Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Tree Queries

brute force, dp, trees

Armor and Weapons

brute force, dp, greedy, shortest paths

Mex Tree

brute force, dp, trees

AquaMoon and Permutations

2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs

Misha and Apples

brute force, data structures, dp, two pointers

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

Assiut Chess

brute force, constructive algorithms, interactive

Prince's Problem

brute force, data structures, math, number theory, trees

x-prime Substrings

brute force, dfs and similar, dp, string suffix structures, strings

Decinc Dividing

brute force, data structures, divide and conquer, dp, greedy

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

Lucky Interval

brute force, math

Entertaining Geodetics

brute force, dsu, implementation

Tennis Rackets

brute force, geometry

Long sequence

brute force, math, matrices

Divide The Students

brute force

Party

bitmasks, brute force, graph matchings

Robot in Basement

bitmasks, brute force, implementation

Concise and clear

brute force, greedy, implementation, math

Permutation Counting

brute force, combinatorics, dp, fft, math

Roland and Rose

brute force, geometry, math, sortings

Shortest path

brute force, geometry, math, shortest paths

Sources and Sinks

bitmasks, brute force, dfs and similar

Lucky Tickets

brute force, constructive algorithms

Most Different Tree

brute force, constructive algorithms, dfs and similar, greedy, hashing

Illumination

binary search, bitmasks, brute force, combinatorics, dp, math, two pointers

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Communication Towers

brute force, divide and conquer, dsu

Ever-Hungry Krakozyabra

brute force, combinatorics, greedy, math

Nene vs. Monsters (Hard Version)

brute force, greedy, implementation, math

Farmer John's Favorite Function

brute force, data structures, implementation, math

Serval and Brain Power

bitmasks, brute force, dp, greedy, implementation, strings

Matrix Rank (Easy Version)

brute force, combinatorics, dp, math, matrices

Maximize the Difference

bitmasks, brute force, dfs and similar

Binary Cards

brute force

Magician and Pigs (Hard Version)

binary search, brute force, data structures, implementation

Chiori and Doll Picking (easy version)

bitmasks, brute force, combinatorics, math

Swedish Heroes

brute force, dp, implementation

Chips on a Board

bitmasks, brute force, data structures, dp, games, two pointers

Juju and Binary String

brute force, constructive algorithms, greedy, math

Halve or Subtract

binary search, brute force, dp, greedy, sortings

Distinct Paths

brute force, combinatorics

Mother of Dragons

brute force, graphs, math, meet-in-the-middle

Common Divisor Graph

brute force, constructive algorithms, dsu, graphs, hashing, math, number theory

Two Arrays

bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Rogue-like Game

*special problem, brute force, greedy, two pointers

The very same Munchhausen

brute force

Frames

brute force

Power Defence

brute force, dp, geometry, greedy

Bob's Beautiful Array

bitmasks, brute force, greedy

The Last Hole!

brute force, geometry

Brand New Problem

bitmasks, brute force, dp

Dasha and Photos

brute force, data structures, dp, implementation

Candies for Children

brute force, math

Field Should Not Be Empty

brute force, data structures, divide and conquer

GCD is Greater

brute force, data structures, math, number theory

Scissors

brute force, strings

Kay and Eternity

brute force, implementation, sortings

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Sum of Matchings

brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math

Limak and Shooting Points

brute force, geometry, math

Cutting Rectangle

brute force, math, number theory

Too Much Money

brute force, greedy

Timofey and remoduling

brute force, implementation, math, number theory

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings

Vova Escapes the Matrix

brute force, dfs and similar, divide and conquer, shortest paths

Min Cost Permutation (Easy Version)

brute force, constructive algorithms, greedy, math

Vika and Stone Skipping

brute force, implementation, math, number theory

Matrix Sorting

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

Playoff Restoration

bitmasks, brute force, hashing, implementation, meet-in-the-middle

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Wise Men (Easy Version)

bitmasks, brute force, dp, meet-in-the-middle

Serega the Pirate

brute force, constructive algorithms

Tree Recovery

brute force, constructive algorithms, dfs and similar, dsu, graphs, trees

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Bring Balance

brute force, constructive algorithms, greedy

Twin Clusters

bitmasks, brute force, constructive algorithms, math, probabilities

Mathematics Curriculum

brute force, combinatorics, dp, trees

Palindrome Partition

binary search, brute force, data structures, dp, hashing, strings

Rebrending

brute force, data structures, divide and conquer, implementation

Ehab's REAL Number Theory Problem

brute force, dfs and similar, graphs, number theory, shortest paths

Lizards and Basements 2

brute force, dp

Binary Table

bitmasks, brute force, divide and conquer, dp, fft, math

Machine Learning

brute force, data structures

Lift and Throw

brute force

Two Circles

brute force, data structures, implementation

Interactive Bulls and Cows (Hard)

brute force, constructive algorithms, interactive

Cycle

brute force, dfs and similar, implementation

Shaass and Painter Robot

brute force, implementation, number theory

Digits

brute force, implementation, math

Rhombus

brute force, data structures, dp

Savior

brute force, dsu, math

Dividing Kingdom

binary search, brute force, data structures

Azembler

brute force, implementation

Igor and Interesting Numbers

brute force, combinatorics, dp, math

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Interactive Factorial Guessing

brute force, games, implementation, interactive