- 1700 1661C. Water the Trees
- 800 1676A. Lucky?
- 800 1676B. Equal Candies
- 800 1676C. Most Similar Words
- 1000 1676D. X-Sum
- 1100 1676E. Eating Queries
- 1300 1676F. Longest Strike
- 1300 1676G. White-Black Balanced Subtrees
- 1400 1676H1. Maximum Crossings (Easy Version)
- 1500 1676H2. Maximum Crossings (Hard Version)
- 900 1679A. AvtoBus
- 1200 1679B. Stone Age Problem
- 1400 1679C. Rooks Defenders
- 800 1680A. Minimums and Maximums
- 800 1680B. Robots
- 1600 1680C. Binary String
- 2000 1680E. Moving Chips
- 800 1681A. Game with Cards
- 800 1681B. Card Trick
- 1200 1681C. Double Sort
- 800 1682A. Palindromic Indices
- 1100 1682B. AND Sorting
- 800 1684A. Digit Minimization
- 800 1684B. Z mod X = C
- 1700 1684D. Traps
- 1600 1687A. The Enchanted Forest
- 800 1688A. Cirno's Perfect Bitmasks Classroom
- 800 1688B. Patchouli's Magical Talisman
- 1700 1688C. Manipulating History
- 800 1689A. Lex String
- 900 1689B. Mystic Permutation
- 1600 1689C. Infected Tree
- 800 1690A. Print a Pedestal (Codeforces logo?)
- 800 1690B. Array Decrements
- 800 1690C. Restoring the Duration of Tasks
- 1000 1690D. Black and White Stripe
- 1500 1690E. Price Maximization
- 1700 1690F. Shifting String
- 2000 1690G. Count the Trains
- 800 1691A. Beat The Odds
- 1000 1691B. Shoe Shuffling
- 1400 1691C. Sum of Substrings
- 800 1692A. Marathon
- 800 1692B. All Distinct
- 800 1692C. Where's the Bishop?
- 1100 1692D. The Clock
- 1200 1692E. Binary Deque
- 1300 1692F. 3SUM
- 1400 1692G. 2^Sort
- 1700 1692H. Gambling
- 1300 1693A. Directional Increase
- 800 1694A. Creep
- 1200 1694B. Paranoid String
- 800 1695A. Subrectangle Guess
- 1000 1695B. Circle Game
- 1700 1695C. Zero Path
- 800 1697A. Parkway Walk
- 900 1697B. Promo
- 1400 1697C. awoo's Favorite Problem
- 800 1698A. XOR Mixup
- 800 1698B. Rising Sand
- 1300 1698C. 3SUM Closure
- 1600 1698D. Fixed Point Guessing
- 800 1699A. The Third Three Number Problem
- 900 1699B. Almost Ternary Matrix
- 1700 1699C. The Third Problem
- 800 1700A. Optimal Path
- 1100 1700B. Palindromic Numbers
- 1700 1700C. Helping the Nature
- 800 1701A. Grass Field
- 800 1701B. Permutation
- 1400 1701C. Schedule Management
- 800 1705A. Mark the Photographer
- 900 1705B. Mark the Dust Sweeper
- 1400 1705C. Mark and His Unfinished Essay
- 1800 1705D. Mark and Lightbulbs
- 1600 1707A. Doremy's IQ
- 800 1708A. Difference Operations
- 1100 1708B. Difference of GCDs
- 800 1709A. Three Doors
- 900 1709B. Also Try Minecraft
- 1800 1709C. Recover an RBS
- 800 1712A. Wonderful Permutation
- 800 1712B. Woeful Permutation
- 1100 1712C. Sort Zero
- 900 1714A. Everyone Loves to Sleep
- 800 1714B. Remove Prefix
- 800 1714C. Minimum Varied Number
- 1600 1714D. Color with Occurrences
- 1400 1714E. Add Modulo 10
- 1700 1715C. Monoblock
- 800 1717A. Madoka and Strange Thoughts
- 800 1719A. Chip Game
- 800 1719B. Mathematical Circus
- 1400 1719C. Fighting Tournament
- 900 1720A. Burenka Plays with Fractions
- 800 1720B. Interesting Sum
- 1200 1720C. Corners
- 1800 1720D1. Xor-Subsequence (easy version)
- 1500 1722G. Even-Odd XOR
- 800 1730A. Planets
- 1600 1730B. Meeting on the Line
- 1200 1730C. Minimum Notation
- 800 1735A. Working Week
- 900 1735B. Tea with Tangerines
- 1400 1735C. Phase Shift
- 800 1736A. Make A Equal to B
- 1200 1736B. Playing with GCD
- 1300 1736C1. Good Subarrays (Easy Version)
- 800 1741A. Compare T-Shirt Sizes
- 800 1741B. Funny Permutation
- 1100 1741C. Minimize the Thickness
- 1300 1741D. Masha and a Beautiful Tree
- 1600 1741E. Sending a Sequence Over the Network
- 1500 1742G. Orray
- 800 1743A. Password
- 800 1743B. Permutation Value
- 1100 1743C. Save the Magazines
- 1700 1743D. Problem with Random Tests
- 1600 1748C. Zero-Sum Prefixes
- 1600 1753B. Factorial Divisibility