Necromancer

*special problem

Equal Trees

*special problem, graphs, meet-in-the-middle

Composite Spells

*special problem, dp

Observation Towers

*special problem

Narrow Paths

*special problem, combinatorics

Yet Another Permutation Constructive

*special problem, constructive algorithms

Staircase

*special problem

Firewood

*special problem

Clock in the Pool

*special problem, math

1-3-5

*special problem, dp

Almost Certainly

*special problem, constructive algorithms, data structures, sortings

Burenka and Pether

*special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees

Three Arrays

*special problem, constructive algorithms, implementation, sortings

Parallel Universes

*special problem, constructive algorithms, dfs and similar, dsu, graphs

Big Persimmon

*special problem, dp, games

More Gifts

*special problem, dfs and similar, two pointers

Evidence Board

*special problem, constructive algorithms, dfs and similar, graphs, trees

Draw Polygon Lines

*special problem, constructive algorithms, dp, geometry, interactive

Two Colors

*special problem

Inverse Problem

*special problem, combinatorics, dp

Sum of Digits of Sums

*special problem, binary search, data structures

Pool Records

*special problem, greedy

Build Railway Stations

*special problem, greedy, trees

Maximum Sum Subarrays

*special problem, dp

Remove and Add

*special problem, greedy

Poisonous Swamp

*special problem, *special problem, implementation, implementation

Security Guard

*special problem, greedy

Username

*special problem, implementation

Deterministic Scheduling for Extended Reality over 5G and Beyond

*special problem

Unmysterious Language

*special problem, constructive algorithms, strings

Mountain Climber

*special problem

Expected Twist

*special problem, interactive

Colour Vision

*special problem, implementation

Factorization

*special problem, number theory

Not a Geometry Problem

*special problem, *special problem, constructive algorithms, geometry, math

Trivial Conjecture

*special problem, constructive algorithms, math, number theory

Digits

*special problem

Was it Rated?

*special problem, *special problem, *special problem, brute force, implementation

Are You a Robot?

*special problem, *special problem, *special problem, expression parsing, strings

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 II

*special problem, 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

Узкая дорога

*special problem, math

Cross-Language Program

*special problem, constructive algorithms

Six Characters

*special problem, constructive algorithms, strings

In Every Generation...

*special problem, strings

Are You Safe?

*special problem, implementation

Is it rated - 3

*special problem, combinatorics, dp, math

Pōja Verdon

*special problem, implementation, math

Mike's Sequence

*special problem, divide and conquer, implementation, math

Who Tested?

*special problem, expression parsing, trees

Communication Routing Challenge

*special problem

Two Railroads

*special problem

Physical Examination

*special problem, binary search, data structures

Laser Beams

*special problem, geometry, probabilities

A Battle Against a Dragon

*special problem, data structures, dp

Kotlinforces

*special problem, constructive algorithms, dp

Fix the String

*special problem, bitmasks, dp, greedy

Sweepstake

*special problem, brute force, constructive algorithms, implementation, math

Rhyme

*special problem, implementation

Epic Novel

*special problem, math

Sequence of Comparisons

*special problem

Pawns

*special problem

Excursions

*special problem, constructive algorithms, dfs and similar, flows, graph matchings, graphs

Submatrices

*special problem, bitmasks, data structures, dp

Biome Map

*special problem, constructive algorithms, dfs and similar, graphs

Binary String Partition

*special problem, binary search, greedy

Chess Team Forming

*special problem, binary search, data structures, greedy

String Searching

*special problem, hashing

Sweets

*special problem, data structures, implementation

Nearest Point Function

*special problem, implementation

Travel to Bertown

*special problem, implementation, math

Prefixes and Suffixes

*special problem, strings

Good Array

*special problem

Teams Forming

*special problem, sortings

Uniform String

*special problem, implementation

Frog Jumping

*special problem, math

A+B (Trial Problem)

*special problem

Сортировка слиянием

*special problem, binary search

Сортировка слиянием

*special problem, *special problem, brute force

Сортировка слиянием

*special problem

Редактируем Зингер | color

*special problem, *special problem

Симметричный амфитеатр

*special problem, constructive algorithms, dp

Мониторинг

*special problem

Мониторинг

*special problem, *special problem

Зингер | color

*special problem, implementation

Mysterious language again, seriously?

*special problem

L BREAK into program

*special problem

Encoded message

*special problem, implementation

Math

*special problem, math

Cakewalk

*special problem, greedy, implementation, shortest paths

Xenolith? Hippodrome?

*special problem, number theory

Fibonacci Words

*special problem, implementation

DMCA

*special problem, implementation, number theory

Is it rated - 2

*special problem, implementation, interactive

Flower Shop

*special problem, data structures, fft, math