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Counting

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All Counting problems

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⊣ 169 Majority Element
⊣ 229 Majority Element II
⊣ 299 Bulls and Cows
⊣ 347 Top K Frequent Elements
⊣ 383 Ransom Note
⊣ 387 First Unique Character in a String
⊣ 451 Sort Characters By Frequency
⊣ 594 Longest Harmonious Subsequence
⊣ 621 Task Scheduler
⊣ 692 Top K Frequent Words
⊣ 767 Reorganize String
⊣ 811 Subdomain Visit Count
⊣ 819 Most Common Word
⊣ 869 Reordered Power of 2
⊣ 884 Uncommon Words from Two Sentences
⊣ 900 RLE Iterator
⊣ 914 X of a Kind in a Deck of Cards
⊣ 923 3Sum With Multiplicity
⊣ 945 Minimum Increment to Make Array Unique
⊣ 992 Subarrays with K Different Integers
⊣ 1010 Pairs of Songs With Total Durations Divisible by 60
⊣ 1054 Distant Barcodes
⊣ 1079 Letter Tile Possibilities
⊣ 1090 Largest Values From Labels
⊣ 1128 Number of Equivalent Domino Pairs
⊣ 1160 Find Words That Can Be Formed by Characters
⊣ 1189 Maximum Number of Balloons
⊣ 1221 Split a String in Balanced Strings
⊣ 1255 Maximum Score Words Formed by Letters
⊣ 1267 Count Servers that Communicate
⊣ 1347 Minimum Number of Steps to Make Two Strings Anagram
⊣ 1356 Sort Integers by The Number of 1 Bits
⊣ 1366 Rank Teams by Votes
⊣ 1370 Increasing Decreasing String
⊣ 1394 Find Lucky Integer in an Array
⊣ 1399 Count Largest Group
⊣ 1400 Construct K Palindrome Strings
⊣ 1419 Minimum Number of Frogs Croaking
⊣ 1481 Least Number of Unique Integers after K Removals
⊣ 1497 Check If Array Pairs Are Divisible by k
⊣ 1512 Number of Good Pairs
⊣ 1519 Number of Nodes in the Sub-Tree With the Same Label (PRO)
⊣ 1603 Design Parking System
⊣ 1655 Distribute Repeating Integers
⊣ 1657 Determine if Two Strings Are Close
⊣ 1684 Count the Number of Consistent Strings (PRO)
⊣ 1704 Determine if String Halves Are Alike
⊣ 1726 Tuple with Same Product
⊣ 1737 Change Minimum Characters to Satisfy One of Three Conditions
⊣ 1742 Maximum Number of Balls in a Box
⊣ 1748 Sum of Unique Elements (PRO)
⊣ 1775 Equal Sum Arrays With Minimum Number of Operations
⊣ 1781 Sum of Beauty of All Substrings (PRO)
⊣ 1782 Count Pairs Of Nodes
⊣ 1787 Make the XOR of All Segments Equal to Zero
⊣ 1790 Check if One String Swap Can Make Strings Equal
⊣ 1814 Count Nice Pairs in an Array (PRO)
⊣ 1819 Number of Different Subsequences GCDs
⊣ 1830 Minimum Number of Operations to Make String Sorted
⊣ 1854 Maximum Population Year (PRO)
⊣ 1857 Largest Color Value in a Directed Graph
⊣ 1862 Sum of Floored Pairs
⊣ 1876 Substrings of Size Three with Distinct Characters (PRO)
⊣ 1897 Redistribute Characters to Make All Strings Equal
⊣ 1941 Check if All Characters Have Equal Number of Occurrences (PRO)
⊣ 1994 The Number of Good Subsets
⊣ 2001 Number of Pairs of Interchangeable Rectangles
⊣ 2006 Count Number of Pairs With Absolute Difference K
⊣ 2013 Detect Squares
⊣ 2014 Longest Subsequence Repeated k Times
⊣ 2023 Number of Pairs of Strings With Concatenation Equal to Target
⊣ 2025 Maximum Number of Ways to Partition an Array
⊣ 2029 Stone Game IX
⊣ 2048 Next Greater Numerically Balanced Number
⊣ 2053 Kth Distinct String in an Array
⊣ 2068 Check Whether Two Strings are Almost Equivalent
⊣ 2085 Count Common Words With One Occurrence
⊣ 2131 Longest Palindrome by Concatenating Two Letter Words
⊣ 2148 Count Elements With Strictly Smaller and Greater Elements
⊣ 2150 Find All Lonely Numbers in the Array
⊣ 2170 Minimum Operations to Make the Array Alternating
⊣ 2182 Construct String With Repeat Limit
⊣ 2183 Count Array Pairs Divisible by K
⊣ 2186 Minimum Number of Steps to Make Two Strings Anagram II
⊣ 2190 Most Frequent Number Following Key In an Array
⊣ 2206 Divide Array Into Equal Pairs
⊣ 2225 Find Players With Zero or One Losses
⊣ 2244 Minimum Rounds to Complete All Tasks
