📋 Easy Problems Checklist

Track progress on 343 LeetCode Easy problems

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Status ID Problem Name Code
✅ 1 Two Sum View Code
✅ 21 Merge Two Sorted Lists View Code
✅ 35 Search Insert Position View Code
✅ 58 Length of Last Word View Code
✅ 70 Climbing Stairs View Code
✅ 83 Remove Duplicates from Sorted List View Code
✅ 88 Merge Sorted Array View Code
✅ 100 Same Tree View Code
✅ 101 Symmetric Tree View Code
✅ 104 Maximum Depth of Binary Tree View Code
✅ 110 Balanced Binary Tree View Code
✅ 112 Path Sum View Code
⬜ 118 Pascal's Triangle
✅ 121 Best Time to Buy and Sell Stock View Code
✅ 125 Valid Palindrome View Code
✅ 136 Single Number View Code
✅ 141 Linked List Cycle View Code
✅ 160 Intersection of Two Linked Lists View Code
✅ 169 Majority Element View Code
✅ 171 Excel Sheet Column Number View Code
✅ 191 Number of 1 Bits View Code
✅ 202 Happy Number View Code
✅ 203 Remove Linked List Elements View Code
✅ 205 Isomorphic Strings View Code
✅ 206 Reverse Linked List View Code
✅ 217 Contains Duplicate View Code
✅ 219 Contains Duplicate II View Code
✅ 226 Invert Binary Tree View Code
✅ 231 Power of Two View Code
✅ 235 Lowest Common Ancestor of a BST View Code
✅ 237 Delete Node in a Linked List View Code
✅ 242 Valid Anagram View Code
⬜ 257 Binary Tree Paths
✅ 258 Add Digits View Code
✅ 268 Missing Number View Code
✅ 278 First Bad Version View Code
✅ 283 Move Zeroes View Code
⬜ 290 Word Pattern
✅ 292 Nim Game View Code
✅ 326 Power of Three View Code
✅ 342 Power of Four View Code
✅ 344 Reverse String View Code
✅ 345 Reverse Vowels of a String View Code
⬜ 349 Intersection of Two Arrays
⬜ 350 Intersection of Two Arrays II
✅ 367 Valid Perfect Square View Code
✅ 371 Sum of Two Integers View Code
✅ 374 Guess Number Higher or Lower View Code
✅ 383 Ransom Note View Code
✅ 387 First Unique Character in a String View Code
⬜ 389 Find the Difference
✅ 392 Is Subsequence View Code
✅ 404 Sum of Left Leaves View Code
⬜ 405 Convert a Number to Hexadecimal
⬜ 409 Longest Palindrome
✅ 412 Fizz Buzz View Code
⬜ 415 Add Strings
⬜ 434 Number of Segments in a String
✅ 441 Arranging Coins View Code
✅ 448 Find All Numbers Disappeared in an Array View Code
⬜ 461 Hamming Distance
⬜ 463 Island Perimeter
✅ 485 Max Consecutive Ones View Code
⬜ 492 Construct the Rectangle
⬜ 496 Next Greater Element I
⬜ 500 Keyboard Row
✅ 509 Fibonacci Number View Code
⬜ 520 Detect Capital
⬜ 541 Reverse String II
✅ 543 Diameter of Binary Tree View Code
⬜ 551 Student Attendance Record I
✅ 557 Reverse Words in a String III View Code
⬜ 561 Array Partition
⬜ 566 Reshape the Matrix
⬜ 572 Subtree of Another Tree
⬜ 575 Distribute Candies
⬜ 589 N-ary Tree Preorder Traversal
⬜ 605 Can Place Flowers
⬜ 617 Merge Two Binary Trees
✅ 637 Average of Levels in Binary Tree View Code
✅ 645 Set Mismatch View Code
✅ 657 Robot Return to Origin View Code
⬜ 682 Baseball Game
⬜ 693 Binary Number with Alternating Bits
⬜ 700 Search in a Binary Search Tree
✅ 704 Binary Search View Code
⬜ 709 To Lower Case
⬜ 728 Self Dividing Numbers
⬜ 771 Jewels and Stones
⬜ 796 Rotate String
⬜ 804 Unique Morse Code Words
⬜ 867 Transpose Matrix
✅ 908 Smallest Range I View Code
✅ 1108 Defanging an IP Address View Code
⬜ 1221 Split a String in Balanced Strings
⬜ 1281 Subtract the Product and Sum of Digits of an Integer
⬜ 1323 Maximum 69 Number
✅ 1342 Number of Steps to Reduce a Number to Zero View Code
