前言

灵茶山刷题俱乐部每日一题题解，主要用于自己学习，跟着灵佬变强。

通常每周$5$题，如果某天有不止一题，说明当天有进阶的附加题，附加题只做有$OJ$可以测试的，每周的题目用一个空行隔开。由于周四、周五的题目难度较大，不一定每题都会写解，但学会之后一定会补上。

由于$Acwing$“借鉴”$LeetCode$的难度划分，只有简单、中等和困难三种难度。所以对本题单的题目难度做一个粗略地对齐。

对于$Codeforces$上面的题目：

1. $rating \lt 1200$被视为简单。
2. $1200 \leq rating \leq 1700$被视为中等。
3. $rating \geq 1800$被视为困难。

对于$Atcoder$上面的题目：

1. $rating \lt 800$被视为简单。
2. $800 \leq rating \lt 1600$被视为中等。
3. $rating \geq 1600$被视为困难。

灵茶项目是从$2022$年$4$月$8$日开始启动的，但我跟的时候已经进行了一年多了，所以前面有很多题目没补。如有需求还以可以去灵茶的原文档查看题目。

题单

2025-05-21:Codeforces 1884C. Medium Design
2025-05-20:Codeforces 1166A. A Tale of Two Lands
2025-05-19:Codeforces 1270B. Interesting Subarray

2025-05-16:Codeforces 1701E. Text Editor
2025-05-15:Codeforces 645D. Robot Rapping Results Report
2025-05-14:Codeforces 1209D. Cow and Snacks
2025-05-13:AtCoder ABC367D. Pedometer
2025-05-12:Codeforces 1006C. Three Parts of the Array

2025-05-09:Codeforces 1739E. Cleaning Robot
2025-05-08:洛谷 P3572. [POI 2014] PTA-Little Bird
2025-05-07:洛谷 P2513. [HAOI2009] 逆序对数列
2025-05-06:Codeforces 2093D. Skibidi Table
2025-05-05:Codeforces 1989B. Substring and Subsequence

2025-05-02:Codeforces 543C. Remembering Strings
2025-05-01:洛谷 P3694. 邦邦的大合唱站队
2025-04-30:洛谷 P4310. 绝世好题
2025-04-29:Codeforces 1141C. Polycarp Restores Permutation
2025-04-28:AtCoder ABC212D. Querying Multiset

2025-04-25:Codeforces 825F. String Compression
2025-04-24:AtCoder ABC332F. Random Update Query
2025-04-23:洛谷 P1966. [NOIP 2013 提高组] 火柴排队
2025-04-22:AtCoder ABC346D. Gomamayo Sequence
2025-04-21:AtCoder ABC353D. Another Sigma Problem

2025-04-18:Codeforces 1866K. Keen Tree Calculation
2025-04-17:洛谷 P3957. [NOIP 2017 普及组] 跳房子
2025-04-16:洛谷 P1725. 琪露诺
2025-04-15:AtCoder ABC347D. Popcount and XOR
2025-04-14:AtCoder ABC372D. Buildings

2025-04-11:Codeforces 631E. Product Sum
2025-04-10:Codeforces 474F. Ant colony
2024-04-09:洛谷 P2627. [USACO11OPEN] Mowing the Lawn G
2025-04-08:Codeforces 1791F. Range Update Point Query
2025-04-07:Codeforces 2074C. XOR and Triangle

2025-04-04:AtCoder ABC373F. Knapsack with Diminishing Values
2025-04-03:Codeforces 1175D. Array Splitting
2025-04-02:AtCoder ABC343F. Second Largest Query
2025-04-01:Codeforces 1492C. Maximum width
2025-03-31:Codeforces 476A. Dreamoon and Stairs

2025-03-28:Codeforces 30E. Tricky and Clever Password
2025-03-27:Codeforces 335B. Palindrome
2025-03-26:AtCoder ABC378E. Mod Sigma Problem
2025-03-25:AtCoder ABC286E. Souvenir
2025-03-24:Codeforces 2065D. Skibidus and Sigma

2025-03-21:AtCoder ABC360F. Suitable Edit for LIS
2025-03-20:Codeforces 2014F. Sheriff’s Defense
2025-03-19:Codeforces 446A. DZY Loves Sequences
2025-03-18:Codeforces 709B. Checkpoints
2025-03-17:Codeforces 1931C. Make Equal Again