⊣ 2248 Intersection of Multiple Arrays
⊣ 2275 Largest Combination With Bitwise AND Greater Than Zero
⊣ 2283 Check if Number Has Equal Digit Count and Digit Value
⊣ 2284 Sender With Largest Word Count
⊣ 2287 Rearrange Characters to Make Target String
⊣ 2341 Maximum Number of Pairs in Array
⊣ 2347 Best Poker Hand
⊣ 2351 First Letter to Appear Twice
⊣ 2364 Count Number of Bad Pairs
⊣ 2384 Largest Palindromic Number
⊣ 2404 Most Frequent Even Element
⊣ 2416 Sum of Prefix Scores of Strings
⊣ 2423 Remove Letter To Equalize Frequency
⊣ 2442 Count Number of Distinct Integers After Reverse Operations
⊣ 2453 Destroy Sequential Targets
⊣ 2499 Minimum Total Cost to Make Arrays Unequal
⊣ 2506 Count Pairs Of Similar Strings
⊣ 2514 Count Anagrams
⊣ 2526 Find Consecutive Integers from a Data Stream
⊣ 2529 Maximum Count of Positive Integer and Negative Integer
⊣ 2531 Make Number of Distinct Characters Equal (PRO)
⊣ 2547 Minimum Cost to Split an Array
⊣ 2586 Count the Number of Vowel Strings in Range
⊣ 2748 Number of Beautiful Pairs
⊣ 2833 Furthest Point From Origin
⊣ 2856 Minimum Array Length After Pair Removals
⊣ 2870 Minimum Number of Operations to Make Array Empty
⊣ 2960 Count Tested Devices After Test Operations
⊣ 2981 Find Longest Special Substring That Occurs Thrice I
⊣ 2982 Find Longest Special Substring That Occurs Thrice II
⊣ 3005 Count Elements With Maximum Frequency
⊣ 3016 Minimum Number of Pushes to Type Word II
⊣ 3035 Maximum Palindromes After Operations
⊣ 3039 Apply Operations to Make String Empty
⊣ 3044 Most Frequent Prime
⊣ 3046 Split the Array
⊣ 3071 Minimum Operations to Write the Letter Y on a Grid
⊣ 3081 Replace Question Marks in String to Minimize Its Value
⊣ 3084 Count Substrings Starting and Ending with Given Character
⊣ 3085 Minimum Deletions to Make String K-Special
⊣ 3128 Right Triangles
⊣ 3137 Minimum Number of Operations to Make Word K-Periodic
⊣ 3138 Minimum Length of Anagram Concatenation
⊣ 3144 Minimum Substring Partition of Equal Character Frequency
⊣ 3153 Sum of Digit Differences of All Pairs
⊣ 3184 Count Pairs That Form a Complete Day I
⊣ 3185 Count Pairs That Form a Complete Day II
⊣ 3186 Maximum Total Damage With Spell Casting
⊣ 3223 Minimum Length of String After Operations
⊣ 3228 Maximum Number of Operations to Move Ones to the End (PRO)
⊣ 3238 Find the Number of Winning Players
⊣ 3265 Count Almost Equal Pairs I
⊣ 3267 Count Almost Equal Pairs II
⊣ 3312 Sorted GCD Pair Queries (PRO)
⊣ 3335 Total Characters in String After Transformations I
⊣ 3337 Total Characters in String After Transformations II
⊣ 3371 Identify the Largest Outlier in an Array
⊣ 3389 Minimum Operations to Make Character Frequencies Equal
⊣ 3438 Find Valid Pair of Adjacent Digits in String
⊣ 3442 Maximum Difference Between Even and Odd Frequency I (PRO)
⊣ 3443 Maximum Manhattan Distance After K Changes (PRO)
⊣ 3467 Transform Array by Parity
⊣ 3518 Smallest Palindromic Rearrangement II
⊣ 3527 Find the Most Common Response
⊣ 3541 Find Most Frequent Vowel and Consonant
⊣ 3545 Minimum Deletions for At Most K Distinct Characters
⊣ 3583 Count Special Triplets
⊣ 3591 Check if Any Element Has Prime Frequency
⊣ 3636 Threshold Majority Queries
⊣ 3659 Partition Array Into K-Distinct Groups
⊣ 3663 Find The Least Frequent Digit
⊣ 3664 Two-Letter Card Game
⊣ 3679 Minimum Discards to Balance Inventory
⊣ 3692 Majority Frequency Characters
⊣ 3712 Sum of Elements With Frequency Divisible by K
⊣ 3713 Longest Balanced Substring I
⊣ 3715 Sum of Perfect Square Ancestors
⊣ 3720 Lexicographically Smallest Permutation Greater Than Target
⊣ 3737 Count Subarrays With Majority Element I
⊣ 3746 Minimum String Length After Balanced Removals (PRO)
⊣ 3785 Minimum Swaps to Avoid Forbidden Values
⊣ 3805 Count Caesar Cipher Pairs
⊣ 3839 Number of Prefix Connected Groups
⊣ 3843 First Element with Unique Frequency
⊣ 3848 Check Digitorial Permutation