# Chat room codeforces solution

E:Neko and Flashback. D2:Add on a Tree: Revolution. D:Palindrome XOR. Way Too Long Words. Mother bear.

Queries for Number of Palindromes. Anagram Search. Matrix Matcher. Page Numbers. Center Alignment. A Lot of Games. New Problem. African Crossword. Hard Work. Catholic dating uk Smallest String Concatenation.

Prefixes and Suffixes. Choosing Symbol Pairs. String Manipulation 1. Dima and Text Messages. Codeforces Beta Round 86 Div. Obsessive String. Prime Permutation. Codeforces Beta Round 92 Div. Alyona and Strings.

Sysadmin Bob. Famil Door and Brackets. Running Track. Sequence Formatting. A Simple Task. Fancy Number. Lucky Common Subsequence. Correcting Mistakes. Facetook Priority Wall. Grammar Lessons. Newspaper Headline. Codeforces Beta Round 75 Div. New Year and Ancient Prophecy. Spy Syndrome 2. Palindrome Degree. Lucky Transformation. Codeforces Beta Round 91 Div. Pretty Song. Making Genome in Berland. Kefa and Watch. Om Nom and Necklace. Text Messaging. Codeforces Beta Round 77 Div.

Two Strings. Dreamoon and Strings. Restoring IPv6. Sereja and Periods. Work Group. Codeforces Beta Round 94 Div. Alphabetic Relation. Martian Strings. Unique Strings. Wizards and Minimal Spell. Substitutes in Number. Spelling Check. Do the Untwist. Fedor and Essay. Tree-String Problem. Ann and Half-Palindrome. G2:Playlist for Polycarp hard version. B:Split a Number. A:Filling Shapes. B:Plus from Picture. C:Beautiful Lyrics. D:Complete Mirror.

E:Product Oriented Recurrence. F:Maximum Sine. A:Divide it! B:Merge it! C:Lose it! D:Recover it! E:Cover it! F:Destroy it! A:Nauuo and Cards. B:Nauuo and Circle. C1:Nauuo and Pictures easy version. C2:Nauuo and Pictures hard version. D:Nauuo and Portals. E:Nauuo and ODT. F:Nauuo and Bug. A:Nauuo and Votes. B:Nauuo and Chess. C:Nauuo and Cards. D:Nauuo and Circle. E1:Nauuo and Pictures easy version. E2:Nauuo and Pictures hard version. F:Nauuo and Portals. Educational Codeforces Round 66 Rated for Div.

A:From Hero to Zero. B:Catch Overflow! D:Array Splitting. E:Minimal Segment Cover. F:The Number of Subpermutations. G:Yet Another Partiton Problem. A:Ehab Fails to Be Thanos. B:Ehab Is an Odd Person. C:Ehab and a Special Coloring Problem. F:Ehab and the Big Finale. Codeforces Global Round 3 [Virtual]. B:Born This Way. C:Crazy Diamond. E:Earth Wind and Fire. F:Foo Fighters. G:Gold Experience. H:Holy Diver. Testing Round 15 Unrated [Virtual]. A:Digits Sequence Easy Edition.

B:Digits Sequence Hard Edition. Kotlin Heroes [Virtual]. A:Three Integers Again. B:Bad Days. C:Minus and Minus Give Plus. D:Decoding of Integer Sequences. E:Sliding Doors. G:Graph Decomposition. Chat room codeforces solution Saw. I:Good Subsets.

A:Increasing by Modulo. B:Good Triple. C:And Reachability. D:Anagram Paths. E:Xor Permutations. A:Circle Metro. C:Increasing by Chat room codeforces solution. D:Good Triple. E:And Reachability. A:Silent Classroom. B:All the Vowels Please. C:A Tale of Two Lands.

D:Cute Sequences. F:Vicky's Delivery Service. Educational Codeforces Round 65 Rated for Div. A:Telephone Number. B:Lost Numbers. C:News Distribution. D:Bicolored RBS. E:Range Deleting. F:Scalar Queries. G:Low Budget Inception.

B:Polycarp Training. C:Good String. D:Almost All Divisors. E:Two Arrays and Sum of Functions.

Chat room 58A codeforces easy solution -- c/c++ programmingF1:Microtransactions easy version. F2:Microtransactions hard version. A:The Party and Sweets. B:The minimal unique substring.