2025-03-14:Codeforces 557E. Ann and Half-Palindrome
2025-03-13:Codeforces 145C. Lucky Subsequence
2025-03-12:Codeforces 150B. Quantity of Strings
2025-03-11:Codeforces 212E. IT Restaurants
2025-03-10:Codeforces 1900C. Anji’s Binary Tree

2025-03-07:Codeforces 17E. Palisection
2025-03-06:Codeforces 835D. Palindromic characteristics
2025-03-05:Codeforces 137D. Palindromes
2025-03-04:Codeforces 159D. Palindrome pairs
2025-03-03:Codeforces 1420B. Rock and Lever

2025-02-28:AtCoder AGC015C. Nuske vs Phantom Thnook
2025-02-27:AtCoder ABC321F. #(subset sum = K) with Add and Erase
2025-02-26:AtCoder ABC348E. Minimize Sum of Distances
2025-02-25:AtCoder ABC371E. I Hate Sigma Problems
2025-02-24:Codeforces 327A. Flipping Game

2025-02-21:AtCoder ABC163F. path pass i
2025-02-20:AtCoder ABC218F. Blocked Roads
2025-02-19:AtCoder ABC100D. Patisserie ABC
2025-02-18:Codeforces 1974D. Ingenuity-2
2025-02-17:Codeforces 1788B. Sum of Two Numbers

2025-02-14:AtCoder ARC107D. Number of Multisets
2025-02-13:AtCoder ABC215F. Dist Max 2
2025-02-12:AtCoder tenka1-2017 D. IntegerotS
2025-02-11:AtCoder ABC281D. Max Multiple
2025-02-10:Codeforces 1909B. Make Almost Equal With Mod

2025-02-07:AtCoder ABC194F. Digits Paradise in Hexadecimal
2025-02-06:AtCoder ABC129E. Sum Equals Xor
2025-02-05:AtCoder ABC117D. XXOR
2025-02-04:Codeforces 1878E. Iva & Pav
2025-02-03:AtCoder ABC367F. Rearrange Query
2025-02-03:Codeforces 1996C. Sort

2025-01-31:AtCoder aising2020E. Camel Train
2025-01-31:洛谷 P2949. [USACO09OPEN] Work Scheduling G
2025-01-30:AtCoder ABC146F. Rem of Sum is Num
2025-01-29:AtCoder ABC133E. Virus Tree 2
2025-01-28:Codeforces 1932C. LR-remainders
2025-01-27:Codeforces 2037C. Superultra’s Favorite Permutation

2025-01-24:AtCoder ABC160F. Distributing Integers
2025-01-23:AtCoder ABC381F. 1122 Subsequence
2025-01-22:AtCoder ABC356E. Max/Min
2025-01-21:AtCoder ABC376E. Max × Sum
2025-01-20:Codeforces 1364A. XXXXX

2025-01-17:AtCoder ARC183C. Not Argmax
2025-01-16:AtCoder ABC379F. Buildings 2
2025-01-15:AtCoder ABC375F. Road Blocked
2025-01-14:Codeforces 1923C. Find B
2025-01-13:Codeforces 2019B. All Pairs Segments

2025-01-10:AtCoder ARC189D. Takahashi is Slime
2025-01-09:AtCoder ABC282E. Choose Two and Eat One
2025-01-08:Codeforces 2045A. Scrambled Scrabble
2025-01-07:Codeforces 1789C. Serval and Toxel’s Arrays
2025-01-06:Codeforces 2048C. Kevin and Binary Strings

2025-01-03:Codeforces 2042F. Two Subarrays
2025-01-02:Codeforces 2044H. Hard Demon Problem
2025-01-01:Codeforces 2009F. Firefly’s Queries
2024-12-31:Codeforces 2045C. Saraga
2024-12-30:Codeforces 2033D. Kousuke’s Assignment

2024-12-27:Codeforces 2000H. Ksyusha and the Loaded Set
2024-12-26:Codeforces 2045I. Microwavable Subsequence
2024-12-25:Codeforces 2042C. Competitive Fishing
2024-12-24:Codeforces 2040C. Ordered Permutations
2024-12-23:Codeforces 2020C. Bitwise Balancing

