Pouring Rain

geometry, math

Coloring Trees

dp

Vlad and Cafes

Eugeny and Play List

binary search, implementation, two pointers

Peaceful Rooks

dfs and similar, dsu, graphs

Increasing Subsequence (hard version)

greedy

Candy Store

greedy, math, number theory

Amr and The Large Array

implementation

24 Game

constructive algorithms, greedy, math

XOR and Favorite Number

data structures

Weakened Common Divisor

brute force, greedy, number theory

Radio Towers

combinatorics, dp, math

Make a Square

brute force, implementation, math

Replace the Numbers

constructive algorithms, data structures, dsu, implementation

Magic Spheres

implementation

Party Lemonade

bitmasks, dp, greedy

Petr and a calendar

implementation, math

Save the Nature

binary search, greedy

Dividing Orange

implementation

Set of Strings

implementation, strings

Ksusha and Array

brute force, number theory, sortings

Array Painting

constructive algorithms, greedy, two pointers

Pekora and Trampoline

brute force, data structures, dp, greedy, implementation

Permutation

constructive algorithms, dp, math

Spotlights

dp, implementation

Correct Placement

binary search, data structures, dp, sortings, two pointers

Polycarp's New Job

implementation

New Year and Permutation

combinatorics, math

Little Robber Girl's Zoo

constructive algorithms, implementation, sortings

Two Cakes

greedy

Orac and Medians

constructive algorithms, greedy, math

Network Topology

graphs, implementation

Seating Arrangements (hard version)

data structures, greedy, implementation, sortings, two pointers

Kvass and the Fair Nut

greedy, implementation

Easy Problem

dp

Lucky Permutation Triple

constructive algorithms, implementation, math

Quiz Master

binary search, math, number theory, sortings, two pointers

Knowledge Cards

constructive algorithms, data structures

Writing Code

dp

Submarine in the Rybinsk Sea (easy edition)

combinatorics, math, number theory

Sasha and Magnetic Machines

greedy, number theory

Ant colony

data structures, math, number theory

Browser

implementation

Make It Equal

greedy

Polycarp and String Transformation

binary search, implementation, sortings, strings

Star sky

dp, implementation

Flexible String

bitmasks, brute force, strings

Chess Tourney

implementation, sortings

Booking System

binary search, dp, greedy, implementation

Position in Fraction

math, number theory

Nastya Is Transposing Matrices

constructive algorithms, sortings

Declined Finalists

greedy, implementation

Dima and Continuous Line

brute force, implementation

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Xenia and Tree

data structures, divide and conquer, trees

Berry Jam

data structures, dp, greedy, implementation

Wilbur and Swimming Pool

geometry, implementation

Almost Identity Permutations

combinatorics, dp, math

Water The Garden

implementation

Students in Railway Carriage

constructive algorithms, greedy, implementation

Bakry and Partitioning

bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees

Alyona and mex

constructive algorithms, greedy

The Modcrab

greedy, implementation

New Year and Buggy Bot

brute force, implementation

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

Win or Freeze

games, math, number theory

Division and Union

sortings

Removing Columns

brute force, constructive algorithms, implementation

Towers

brute force, constructive algorithms, greedy, implementation, sortings

Two Platforms

binary search, dp, sortings, two pointers

Kayaking

brute force, greedy, sortings

Alternative Thinking

dp, greedy, math

Ntarsis' Set

binary search, math, number theory

GCD Table

constructive algorithms, greedy, number theory

Reverse Madness

data structures, greedy

Binary Protocol

implementation

Vanya and Food Processor

implementation, math

Catching Cheaters

dp, strings

Palindrome Game (hard version)

constructive algorithms, games

Jellyfish and Mex

dp

The Fair Nut and String

combinatorics, dp, implementation

One Bomb

implementation

Coins and Queries

greedy

Replace To Make Regular Bracket Sequence

data structures, expression parsing, math

Character Blocking

data structures, hashing, implementation

Prizes, Prizes, more Prizes

implementation

Maximum Subsequence Value

brute force, constructive algorithms

USB vs. PS/2

greedy, implementation, sortings, two pointers

Playoff Tournament

data structures, dfs and similar, dp, implementation, trees

Boris and His Amazing Haircut

constructive algorithms, data structures, dp, dsu, greedy, sortings

And

greedy

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Effects of Anti Pimples

combinatorics, number theory, sortings

Equations of Mathematical Magic

math

RPD and Rap Sheet (Easy Version)

bitmasks, constructive algorithms, interactive, math

Sonya and Robots

constructive algorithms, implementation

Replacement

greedy, implementation, sortings

Christmas Trees

graphs, greedy, shortest paths

The Wall

math

The Football Season

brute force, math, number theory