⬜ 1431 Kids With the Greatest Number of Candies
⬜ 1464 Maximum Product of Two Elements in an Array
✅ 1470 Shuffle the Array View Code
⬜ 1480 Running Sum of 1d Array
⬜ 1486 XOR Operation in an Array
⬜ 1512 Number of Good Pairs
⬜ 1518 Water Bottles
✅ 1528 Shuffle String View Code
⬜ 1544 Make The String Great
⬜ 1550 Three Consecutive Odds
⬜ 1556 Thousand Separator
⬜ 1572 Matrix Diagonal Sum
⬜ 1614 Maximum Nesting Depth of the Parentheses
⬜ 1619 Mean of Array After Removing Some Elements
⬜ 1636 Sort Array by Increasing Frequency
⬜ 1637 Widest Vertical Area Between Two Points Containing No Points
⬜ 1662 Check If Two String Arrays are Equivalent
⬜ 1672 Richest Customer Wealth
⬜ 1678 Goal Parser Interpretation
⬜ 1684 Count the Number of Consistent Strings
⬜ 1688 Count of Matches in Tournament
⬜ 1704 Determine if String Halves Are Alike
⬜ 1716 Calculate Money in Leetcode Bank
⬜ 1720 Decode XORed Array
⬜ 1725 Number of Rectangles That Can Form The Largest Square
⬜ 1732 Find the Highest Altitude
⬜ 1748 Sum of Unique Elements
⬜ 1752 Check if Array Is Sorted and Rotated
⬜ 1768 Merge Strings Alternately
⬜ 1773 Count Items Matching a Rule
⬜ 1790 Check if One String Swap Can Make Strings Equal
✅ 1791 Find Center of Star Graph View Code
⬜ 1796 Second Largest Digit in a String
⬜ 1800 Maximum Ascending Subarray Sum
⬜ 1805 Number of Different Integers in a String
⬜ 1812 Determine Color of a Chessboard Square
⬜ 1816 Truncate Sentence
⬜ 1822 Sign of the Product of an Array
⬜ 1827 Minimum Operations to Make the Array Increasing
⬜ 1832 Check if the Sentence Is Pangram
⬜ 1837 Sum of Digits in Base K
⬜ 1844 Replace All Digits with Characters
⬜ 1848 Minimum Distance to the Target Element
⬜ 1854 Maximum Population Year
⬜ 1859 Sorting the Sentence
⬜ 1863 Sum of All Subset XOR Totals
⬜ 1869 Longer Contiguous Segments of Ones than Zeros
⬜ 1876 Substrings of Size Three with Distinct Characters
⬜ 1880 Check if Word Equals Summation of Two Words
⬜ 1886 Determine Whether Matrix Can Be Obtained By Rotation
⬜ 1893 Check if All the Integers in a Range Are Covered
⬜ 1897 Redistribute Characters to Make All Strings Equal
⬜ 1903 Largest Odd Number in String
⬜ 1909 Remove One Element to Make the Array Strictly Increasing
⬜ 1913 Maximum Product Difference Between Two Pairs
⬜ 1920 Build Array from Permutation
⬜ 1925 Count Square Sum Triples
✅ 1929 Concatenation of Array View Code
⬜ 1941 Check if All Characters Have Equal Number of Occurrences
⬜ 1945 Sum of Digits of String After Convert
⬜ 1952 Three Divisors
⬜ 1957 Delete Characters to Make Fancy String
⬜ 1961 Check if String Is a Prefix of Array
⬜ 1974 Minimum Time to Type Word Using Special Typewriter
⬜ 1979 Find Greatest Common Divisor of Array
⬜ 1984 Minimum Difference Between Highest and Lowest of K Scores
⬜ 1991 Find the Middle Index in Array
⬜ 1995 Count Special Quadruplets
⬜ 2000 Reverse Prefix of Word
⬜ 2006 Count Number of Pairs With Absolute Difference K
⬜ 2011 Final Value of Variable After Performing Operations
⬜ 2022 Convert 1D Array Into 2D Array
⬜ 2027 Minimum Moves to Convert String
⬜ 2032 Two Out of Three
⬜ 2037 Minimum Number of Moves to Seat Everyone
⬜ 2042 Check if Numbers Are Ascending in a Sentence
⬜ 2053 Kth Distinct String in an Array
⬜ 2057 Smallest Index With Equal Value
⬜ 2062 Count Vowel Substrings of a String
⬜ 2068 Check Whether Two Strings are Almost Equivalent
⬜ 2073 Time Needed to Buy Tickets