C:Permutation recovery. D:Winding polygonal line. E:Strange device. F:Density of subarrays. A:A pile of stones. B:Expansion coefficient of the array. C:The Party and Sweets.

D:The minimal unique substring. E:Permutation recovery. F:Winding polygonal line. A:Eating Soup. B1:Cat Party Easy Edition.

B2:Cat Party Hard Edition. C1:Power Transmission Easy Chat room codeforces solution. C2:Power Transmission Hard Edition. D:Mysterious Code. E:Magical Permutation. F:Indecisive Taxi Fee. A:Hide and Seek. B:Chladni Figure. C:Thanos Nim. D:Palindrome XOR. E:Rainbow Coins. F:Zigzag Game. A:Zoning Restrictions Again. B:Double Matrix.

C:Hide and Seek. D:Chladni Figure. E:Thanos Nim. F:Palindrome XOR. Educational Codeforces Round 64 Rated for Div. A:Inscribed Figures. B:Ugly Pairs. C:Match Points.

E:Special Segments of Permutation. F:Card Bag. VRt Contest marathon [Virtual]. A:Prefix Sum Primes. B:Three Religions. D:Abandoning Roads. E:Election Promises. A:Stock Arbitraging.

B:Tiling Challenge. C:Prefix Sum Primes. D:Three Religions. A:Reachable Numbers. B:Long Number. C1:Increasing Subsequence easy version. C2:Increasing Subsequence hard version. E:Minimum Array. F:Maximum Balanced Circle. G:Inverse of Rows and Columns. A:Neko Finds Grapes. C:Neko does Maths. D:Neko and Aki's Prank. E:Neko and Flashback. Educational Codeforces Round 63 Rated for Div. A:Reverse a Substring. B:Game with Telephone Numbers. C:Alarm Clocks Everywhere.

D:Beautiful Chat room codeforces solution. E:Guess the Root. F:Delivery Oligopoly. A:Love "A". B:Hate "A". C:Tree Diameter. D:Frog Jumping. E:Hot is Cold. F:Leaf Partition. G:Zoning Restrictions. H:Satanic Panic. A:Maxim and Biology. C:Problem for Nazar. D:Stas and the Queue at the Buffet. E:Number of Components.

F:Sonya and Informatics. A:Restoring Three Numbers. B:Make Them Equal. C:Gourmet Cat. D:Walking Robot. E:Two Teams.

F:Shovels Shop. A:Serval and Bus. B:Serval and Toy Bricks. C:Serval and Parenthesis Sequence. D:Serval and Rooted Tree. E:Serval and Snake. F:Serval and Bonus Problem. Codeforces Global Round 2 [Virtual]. A:Ilya and a Colorful Walk. B:Alyona and a Narrow Fridge. C:Ramesses and Corner Inversion. D:Frets On Fire. E:Pavel and Triangles.

F:Niyaz and Small Degrees. G:Get Ready for the Battle. April Fools Day Contest [Virtual]. A:Thanos Sort. B:Kanban Numbers.

C:Mystery Circuit. D:Pigeon d'Or. E:Fourier Doodles. F:Neat Words. G:AI Takeover. A:Diverse Strings. B:Parity Alternated Deletions. C:Two Shuffled Sequences.

D:Equalize Them All. E:Median String. G:Two Merged Sequences. A:The Beatles. B:Lynyrd Skynyrd. E:Pink Floyd. A:The Doors. D:The Beatles. E:Lynyrd Skynyrd.

Educational Codeforces Round 62 Rated for Div. A:Detective Book. B:Good String. D:Minimum Triangulation. E:Palindrome-less Arrays.

F:Extending Set of Points. G:Double Tree. A:Even Substrings. C:Edgy Trees. D:Steps to One. E:Maximize Mex. F:Dish Shopping. A:Game B:Maximal Continuous Rest. C:Polycarp Restores Permutation. D:Colored Boots. E:Superhero Battle. F1:Same Sum Blocks Easy. F2:Same Sum Blocks Hard. G:Privatization of Roads in Treeland.

A:Nastya Is Reading a Book. C:Nastya Is Transposing Matrices. D:Nastya Is Buying Lunch. E:Nastya Hasn't Written a Legend. B:Camp Schedule. C:Museums Tour. D:Cooperative Game. E:Train Car Selection. A:Sushi for Two.