2024-12-20:Codeforces 2045H. Missing Separators
2024-12-19:Codeforces 2042D. Recommendations
2024-12-18:Codeforces 2050F. Maximum modulo equality
2024-12-17:Codeforces 1842C. Tenzing and Balls
2024-12-16:Codeforces 2008F. Sakurako’s Box

2024-12-13:Codeforces 1906H. Twin Friends
2024-12-12:Codeforces 1899G. Unusual Entertainment
2024-12-11:Codeforces 2028C. Alice’s Adventures in Cutting Cake
2024-12-10:Codeforces 276C. Little Girl and Maximum Sum
2024-12-09:Codeforces 1980D. GCD-sequence

2024-12-06:Codeforces 954I. Yet Another String Matching Problem
2024-12-05:Codeforces 1906F. Maximize The Value
2024-12-04:Codeforces 1324F. Maximum White Subtree
2024-12-03:Codeforces 2027C. Add Zeros
2024-12-02:Codeforces 2026B. Black Cells

2024-11-29:Codeforces 1045G. AI robots
2024-11-28:Codeforces 2026D. Sums of Segments
2024-11-27:Codeforces 2010C2. Message Transmission Error (hard version)
2024-11-26:Codeforces 1844C. Particles
2024-11-25:Codeforces 2032C. Trinity

2024-11-22:Codeforces 1730D. Prefixes and Suffixes
2024-11-21:Codeforces 1957D. A BIT of an Inequality
2024-11-20:Codeforces 666A. Reberland Linguistics
2024-11-19:Codeforces 1920C. Partitioning the Array
2024-11-18:Codeforces 318B. Strings of Power

2024-11-15:Codeforces 903F. Clear The Matrix
2024-11-14:Codeforces 1969D. Shop Game
2024-11-13:Codeforces 2025D. Attribute Checks
2024-11-12:Codeforces 204A. Little Elephant and Interval
2024-11-11:Codeforces 1881D. Divide and Equalize

2024-11-08:Codeforces 2005D. Alter the GCD
2024-11-07:Codeforces 2009G2. Yunli’s Subarray Queries (hard version)
2024-11-06:Codeforces 1793D. Moscow Gorillas
2024-11-05:Codeforces 1881E. Block Sequence
2024-11-04:Codeforces 1973B. Cat, Fox and the Lonely Array

2024-11-01:Codeforces 1609E. William The Oblivious
2024-10-31:Codeforces 1891F. A Growing Tree
2024-10-30:Codeforces 2020D. Connect the Dots
2024-10-29:Codeforces 1148B. Born This Way
2024-10-28:Codeforces 1265B. Beautiful Numbers

2024-10-25:Codeforces 379F. New Year Tree
2024-10-24:Codeforces 2013D. Minimize the Difference
2024-10-23:Codeforces 1986E. Beautiful Array
2024-10-22:Codeforces 1798D. Shocking Arrangement
2024-10-21:Codeforces 1904C. Array Game

2024-10-18:Codeforces 1700E. Serega the Pirate
2024-10-17:Codeforces 109C. Lucky Tree
2024-10-16:Codeforces 914C. Travelling Salesman and Special Numbers
2024-10-15:Codeforces 1795C. Tea Tasting
2024-10-14:Codeforces 1955D. Inaccurate Subsequence Search

2024-10-11:Codeforces 1672H. Zigu Zagu
2024-10-10:Codeforces 1974G. Money Buys Less Happiness Now
2024-10-09:Codeforces 1974E. Money Buys Happiness
2024-10-08:Codeforces 1208B. Uniqueness
2024-10-07:Codeforces 1187B. Letters Shop

2024-10-04:Codeforces 758E. Broken Tree（太难了搞不定）
2024-10-03:Codeforces 1624F. Interacdive Problem
2024-10-02:Codeforces 1984C2. Magnitude (Hard Version)
2024-10-01:Codeforces 2008E. Alternating String
2024-09-30:Codeforces 1498B. Box Fitting

2024-09-27:Codeforces 2004F. Make a Palindrome
2024-09-26:Codeforces 1203D2. Remove the Substring (hard version)
2024-09-26:Codeforces 762C. Two strings
2024-09-25:Codeforces 761D. Dasha and Very Difficult Problem
2024-09-24:Codeforces 812C. Sagheer and Nubian Market
2024-09-23:Codeforces 1983C. Have Your Cake and Eat It Too

