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    PID远端题目
    CF1616ECF1616E Lexicographically Small Enough
    CF1616GCF1616G Just Add an Edge
    CF1620CCF1620C BA-String
    CF1620DCF1620D Exact Change
    CF1620ECF1620E Replace the Numbers
    CF1621HCF1621H Trains and Airplanes
    CF1625E1CF1625E1 Cats on the Upgrade (easy version)
    CF1625E2CF1625E2 Cats on the Upgrade (hard version)
    CF1627DCF1627D Not Adding
    CF1627ECF1627E Not Escaping
    CF1628D1CF1628D1 Game on Sum (Easy Version)
    CF1628D2CF1628D2 Game on Sum (Hard Version)
    CF1630FCF1630F Making It Bipartite
    CF1633DCF1633D Make Them Equal
    CF1633ECF1633E Spanning Tree Queries
    CF1635ECF1635E Cars
    CF1637DCF1637D Yet Another Minimization Problem
    CF1637ECF1637E Best Pair
    CF1637FCF1637F Towers
    CF1637GCF1637G Birthday
    CF1637HCF1637H Minimize Inversions Number
    CF1638ECF1638E Colorful Operations
    CF1638FCF1638F Two Posters
    CF163ECF163E e-Government
    CF1641DCF1641D Two Arrays
    CF1646DCF1646D Weight the Tree
    CF1654GCF1654G Snowy Mountain
    CF1658ECF1658E Gojou and Matrix Game
    CF1659FCF1659F Tree and Permutation Game
    CF165ECF165E Compatible Numbers
    CF1661CCF1661C Water the Trees
    CF1661DCF1661D Progressions Covering
    CF1662ECF1662E Round Table
    CF1662JCF1662J Training Camp
    CF1665ECF1665E MinimizOR
    CF1671ECF1671E Preorder
    CF1671FCF1671F Permutation Counting
    CF1675GCF1675G Sorting Pancakes
    CF1679FCF1679F Formalism for Formalism
    CF167ECF167E Wizards and Bets
    CF1680DCF1680D Dog Walking
    CF1680ECF1680E Moving Chips
    CF1681ECF1681E Labyrinth Adventures
    CF1682FCF1682F MCMF?
    CF1684DCF1684D Traps
    CF1685D2CF1685D2 Permutation Weight (Hard Version)
    CF1687ECF1687E Become Big For Me
    CF1687FCF1687F Koishi's Unconscious Permutation
    CF1689CCF1689C Infected Tree
    CF1691FCF1691F K-Set Tree
    CF16ECF16E Fish
    CF1701ECF1701E Text Editor
    CF1702G1CF1702G1 Passable Paths (easy version)
    CF1702G2CF1702G2 Passable Paths (hard version)
    CF1703GCF1703G Good Key, Bad Key
    CF1704DCF1704D Magical Array
    CF1705FCF1705F Mark and the Online Exam
    CF1707CCF1707C DFS Trees
    CF1707DCF1707D Partial Virtual Trees
    CF1707ECF1707E Replace
    CF1709CCF1709C Recover an RBS
    CF1709DCF1709D Rorororobot
    CF1709FCF1709F Multiset of Strings
    CF1710CCF1710C XOR Triangle
    CF1710ECF1710E Two Arrays
    CF1714GCF1714G Path Prefixes
    CF1715ECF1715E Long Way Home
    CF1716FCF1716F Bags with Balls
    CF1720D2CF1720D2 Xor-Subsequence (hard version)
    CF1721ECF1721E Prefix Function Queries
    CF1728DCF1728D Letter Picking
    CF1728ECF1728E Red-Black Pepper
    CF1732ECF1732E Location
    CF1737ECF1737E Ela Goes Hiking
    CF1739DCF1739D Reset K Edges
    CF173BCF173B Chamber of Secrets
    CF173ECF173E Camping Groups
    CF1741GCF1741G Kirill and Company
    CF1744E2CF1744E2 Divisible Numbers (hard version)
    CF1744FCF1744F MEX vs MED
    CF1748ECF1748E Yet Another Array Counting Problem
    CF1758FCF1758F Decent Division
    CF1762DCF1762D GCD Queries
    CF1762FCF1762F Good Pairs
    CF1762GCF1762G Unequal Adjacent Elements
    CF1763DCF1763D Valid Bitonic Permutations
    CF1764DCF1764D Doremy's Pegging Game
    CF1768FCF1768F Wonderful Jump
    CF176ECF176E Archaeology
    CF1770CCF1770C Koxia and Number Theory
    CF1770HCF1770H Koxia, Mahiru and Winter Festival
    CF1771DCF1771D Hossam and (sub-)palindromic tree
    CF1774HCF1774H Maximum Permutation
    CF1776DCF1776D Teamwork
    CF1781DCF1781D Many Perfect Squares
    CF1787CCF1787C Remove the Bracket
    CF1787HCF1787H Codeforces Scoreboard
    CF1791G2CF1791G2 Teleporters (Hard Version)
    CF1792DCF1792D Fixed Prefix Permutations
    CF1792ECF1792E Divisors and Table
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