D:Camp Schedule. E:Museums Tour. F:Cooperative Game. A:Middle of the Contest. B:Preparation for International Women's Day. C:Balanced Team. D:Zero Quantity Maximization. E:K Balanced Teams. F1:Spanning Tree with Maximum Degree. Educational Codeforces Round 61 Rated for Div. A:Regular Bracket Sequence. C:Painting the Fence. D:Stressful Training. F:Clear the String. G:Greedy Subsequences. A:Diana and Liana. B:Once in a casino. C:Compress String.

D:Power Tree. E:The very same Dating russian girl meme. F:Secret Letters.

A:Technogoblet of Fire. B:Mike and Children. C:System Testing. D:Diana and Liana. E:Once in a casino. F:Compress String. A2:Generate equal superposition of four basis states. B1:Distinguish three-qubit states. B2:Not A, not B or not C? C1:Alternating bits oracle. C2:"Is the bit string periodic? C3:"Is the number of ones divisible by 3? D1:Block diagonal matrix. D2:Pattern of increasing blocks.

D3:X-wing fighter. D4:TIE fighter. D6:Hessenberg matrix. A1:Toy Train Simplified. A2:Toy Train. B:Wrong Answer. C:Morse Code. E:Legendary Tree.

EOI-Codeforces.A Chat roomA:Be Positive. B:Two Cakes. D1:Toy Train Simplified. D2:Toy Train. E:Wrong Answer.

MATURE WOMEN NUDE IN PUBLICA:Sea Battle. D:Gourmet choice. E:String Multiplication. F:Asya And Kittens. G:Most Dangerous Shark. G1:AND oracle. G2:OR oracle. G3:Palindrome checker oracle. U1:Anti-diagonal unitary. U2:Chessboard unitary. U3:Block unitary. A:Water Buying. B:Tanya and Candies. C:Palindromic Matrix. D1:Coffee and Coursework Easy version.

D2:Coffee and Coursework Hard Version. E:Yet Another Ball Problem. F1:Tree Cutting Easy Version. F2:Tree Cutting Hard Version. Educational Codeforces Round 60 Rated for Div. A:Best Subsegment.

## CodeForces 58A chat chat chat all the way! Chat room

C:Magic Ship. D:Magic Gems. E:Decypher the String. F:Crisp String. G:Recursive Queries.

## Chat room codeforces solution

A:Sasha and a Bit of Relax. B:Sasha and One More Name. C:Sasha and a Patient Friend. E:Sasha and a Very Easy Test. F:Sasha and Algorithm of Silence's Sounds. A:Sasha and His Trip. B:Sasha and Magnetic Machines. C:Sasha and a Bit of Relax. D:Sasha and One More Name. E:Sasha and a Patient Friend. A:Got Any Grapes? C:Trailing Loves or L'oeufs? D:Flood Fill. E:Arithmetic Progression. F:Please, another Queries on Array? Codeforces Global Round 1 [Virtual].

C:Meaningless Operations. E:Magic Stones. F:Nearest Leaf. H:Modest Substrings. CodeCraft and Codeforces Round Div. A:Superhero Transformation. B:Average Superhero Gang Power. C:Creative Snap. D:Destroy the Colony. D:Lunar New Year and a Wander. Problem A. Chat room Solution is greedy algorithm. The first thing we do is find in our string the first chat room codeforces solution 'h'.

WHERE CAN I MEET A NICE GUYThen we find letter 'e' which is righter that found 'h'. If we find the whole word 'hello' in such way, obliviously, answer is YES. Now let's prove that if answer exists, we find it. Let see on position of the 'h' in right answer. If we move it to the first 'h' in our string, nothing changes. But now we can say that our greedy chat room codeforces solution correctly Fast flirting let's do such with the second letter, and so on.

We have greedy algorithm with work time O nwhere n - length of the input. Problem B. Coins This problem also have greedy solution: we run down all number from 2 and greater and while denomination of the last added to answer coin is divisible by current number, we divide and increase answer.

You can prove correctness, if you take a look at prime factorizations of coins' denominations. In each next denomination each prime have less or equal power than the current one it's equivalent to ' a divide b '. So, in the optimal answer sum of degrees decreasing at exactly one.

Our greedy algorithm do exactly what it need. Problem C. The first thing we notice - beautiful sequence is can be determined with any member. The next thing chat room codeforces solution at least one tree will remain the same height. Prove: let's fix height of the first tree, and correct heights of all other ones. Obliviously, they all remain positive.