2024-09-20:Codeforces 1107F. Vasya and Endless Credits
2024-09-19:Codeforces 1919D. 01 Tree
2024-09-18:Codeforces 1881F. Minimum Maximum Distance
2024-09-17:Codeforces 1997D. Maximize the Root
2024-09-16:Codeforces 628B. New Skateboard

2024-09-13:Codeforces 1503D. Flip the Cards
2024-09-12:Codeforces 1920E. Counting Binary Strings
2024-09-11:Codeforces 1864D. Matrix Cascade
2024-09-10:Codeforces 1924A. Did We Get Everything Covered?
2024-09-09:Codeforces 1895C. Torn Lucky Ticket

2024-09-06:Codeforces 1301F. Super Jaber
2024-09-05:Codeforces 213B. Numbers
2024-09-04:Codeforces 1969C. Minimizing the Sum
2024-09-03:Codeforces 115B. Lawnmower
2024-09-02:Codeforces 437C. The Child and Toy

2024-08-30:Codeforces 1237F. Balanced Domino Placements
2024-08-29:Codeforces 1650G. Counting Shortcuts
2024-08-28:Codeforces 622C. Not Equal on a Segment
2024-08-27:Codeforces 1765K. Torus Path
2024-08-26:Codeforces 1955C. Inhabitant of the Deep Sea

2024-08-23:Codeforces 1227G. Not Same
2024-08-22:Codeforces 1902D. Robot Queries
2024-08-21:Codeforces 1468J. Road Reform
2024-08-20:Codeforces 1875C. Jellyfish and Green Apple
2024-08-19:Codeforces 1937B. Binary Path

2024-08-16:Codeforces 1592F1. Alice and Recoloring 1
2023-08-15:AtCoder ABC357F. Two Sequence Queries
2024-08-14:Codeforces 1946C. Tree Cutting
2024-08-13:Codeforces 1292A. NEKO’s Maze Game
2024-08-12:Codeforces 1902C. Insert and Equalize

2024-08-09:Codeforces 1906B. Button Pressing
2023-08-08:AtCoder ABC253F. Operations on a Matrix
2024-08-07:Codeforces 1822F. Gardening Friends
2023-08-06:AtCoder ABC359D. Avoid K Palindrome
2023-08-05:AtCoder ABC249D. Index Trio

2024-08-02:Codeforces 1934D2. XOR Break — Game Version
2024-08-01:Codeforces 1934D1. XOR Break — Solo Version
2024-07-31:Codeforces 1870D. Prefix Purchase
2024-07-30:Codeforces 1905C. Largest Subsequence
2024-07-29:Codeforces 1037C. Equalize

2024-07-26:Codeforces 1863F. Divide, XOR, and Conquer
2024-07-25:Codeforces 985E. Pencils and Boxes
2024-07-24:Codeforces 1935C. Messenger in MAC
2024-07-23:Codeforces 1901C. Add, Divide and Floor
2024-07-22:Codeforces 1372B. Omkar and Last Class of Math

2024-07-19:Codeforces 1185G2. Playlist for Polycarp
2024-07-18:Codeforces 1167E. Range Deleting
2024-07-17:Codeforces 1893B. Neutral Tonality
2024-07-16:Codeforces 1891C. Smilo and Monsters
2024-07-15:Codeforces 1922C. Closest Cities

2024-07-12:Codeforces 1778F. Maximizing Root
2024-07-11:Codeforces 582B. Once Again…
2024-07-10:Codeforces 1725M. Moving Both Hands
2024-07-09:Codeforces 1670C. Where is the Pizza?
2024-07-08:Codeforces 1927D. Find the Different Ones!

