Graph Coloring (hard version)

brute force, combinatorics, divide and conquer, dp, fft, graphs

Divisors and Table

brute force, dfs and similar, dp, number theory

Min Max Sort

binary search, brute force, greedy, math, two pointers

Range Update Point Query

binary search, brute force, data structures

Distinct Split

brute force, greedy, strings

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Premutation

brute force, implementation, math

Colorful Tree Again

brute force, data structures, trees

Cake Assembly Line

brute force, sortings

Infinite Game

brute force, combinatorics, dp, games, probabilities

Game of the Year

brute force, data structures, math, number theory

Different Arrays

brute force, dp, implementation

Rectangle Shrinking

binary search, brute force, data structures, greedy, implementation, two pointers

Many Perfect Squares

brute force, math, number theory

Equal Frequencies

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

Going to the Cinema

brute force, greedy, sortings

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Josuke and Complete Graph

binary search, brute force, data structures, math, number theory

GCD Partition

brute force, greedy, math, number theory

Olympic Team Building

brute force, meet-in-the-middle

Flexible String

bitmasks, brute force, strings

Gardener and the Capybaras (easy version)

brute force, constructive algorithms, implementation

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Magician and Pigs (Hard Version)

binary search, brute force, data structures, implementation

Magician and Pigs (Easy Version)

brute force, data structures, implementation

Same Count One

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

Interactive Factorial Guessing

brute force, games, implementation, interactive

Matrix Rotation

brute force, implementation

Hossam and a Letter

brute force, dp, implementation, two pointers

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Koxia and Number Theory

brute force, chinese remainder theorem, math, number theory

Koxia and Whiteboards

brute force, greedy

Игра в Девятку III

*special problem, brute force

Игра в Девятку II

*special problem, brute force

Игра в Девятку I

*special problem, brute force, dp

Подкрутка I

*special problem, brute force, dp, greedy

Копирование файлов II

*special problem, binary search, brute force, math

Копирование файлов I

*special problem, brute force, implementation, math

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Decomposition

binary search, brute force, data structures, divide and conquer, dp, two pointers

Extremely Round

brute force, implementation

Project Manager

brute force, data structures, implementation

Exchange

brute force, math

Doremy's Experimental Tree

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

Another Array Problem

brute force, constructive algorithms, greedy

Incinerate

binary search, brute force, data structures, implementation, math, sortings

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

Two Permutations

brute force, constructive algorithms

The Humanoid

brute force, dp, sortings

Make It Round

brute force, number theory

Range = √Sum

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

Minecraft Series

brute force, two pointers

N Machines

binary search, brute force, greedy

Maximum Substring

brute force, greedy, implementation

Zero-Sum Prefixes

brute force, data structures, dp, greedy, implementation

Diverse Substrings

brute force, implementation, strings

Divisible Numbers (hard version)

brute force, math, number theory

Divisible Numbers (easy version)

brute force, math, number theory

Problem with Random Tests

brute force, dp, greedy, probabilities

Password

brute force, combinatorics, implementation, math

Orray

bitmasks, brute force, greedy, math, sortings

Coprime

brute force, greedy, number theory

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Minimize the Thickness

brute force, greedy, math, two pointers

Ela and the Wiring Wizard

brute force, dp, graphs, greedy, implementation, shortest paths

Make A Equal to B

brute force, greedy, sortings

Meta-set

brute force, combinatorics, data structures, hashing, math

Select Three Sticks

brute force, greedy, sortings

Balance (Hard version)

brute force, data structures, number theory

Balance (Easy version)

brute force, data structures, implementation, number theory

Sheikh (Hard Version)

binary search, bitmasks, brute force, greedy, implementation, two pointers

Ugu

brute force, dp, greedy, implementation

Bestie

brute force, combinatorics, constructive algorithms, implementation, math, number theory

Function Sum

brute force, combinatorics, dp, fft, math

Valiant's New Map

binary search, brute force, data structures, dp, two pointers

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Illumination

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

Red-Black Pepper

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

Colored Balls: Revisited

brute force, greedy, implementation, sortings

Edge Split

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

Counting Rectangles

brute force, data structures, dp, implementation

Matching Reduction

brute force, constructive algorithms, dfs and similar, flows, graph matchings, graphs, interactive

Xor-Subsequence (easy version)

bitmasks, brute force, dp, strings, trees, two pointers

Interesting Sum

brute force, data structures, greedy, math, sortings

Chip Move

brute force, dp, math

Add Modulo 10

brute force, math, number theory

Color with Occurrences

brute force, data structures, dp, greedy, strings

LCM Sum (hard version)

brute force, data structures, math, number theory, two pointers

LCM Sum (easy version)

binary search, brute force, combinatorics, math, number theory, two pointers

Party

brute force, graphs

XOR Triangle

bitmasks, brute force, constructive algorithms, dp, greedy, math

Rain

binary search, brute force, data structures, geometry, greedy, implementation, math

Multiset of Strings

bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees

Three Doors

brute force, greedy, implementation, math

Difference Array

brute force, data structures, implementation, sortings

Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

Chopping Carrots (Easy Version)

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

Mark and Professor Koro

binary search, bitmasks, brute force, combinatorics, data structures, greedy

Mark and His Unfinished Essay

brute force, implementation

Count Seconds

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