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

Luke is a Foodie

brute force, greedy, implementation

Good Key, Bad Key

bitmasks, brute force, dp, greedy, math

Double Strings

brute force, data structures, strings

Cypher

brute force, implementation, strings

YES or YES?

brute force, implementation, strings

Text Editor

brute force, dp, greedy, strings

Serega the Pirate

brute force, constructive algorithms

PermutationForces II

brute force, combinatorics, greedy, sortings, trees, two pointers

3SUM Closure

brute force, data structures

XOR Mixup

bitmasks, brute force

Coloring

brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math

Maximum Product?

brute force, combinatorics, dp, greedy, implementation, math, two pointers

Fishingprince Plays With Array Again

brute force, data structures, geometry, math

Tree Recovery

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

Tree Queries (Easy Version)

brute force, constructive algorithms, dfs and similar, dp, greedy, trees

Zero Path

brute force, data structures, dp, graphs, greedy, shortest paths

Decinc Dividing

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

3SUM

brute force, math

The Clock

brute force, implementation

Sum of Substrings

brute force, constructive algorithms, greedy, math, strings

Beat The Odds

brute force, greedy, math

ANDfinity

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

Lex String

brute force, greedy, implementation, sortings, two pointers

Cirno's Perfect Bitmasks Classroom

bitmasks, brute force

Cute number

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

Sanae and Giant Robot

binary search, brute force, data structures, dsu, greedy, sortings

The Enchanted Forest

brute force, greedy