2024-07-05:Codeforces 633F. The Chocolate Spree
2024-07-04:Codeforces 455C. Civilization
2024-07-03:Codeforces 1849D. Array Painting
2024-07-02:Codeforces 1903C. Theofanis’ Nightmare
2024-07-01:Codeforces 1840D. Wooden Toy Festival

2024-06-28:Codeforces 797F. Mice and Holes
2024-06-27:Codeforces 1851G. Vlad and the Mountains
2024-06-26:Codeforces 1862E. Kolya and Movie Theatre
2024-06-25:Codeforces 1883F. You Are So Beautiful
2024-06-24:Codeforces 1759E. The Humanoid

2024-06-21:Codeforces 1400G. Mercenaries
2024-06-20:Codeforces 1926G. Vlad and Trouble at MIT
2024-06-19:Codeforces 1950F. 0, 1, 2, Tree!
2024-06-18:Codeforces 976C. Nested Segments
2024-06-17:Codeforces 1077C. Good Array

2024-06-14:Codeforces 1584F. Strange LCS
2024-06-13:Codeforces 1237D. Balanced Playlist
2024-06-12:Codeforces 1879D. Sum of XOR Functions
2024-06-11:Codeforces 1362C. Johnny and Another Rating Drop
2024-06-10:Codeforces 1364B. Most socially-distanced subsequence

2024-06-07:Codeforces 650D. Zip-line
2024-06-06:Codeforces 264C. Choosing Balls
2024-06-05:Codeforces 898D. Alarm Clock
2024-06-04:Codeforces 985C. Liebig’s Barrels
2024-06-03:Codeforces 1873F. Money Trees

2024-05-31:Codeforces 486E. LIS of Sequence
2024-05-31:AtCoder ABC354F. Useless for LIS
2024-05-30:Codeforces 1796D. Maximum Subarray
2024-05-29:Codeforces 1843E. Tracking Segments
2024-05-28:Codeforces 608B. Hamming Distance Sum
2024-05-27:Codeforces 1343C. Alternating Subsequence

2024-05-24:洛谷 P5369 [PKUSC2018] 最大前缀和（太难了搞不定）
2024-05-24:LeetCode 526. 优美的排列
2024-05-23:Codeforces 451E. Devu and Flowers
2024-05-22:Codeforces 1689C. Infected Tree
2024-05-21:Codeforces 760B. Frodo and pillows
2024-05-20:Codeforces 1354B. Ternary String

2024-05-17:Codeforces 1884D. Counting Rhyme
2024-05-16:Codeforces 1878F. Vasilije Loves Number Theory
2024-05-15:Codeforces 1165E. Two Arrays and Sum of Functions
2024-05-14:Codeforces 576A. Vasya and Petya’s Game
2024-05-13:Codeforces 251A. Points on Line

2024-05-10:Codeforces 1209F. Koala and Notebook
2024-05-09:Codeforces 938D. Buy a Ticket
2024-05-08:Codeforces 1714D. Color with Occurrences
2024-05-07:Codeforces 991C. Candies
2024-05-06:Codeforces 1759D. Make It Round

2024-05-03:Codeforces 1416D. Graph and Queries
2024-05-02:Codeforces 213C. Relay Race
2024-05-01:Codeforces 1777C. Quiz Master
2024-04-30:Codeforces 1029C. Maximal Intersection
2024-04-29:Codeforces 1365C. Rotation Matching

2024-04-26:Codeforces 1401F. Reverse and Swap
2024-04-25:Codeforces 1547G. How Many Paths
2024-04-24:Codeforces 1883E. Look Back
2024-04-23:Codeforces 1775B. Gardener and the Array
2024-04-22:Codeforces 940B. Our Tanya is Crying Out Loud

2024-04-19:Codeforces 911F. Tree Destruction
2024-04-18:洛谷 P7167. [eJOI2020 Day1] Fountain
2024-04-18:Codeforces 371D. Vessels
2024-04-17:Codeforces 1065C. Make It Equal
2024-04-16:Codeforces 1304C. Air Conditioner
2024-04-15:Codeforces 988C. Equal Sums

2024-04-12:Codeforces 1491F. Fib-tree
2024-04-11:Codeforces 296B. Yaroslav and Two Strings
2024-04-10:Codeforces 1875D. Jellyfish and Mex
2024-04-09:Codeforces 1607D. Blue-Red Permutation
2024-04-08:Codeforces 1692F. 3SUM

2024-04-05:Codeforces 730I. Olympiad in Programming and Sports
2024-04-04:Codeforces 371E. Subway Innovation
2024-04-03:Codeforces 1623C. Balanced Stone Heaps
2024-04-02:Codeforces 1299A. Anu Has a Function
2024-04-01:Codeforces 1538C. Number of Pairs

