of All Odd Length Subarrays	Array, Math, Prefix Sum
1592	Rearrange Spaces Between Words	String
1598	Crawler Log Folder	Stack, Array, String
1603	Design Parking System	Design, Counting, Simulation
1608	Special Array With X Elements Greater Than or Equal X	Array, Binary Search, Sorting
1614	Maximum Nesting Depth of the Parentheses	Stack, String
1619	Mean of Array After Removing Some Elements	Array, Sorting
1624	Largest Substring Between Two Equal Characters	Hash Table, String
1629	Slowest Key	Array, String
1636	Sort Array by Increasing Frequency	Array, Hash Table, Sorting
1637	Widest Vertical Area Between Two Points Containing No Points	Array, Sorting
1640	Check Array Formation Through Concatenation	Array, Hash Table
1646	Get Maximum in Generated Array	Array, Simulation
1652	Defuse the Bomb	Array, Sliding Window
1656	Design an Ordered Stream	Design, Array, Hash Table +1
1662	Check If Two String Arrays are Equivalent	Array, String
1668	Maximum Repeating Substring	String, Dynamic Programming, String Matching
1672	Richest Customer Wealth	Array, Matrix
1678	Goal Parser Interpretation	String
1684	Count the Number of Consistent Strings	Bit Manipulation, Array, Hash Table +2
1688	Count of Matches in Tournament	Math, Simulation
1694	Reformat Phone Number	String
1700	Number of Students Unable to Eat Lunch	Stack, Queue, Array +1
1704	Determine if String Halves Are Alike	String, Counting
1710	Maximum Units on a Truck	Greedy, Array, Sorting
1716	Calculate Money in Leetcode Bank	Math
1720	Decode XORed Array	Bit Manipulation, Array
1725	Number Of Rectangles That Can Form The Largest Square	Array
1732	Find the Highest Altitude	Array, Prefix Sum
1736	Latest Time by Replacing Hidden Digits	Greedy, String
1742	Maximum Number of Balls in a Box	Hash Table, Math, Counting
1748	Sum of Unique Elements	Array, Hash Table, Counting
1752	Check if Array Is Sorted and Rotated	Array
1758	Minimum Changes To Make Alternating Binary String	String
1763	Longest Nice Substring	Bit Manipulation, Hash Table, String +2
1768	Merge Strings Alternately	Two Pointers, String
1773	Count Items Matching a Rule	Array, String
1779	Find Nearest Point That Has the Same X or Y Coordinate	Array
1784	Check if Binary String Has at Most One Segment of Ones	String
1790	Check if One String Swap Can Make Strings Equal	Hash Table, String, Counting
1791	Find Center of Star Graph	Graph
1796	Second Largest Digit in a String	Hash Table, String
1800	Maximum Ascending Subarray Sum	Array
1805	Number of Different Integers in a String	Hash Table, String
1812	Determine Color of a Chessboard Square	Math, String
1816	Truncate Sentence	Array, String
1822	Sign of the Product of an Array	Array, Math
1827	Minimum Operations to Make the Array Increasing	Greedy, Array
1832	Check if the Sentence Is Pangram	Hash Table, String
1837	Sum of Digits in Base K	Math
1844	Replace All Digits with Characters	String
1848	Minimum Distance to the Target Element	Array
1854	Maximum Population Year	Array, Counting, Prefix Sum
1859	Sorting the Sentence	String, Sorting
1863	Sum of All Subset XOR Totals	Bit Manipulation, Array, Math +3
1869	Longer Contiguous Segments of Ones than Zeros	String
1876	Substrings of Size Three with Distinct Characters	Hash Table, String, Counting +1
1880	Check if Word Equals Summation of Two Words	String
1886	Determine Whether Matrix Can Be Obtained By Rotation	Array, Matrix
1893	Check if All the Integers in a Range Are Covered	Array, Hash Table, Prefix Sum
1897	Redistribute Characters to Make All Strings Equal	Hash Table, String, Counting
1903	Largest Odd Number in String	Greedy, Math, String
1909	Remove One Element to Make the Array Strictly Increasing	Array
1913	Maximum Product Difference Between Two Pairs	Array, Sorting
1920	Build Array from Permutation	Array, Simulation
1925	Count Square Sum Triples	Math, Enumeration
1929	Concatenation of Array	Array, Simulation
1935	Maximum Number of Words You Can Type	Hash Table, String
1941	Check if All Characters Have Equal Number of Occurrences	Hash Table, String, Counting
1945	Sum of Digits of String After Convert	String, Simulation
1952	Three Divisors	Math, Enumeration, Number Theory
1957	Delete Characters to Make Fancy String	String
1961	Check If String Is a Prefix of Array	Array, Two Pointers, String
1967	Number of Strings That Appear as Substrings in Word	Array, String
1971	Find if Path Exists in Graph	Depth-First Search, Breadth-First Search, Union Find +1
1974	Minimum Time to Type Word Using Special Typewriter	Greedy, String
1979	Find Greatest Common Divisor of Array	Array, Math, Number Theory
1984	Minimum Difference Between Highest and Lowest of K Scores	Array, Sorting, Sliding Window
1991	Find the Middle Index in Array	Array, Prefix Sum
1995	Count Special Quadruplets	Array, Hash Table, Enumeration
2000	Reverse Prefix of Word	Stack, Two Pointers, String
2006	Count Number of Pairs With Absolute Difference K	Array, Hash Table, Counting
2011	Final Value of Variable After Performing Operations	Array, String, Simulation

Problems with a complete Python solution are listed first, then by ascending problem number. Or go by technique instead: all LeetCode patterns.