Palindrome Game (hard version)

constructive algorithms, games

Maximum Subsequence Value

brute force, constructive algorithms

Nastya Is Transposing Matrices

constructive algorithms, sortings

Boris and His Amazing Haircut

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

Sonya and Robots

constructive algorithms, implementation

RPD and Rap Sheet (Easy Version)

bitmasks, constructive algorithms, interactive, math

Same Count One

brute force, constructive algorithms, greedy, implementation, two pointers

A/B Matrix

constructive algorithms, greedy, math

Tennis Championship

combinatorics, constructive algorithms, greedy, math

Restoring Painting

brute force, constructive algorithms, math

Print Check

constructive algorithms, implementation

Insert a Progression

brute force, constructive algorithms, greedy

Heap Operations

constructive algorithms, data structures, greedy

Paint the Digits

constructive algorithms, greedy, implementation

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

Li Hua and Chess

constructive algorithms, greedy, interactive

New Year Present

constructive algorithms, implementation

Sequence Master

brute force, constructive algorithms, math

Prime Graph

constructive algorithms, greedy, math, number theory

Pasha and Tea

constructive algorithms, implementation, math, sortings

String Coloring (easy version)

constructive algorithms, dp, graphs, greedy, sortings

The Number of Imposters

constructive algorithms, dfs and similar, dp, dsu, graphs

Vika and Squares

constructive algorithms, implementation

Sorting Railway Cars

constructive algorithms, greedy

World Cup

constructive algorithms, implementation

Equal Frequencies

brute force, constructive algorithms, greedy, implementation, sortings, strings

Umka and a Long Flight

constructive algorithms, implementation, math

Minimum Euler Cycle

constructive algorithms, graphs, greedy, implementation

Sequence Transformation

constructive algorithms, math

Primitive Primes

constructive algorithms, math, ternary search

A Tide of Riverscape

constructive algorithms, strings

Three Garlands

brute force, constructive algorithms

Messenger in MAC

binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings

Matrix and Shifts

brute force, constructive algorithms, greedy, implementation

Increasing Subsequences

bitmasks, constructive algorithms, divide and conquer, greedy, math

Singers' Tour

constructive algorithms, math

Guess the Array

constructive algorithms, interactive, math

Zookeeper and The Infinite Zoo

bitmasks, constructive algorithms, dp, greedy, math

3-Coloring

constructive algorithms, games, interactive

Kalevitch and Chess

brute force, constructive algorithms

Domino (easy version)

constructive algorithms, math

Range = √Sum

binary search, brute force, constructive algorithms, math, two pointers

Cards with Numbers

constructive algorithms, sortings

Letter Picking

constructive algorithms, dp, games, two pointers

Smallest Word

constructive algorithms, greedy, implementation

Directing Edges

constructive algorithms, dfs and similar, graphs

The Party and Sweets

binary search, constructive algorithms, greedy, implementation, math, sortings, two pointers

Painting the Array I

constructive algorithms, data structures, dp, greedy, implementation

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Bicolored RBS

constructive algorithms, greedy

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Doremy's Connecting Plan

constructive algorithms, greedy, math, sortings

Chopping Carrots (Easy Version)

binary search, brute force, constructive algorithms, greedy, number theory

K-special Tables

constructive algorithms, implementation

Dual (Hard Version)

constructive algorithms, math

Bear and Different Names

constructive algorithms, greedy

Binary Search

binary search, constructive algorithms, greedy

Tree Requests

binary search, bitmasks, constructive algorithms, dfs and similar, graphs, trees

Ira and Flamenco

combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers

K-good

constructive algorithms, math, number theory

Ramesses and Corner Inversion

constructive algorithms, greedy, implementation, math

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

A Trivial Problem

brute force, constructive algorithms, math, number theory

Cards

constructive algorithms, dp, math

Cows and Sequence

constructive algorithms, data structures, implementation

Take a Guess

bitmasks, constructive algorithms, interactive, math

League of Leesins

constructive algorithms, implementation

Different Rules

constructive algorithms, greedy, implementation, math

Distances to Zero

constructive algorithms

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Bear and Forgotten Tree 3

constructive algorithms, graphs, trees

Candy Party (Easy Version)

bitmasks, constructive algorithms, graphs, greedy, implementation, math

Matrix Cascade

brute force, constructive algorithms, data structures, dp, greedy, math

Lexicographically Largest

binary search, constructive algorithms, data structures, greedy, sortings

Valera and Contest

constructive algorithms, implementation, math

Another Array Problem

brute force, constructive algorithms, greedy

Little Frog

constructive algorithms

Three Bags

constructive algorithms, greedy

Asya And Kittens

constructive algorithms, dsu

Segments

constructive algorithms, math

Qualifying Contest

constructive algorithms, sortings

Integral Array

brute force, constructive algorithms, data structures, math

Interesting Array

constructive algorithms, data structures, trees

Relatively Prime Graph

brute force, constructive algorithms, graphs, greedy, math

Breaking the Wall

binary search, brute force, constructive algorithms, greedy, math

Mark and Lightbulbs

combinatorics, constructive algorithms, greedy, math, sortings

Pashmak and Buses

combinatorics, constructive algorithms, math

Vasya And Array

constructive algorithms, greedy, implementation

Marina and Vasya

constructive algorithms, greedy, strings

Plate Game

constructive algorithms, games, math

Shortest and Longest LIS

constructive algorithms, graphs, greedy, two pointers

Aroma's Search

brute force, constructive algorithms, geometry, greedy, implementation

Binary Literature

constructive algorithms, greedy, implementation, strings, two pointers

Cyclic Rotation

constructive algorithms, greedy, implementation, two pointers

Tea Party

constructive algorithms, greedy, sortings

Genius's Gambit

bitmasks, constructive algorithms, greedy, math

Anya and Smartphone

constructive algorithms, data structures, implementation

Find a Mine

binary search, constructive algorithms, geometry, greedy, interactive, math