2024-03-29:Codeforces 749E. Inversions After Shuffle
2024-03-28:Codeforces 620E. New Year Tree
2024-03-27:Codeforces 1137B. Camp Schedule
2024-03-26:Codeforces 166C. Median
2024-03-25:Codeforces 1443B. Saving the City

2024-03-22:Codeforces 145E. Lucky Queries
2024-03-21:Codeforces 1187E. Tree Painting
2024-03-20:Codeforces 383A. Milking cows
2024-03-19:Codeforces 1547E. Air Conditioners
2024-03-18:Codeforces 870C. Maximum splitting

2024-03-15:Codeforces 1837F. Editorial for Two
2024-03-14:Codeforces 1744F. MEX vs MED
2024-03-13:Codeforces 1702E. Split Into Two Sets
2024-03-12:Codeforces 845C. Two TVs
2024-03-11:Codeforces 45I. TCMCF+++

2024-03-08:Codeforces 1436E. Complicated Computations
2024-03-07:Codeforces 895C. Square Subsets
2024-03-06:Codeforces 1775C. Interesting Sequence
2024-03-05:Codeforces 1513B. AND Sequences
2024-03-04:Codeforces 650A. Watchmen

2024-03-01:Codeforces 3D. Least Cost Bracket Sequence
2024-02-29:Codeforces 383C. Propagating tree
2024-02-28:Codeforces 696B. Puzzles
2024-02-27:Codeforces 1541B. Pleasant Pairs
2024-02-26:Codeforces 1178B. WOW Factor

2024-02-23:Codeforces 916E. Jamie and Tree（太难了搞不定）
2024-02-22:Codeforces 432D. Prefixes and Suffixes
2024-02-21:Codeforces 1198B. Welfare State
2024-02-20:Codeforces 1730C. Minimum Notation
2024-02-19:Codeforces 934A. A Compatible Pair

2024-02-16:Codeforces 55D. Beautiful numbers
2024-02-15:Codeforces 1267L. Lexicography
2024-02-14:Codeforces 659E. New Reform
2024-02-13:Codeforces 1706C. Qpwoeirut And The City
2024-02-12:Codeforces 1738B. Prefix Sum Addicts

2024-02-09:Codeforces 23C. Oranges and Apples
2024-02-08:Codeforces 1872G. Replace With Product
2024-02-07:Codeforces 1822E. Making Anti-Palindromes
2024-02-06:Codeforces 1771B. Hossam and Friends
2024-02-05:Codeforces 1747C. Swap Game

2024-02-02:Codeforces 1730E. Maximums and Minimums
2024-02-01:Codeforces 1800F. Dasha and Nightmares
2024-01-31:Codeforces 500C. New Year Book Reading
2024-01-30:Codeforces 1717C. Madoka and Formal Statement
2024-01-29:Codeforces 489B. BerSU Ball

2024-01-26:Codeforces 1515F. Phoenix and Earthquake
2024-01-25:Codeforces 309C. Memory for Arrays
2024-01-24:Codeforces 1610C. Keshi Is Throwing a Party
2024-01-23:Codeforces 91B. Queue
2024-01-22:Codeforces 1748B. Diverse Substrings

2024-01-19:Codeforces 1830C. Hyperregular Bracket Strings
2024-01-18:Codeforces 1821E. Rearrange Brackets
2024-01-17:Codeforces 607A. Chain Reaction
2024-01-16:Codeforces 1837D. Bracket Coloring
2024-01-15:Codeforces 1701C. Schedule Management

2024-01-12:Codeforces 1761E. Make It Connected
2024-01-11:Codeforces 1768D. Lucky Permutation
2024-01-10:Codeforces 1781C. Equal Frequencies
2024-01-09:Codeforces 990C. Bracket Sequences Concatenation Problem
2024-01-08:Codeforces 1096C. Yuhao and a Parenthesis

2024-01-05:Codeforces 1270G. Subset with Zero Sum
2024-01-04:Codeforces 463D. Gargari and Permutations
2024-01-03:Codeforces 1849C. Binary String Copying
2024-01-02:Codeforces 1800E2. Unforgivable Curse (hard version)
2024-01-01:Codeforces 1790E. Vlad and a Pair of Numbers