⬜ 2078 Two Furthest Houses With Different Colors
⬜ 2085 Count Common Words With One Occurrence
⬜ 2089 Find Target Indices After Sorting Array
⬜ 2094 Finding 3-Digit Even Numbers
✅ 2099 Find Subsequence of Length K With the Largest Sum View Code
⬜ 2103 Rings and Rods
⬜ 2108 First Palindrome in an Array
⬜ 2114 Maximum Number of Words Found in Sentences
⬜ 2119 A Number After a Double Reversal
⬜ 2124 Check if All A's Appears Before All B's
⬜ 2129 Capitalize the Title
⬜ 2133 Check if Every Row and Column Contains All Numbers
⬜ 2148 Count Elements With Strictly Smaller and Greater Elements
⬜ 2154 Keep Multiplying Found Values by Two
⬜ 2160 Minimum Sum of Four Digit Number
⬜ 2164 Sort Even and Odd Indices Independently
⬜ 2169 Count Operations to Obtain Zero
⬜ 2176 Count Equal and Divisible Pairs in an Array
⬜ 2180 Count Integers With Even Digit Sum
⬜ 2185 Counting Words With a Given Prefix
⬜ 2190 Most Frequent Number Following Key In an Array
⬜ 2194 Cells in a Range on an Excel Sheet
⬜ 2200 Find All K-Distant Indices in an Array
⬜ 2206 Divide Array Into Equal Pairs
⬜ 2210 Count Hills and Valleys in an Array
⬜ 2215 Find the Difference of Two Arrays
⬜ 2220 Minimum Bit Flips to Convert Number
⬜ 2231 Largest Number After Digit Swaps by Parity
⬜ 2235 Add Two Integers
⬜ 2236 Root Equals Sum of Children
⬜ 2239 Find Closest Number to Zero
⬜ 2243 Calculate Digit Sum of a String
⬜ 2248 Intersection of Multiple Arrays
⬜ 2255 Count Prefixes of a Given String
⬜ 2259 Remove Digit From Number to Maximize Result
⬜ 2264 Largest 3-Same-Digit Number in String
⬜ 2269 Find the K-Beauty of a Number
⬜ 2278 Percentage of Letter in String
⬜ 2283 Check if Number Has Equal Digit Count and Digit Value
⬜ 2293 Min Max Game
⬜ 2299 Strong Password Checker II
⬜ 2303 Calculate Amount Paid in Taxes
⬜ 2309 Greatest English Letter in Upper and Lower Case
⬜ 2315 Count Asterisks
⬜ 2319 Check if Matrix Is X-Matrix
⬜ 2325 Decode the Message
⬜ 2331 Evaluate Boolean Binary Tree
⬜ 2335 Minimum Amount of Time to Fill Cups
⬜ 2341 Maximum Number of Pairs in Array
⬜ 2347 Best Poker Hand
⬜ 2351 First Letter to Appear Twice
⬜ 2357 Make Array Zero by Subtracting Equal Amounts
⬜ 2363 Merge Similar Items
⬜ 2367 Number of Arithmetic Triplets
⬜ 2373 Largest Local Values in a Matrix
⬜ 2383 Minimum Hours of Training to Win a Competition
⬜ 2389 Longest Subsequence With Limited Sum
⬜ 2395 Find Subarrays With Equal Sum
⬜ 2399 Check Distances Between Same Letters
⬜ 2404 Most Frequent Even Element
⬜ 2413 Smallest Even Multiple
⬜ 2418 Sort the People
⬜ 2427 Number of Common Factors
⬜ 2441 Largest Positive Integer That Exists With Its Negative
⬜ 2446 Determine if Two Events Have Conflict
⬜ 2460 Apply Operations to an Array
⬜ 2469 Convert the Temperature
⬜ 2475 Number of Unequal Triplets in Array
⬜ 2481 Minimum Cuts to Divide a Circle
✅ 2485 Find the Pivot Integer View Code
⬜ 2496 Maximum Value of a String in an Array
⬜ 2500 Delete Greatest Value in Each Row
⬜ 2515 Shortest Distance to Target String in a Circular Array
⬜ 2520 Count the Digits That Divide a Number
⬜ 2525 Categorize Box According to Criteria
⬜ 2529 Maximum Count of Positive Integer and Negative Integer
⬜ 2535 Difference Between Element Sum and Digit Sum
⬜ 2540 Minimum Common Value
⬜ 2544 Alternating Digit Sum
⬜ 2549 Count Distinct Numbers on Board
⬜ 2553 Separate the Digits in an Array
⬜ 2562 Find the Array Concatenation Value