2023-12-29:Codeforces 547D. Mike and Fish
2023-12-28:Codeforces 1854A2. Dual (Hard Version)
2023-12-28:Codeforces 1854A1. Dual (Easy Version)
2023-12-27:Codeforces 923B. Producing Snow
2023-12-26:Codeforces 817B. Makes And The Product
2023-12-25:Codeforces 1251B. Binary Palindromes

2023-12-22:Codeforces 1334F. Strange Function
2023-12-21:Codeforces 1895D. XOR Construction
2023-12-20:Codeforces 1730B. Meeting on the Line
2023-12-19:Codeforces 702C. Cellular Network
2023-12-18:Codeforces 962C. Make a Square

2023-12-15:Codeforces 1749E. Cactus Wall
2023-12-14:Codeforces 1861D. Sorting By Multiplication
2023-12-13:Codeforces 1886C. Decreasing String
2023-12-12:Codeforces 620C. Pearls in a Row
2023-12-11:Codeforces 888C. K-Dominant Character

2023-12-08:Codeforces 1327F. AND Segments
2023-12-07:洛谷 P3594. [POI2015] WIL
2023-12-06:Codeforces 369C. Valera and Elections
2023-12-05:Codeforces 1236B. Alice and the List of Presents
2023-12-04:Codeforces 920C. Swap Adjacent Elements

2023-12-01:Codeforces 833B. The Bakery
2023-11-30:洛谷 P2679. [NOIP2015 提高组] 子串
2023-11-29:Codeforces 525C. Ilya and Sticks
2023-11-28:Codeforces 1898B. Milena and Admirer
2023-11-27:Codeforces 1009B. Minimum Ternary String

2023-11-24:洛谷 P5283. 异或粽子
2023-11-23:Codeforces 69E. Subsegments
2023-11-22:Codeforces 534C. Polycarpus’ Dice
2023-11-21:Codeforces 1169B. Pairs
2023-11-20:Codeforces 804B. Minimum number of steps

2023-11-17:Codeforces 1665E. MinimizOR
2023-11-16:Codeforces 721C. Journey
2023-11-15:Codeforces 1861C. Queries for the Array
2023-11-14:Codeforces 1673C. Palindrome Basis
2023-11-13:Codeforces 1648A. Weird Sum

2023-11-10:Codeforces 1634F. Fibonacci Additions
2023-11-09:Codeforces 404D. Minesweeper 1D
2023-11-08:Codeforces 1140C. Playlist
2023-11-07:Codeforces 1106D. Lunar New Year and a Wander
2023-11-06:Codeforces 816B. Karen and Coffee

2023-11-03:Codeforces 13E. Holes
2023-11-02:Codeforces 1679D. Toss a Coin to Your Graph…
2023-11-01:Codeforces 777C. Alyona and Spreadsheet
2023-10-31:Codeforces 1180B. Nick and Array
2023-10-30:Codeforces 26B. Regular Bracket Sequence

2023-10-27:Codeforces 487B. Strip
2023-10-26:AtCoder ARC134D. Concatenate Subsequences
2023-10-25:Codeforces 750C. New Year and Rating
2023-10-24:Codeforces 864D. Make a Permutation!
2023-10-23:Codeforces 1443C. The Delivery Dilemma

2023-10-20:AtCoder ARC127D. Sum of Min of Xor（太难了搞不定）
2023-10-19:AtCoder ARC147C. Min Diff Sum
2023-10-18:Codeforces 1799C. Double Lexicographically Minimum
2023-10-17:Codeforces 1765N. Number Reduction
2023-10-16:Codeforces 1792C. Min Max Sort

2023-10-13:AtCoder ABC311G. One More Grid Task
2023-10-12:Codeforces 1678B2. Tokitsukaze and Good 01-String (hard version)
2023-10-11:Codeforces 1680C. Binary String
2023-10-10:Codeforces 1690E. Price Maximization
2023-10-09:AtCoder ABC321D. Set Menu

2023-10-06:AtCoder tenka1-2019 D. Three Colors
2023-10-05:AtCoder ABC279F. BOX
2023-10-04:AtCoder dwacon5th-prelims B. Sum AND Subarrays
2023-10-03:AtCoder ABC222D. Between Two Arrays
2023-10-02:AtCoder ABC125D. Flipping Signs

2023-09-29:AtCoder AGC15D. A or…or B Problem（太难了搞不定）
2023-09-28:AtCoder ABC208E. Digit Products
2023-09-27:AtCoder ARC98D. Xor Sum 2
2023-09-26:AtCoder ABC202D. aab aba baa
2023-09-25:AtCoder ABC138D. Ki

2023-09-22:AtCoder diverta2019E. XOR Partitioning（太难了搞不定）
2023-09-21:AtCoder ARC71B. ###
2023-09-20:AtCoder ARC158B. Sum-Product Ratio
2023-09-19:AtCoder ABC301D. Bitmask
2023-09-18:AtCoder ABC248D. Range Count Query

2023-09-15:AtCoder ARC136D. Without Carry
2023-09-14:AtCoder ABC155D. Pairs
2023-09-13:AtCoder code-festival-2016-qualc C. Two Alpinists
2023-09-12:AtCoder ARC137B. Count 1’s
2023-09-11:AtCoder ABC248C. Dice Sum

2023-09-08:AtCoder ABC243G. Sqrt
2023-09-07:AtCoder ABC309F. Box in Box
2023-09-06:AtCoder ABC194E. Mex Min
2023-09-05:AtCoder ABC308E. MEX
2023-09-04:AtCoder diverta2019C. AB Substrings

2023-09-01:AtCoder ARC92D. Two Sequences
2023-08-31:AtCoder ABC300F. More Holidays
2023-08-30:AtCoder ABC295D. Three Days Ago
2023-08-29:NowCoder NC256063. 游游的矩阵统计
2023-08-29:AtCoder ABC294E. 2xN Grid
2023-08-28:AtCoder ABC233D. Count Interval

2023-08-25:AtCoder ARC137C. Distinct Numbers
2023-08-24:AtCoder ABC298F. Rook Score
2023-08-23:AtCoder ABC300E. Dice Product 3
2023-08-22:AtCoder ABC296D. D - M<=ab
2023-08-21:AtCoder ABC298D. Writing a Numeral

2023-08-18:AtCoder ABC159F. Knapsack for All Segments
2023-08-17:AtCoder ABC301E. Pac-Takahashi
2023-08-16:AtCoder ABC290E. Make it Palindrome
2023-08-15:AtCoder ABC253E. Distance Sequence
2023-08-14:Codeforces 1728C. Digital Logarithm

2023-08-11:AtCoder ABC299G. Minimum Permutation
2023-08-10:AtCoder ABC281F. Xor Minimization
2023-08-09:AtCoder ABC214D. Sum of Maximum Weights
2023-08-08:AtCoder ABC262D. I Hate Non-integer Number
2023-08-07:AtCoder ABC280E. Critical Hit

2023-08-04:AtCoder ABC288F. Integer Division
2023-08-03:AtCoder ARC158C. All Pair Digit Sums
2023-08-02:Codeforces 1677B. Tokitsukaze and Meeting
2023-08-01:Codeforces 1811E. Living Sequence
2023-07-31:Codeforces 1276A. As Simple as One and Two

2023-07-28:Codeforces 1336C. Kaavi and Magic Spell
2023-07-27:Codeforces 796C. Bank Hacking
2023-07-26:Codeforces 193A. Cutting Figure
2023-07-25:Codeforces 746D. Green and Black Tea
2023-07-24:Codeforces 1772D. Absolute Sorting

2023-07-21:Codeforces 543D. Road Improvement
2023-07-20:Codeforces 1613D. MEX Sequences
2023-07-19:Codeforces 1765D. Watch the Videos
2023-07-18:Codeforces 191A. Dynasty Puzzles
2023-07-17:Codeforces 1195C. Basketball Exercise

2023-07-14:Codeforces 1238E. Keyboard Purchase
2023-07-13:Codeforces 981D. Bookshelves
2023-07-12:Codeforces 1516C. Baby Ehab Partitions Again
2023-07-11:Codeforces 991D. Bishwock
2023-07-10:Codeforces 698A. Vacations

2023-07-07:Codeforces 282E. Sausage Maximization
2023-07-06:Codeforces 730J. Bottles
2023-07-05:Codeforces 1157C2. Increasing Subsequence
2023-07-04:Codeforces 1051C. Vasya and Multisets
2023-07-03:Codeforces 1215B. The Number of Products