⬜ 2566 Maximum Difference by Remapping a Digit
⬜ 2574 Left and Right Sum Differences
⬜ 2582 Pass the Pillow
⬜ 2600 K Items With the Maximum Sum
⬜ 2605 Form Smallest Number From Two Digit Arrays
⬜ 2614 Prime In Diagonal
⬜ 2639 Find the Width of Columns of a Grid
⬜ 2643 Row With Maximum Ones
⬜ 2651 Calculate Delayed Arrival Time
⬜ 2652 Sum Multiples
⬜ 2656 Maximum Sum With Exactly K Elements
⬜ 2660 Determine the Winner of a Bowling Game
⬜ 2670 Find the Distinct Difference Array
⬜ 2678 Number of Senior Citizens
⬜ 2682 Find the Losers of the Circular Game
⬜ 2696 Minimum String Length After Removing Substrings
⬜ 2697 Lexicographically Smallest Palindrome
⬜ 2706 Buy Two Chocolates
⬜ 2710 Remove Trailing Zeros From a String
⬜ 2716 Minimize String Length
⬜ 2729 Check if Number is Fascinating
⬜ 2733 Neither Minimum nor Maximum
⬜ 2739 Total Distance Traveled
⬜ 2748 Number of Beautiful Pairs
⬜ 2765 Longest Alternating Subarray
⬜ 2769 Find the Maximum Achievable Number
⬜ 2778 Sum of Squares of Special Elements
✅ 2784 Check if Array is Good View Code
⬜ 2788 Split Strings by Separator
⬜ 2798 Number of Employees Who Met the Target
⬜ 2806 Account Balance After Rounded Purchase
⬜ 2810 Faulty Keyboard
⬜ 2824 Count Pairs Whose Sum is Less than Target
⬜ 2828 Check if a String Is an Acronym of Words
⬜ 2839 Check if Strings Can be Made Equal With Operations I
⬜ 2848 Points That Intersect With Cars
⬜ 2859 Sum of Values at Indices With K Set Bits
⬜ 2864 Maximum Odd Binary Number
⬜ 2894 Divisible and Non-divisible Sums Difference
⬜ 2903 Find Indices With Index and Value Difference I
⬜ 2908 Minimum Sum of Mountain Triplets I
⬜ 2923 Find Champion I
⬜ 2928 Distribute Candies Among Children I
⬜ 2942 Find Words Containing Character
✅ 2951 Find the Peaks View Code
⬜ 2956 Find Common Elements Between Two Arrays
⬜ 2960 Count Tested Devices After Test Operations
⬜ 2965 Missing and Repeated Values
⬜ 2970 Count the Number of Incremovable Subarrays I
✅ 2974 Minimum Number Game View Code
✅ 2980 Check if Bitwise OR Has Trailing Zeros View Code
⬜ 2996 Smallest Missing Integer Greater Than Sequential Prefix Sum
⬜ 3000 Maximum Area of Longest Diagonal Rectangle
⬜ 3005 Maximum Frequency Elements
⬜ 3010 Divide an Array Into Subarrays With Minimum Cost I
⬜ 3014 Minimum Number of Pushes to Type Word I
⬜ 3019 Number of Changing Keys
⬜ 3024 Type of Triangle
✅ 3028 Ant on the Boundary View Code
✅ 3033 Modify the Matrix View Code
✅ 3038 Maximum Number of Operations With the Same Score I View Code
✅ 3042 Count Prefix and Suffix Pairs I View Code
⬜ 3046 Split the Array
⬜ 3065 Minimum Operations to Exceed Threshold Value I
⬜ 3069 Distribute Elements Into Two Arrays I
⬜ 3079 Find the Sum of Encrypted Integers
✅ 3099 Harshad Number View Code
✅ 3110 Score of a String View Code
⬜ 3127 Make a Square with the Same Color
⬜ 3131 Find the Integer Added to Array I
⬜ 3146 Permutation Difference between Two Strings
✅ 3151 Special Array I View Code
⬜ 3158 Find the XOR of Numbers Which Appear Twice
⬜ 3162 Find the Number of Good Pairs I
⬜ 3168 Minimum Number of Chairs in a Waiting Room
⬜ 3184 Count Pairs That Form a Complete Day I
⬜ 3190 Find Minimum Operations to Make All Elements Divisible by Three
⬜ 3222 Find the Winning Player in Coin Game
⬜ 3270 Find the Key of the Numbers
✅ 3280 Convert Date to Binary View Code
✅ 3285 Find Indices of Stable Mountains View Code
✅ 3289 The Two Sneaky Numbers of Digitville View Code