Block unitary

*special problem

HQ

*special problem, constructive algorithms

Factorial zeros

*special problem

Chessboard

*special problem

Double Permutation Inc.

*special problem, binary search, greedy

Hammer throwing

*special problem

Игра в Девятку II

*special problem, brute force

Array Sorting

*special problem

Goshtasp, Vishtasp and Eidi

*special problem, greedy, math

Kotlinforces

*special problem, constructive algorithms, dp

Maximum Sum Subarrays

*special problem, dp

Domain

*special problem, expression parsing

Three Arrays

*special problem, constructive algorithms, implementation, sortings

HQ9+

*special problem

Perfectionist Arkadiy

*special problem, number theory

Dogecoin

*special problem, *special problem, binary search, data structures

Array sorting

*special problem, sortings

Build Railway Stations

*special problem, greedy, trees

Neural Network Problem

*special problem, binary search, greedy

Binary notation

*special problem

Ali goes shopping

*special problem, brute force, strings

Levenshtein distance

*special problem

Caesar Cipher

*special problem

Narrow Paths

*special problem, combinatorics

Reformat the String

*special problem

Number Deletion Game

*special problem, dp, games, greedy

Expected Twist

*special problem, interactive

Quantum Classification - 1

*special problem

Polynom

*special problem, implementation

Two IP Cameras

*special problem, math, number theory

Контрольная сумма

*special problem

The Fraction

*special problem

Array Sum

*special problem

Greedy Petya

*special problem, dfs and similar, graphs, greedy

Viruses

*special problem, dp, shortest paths, string suffix structures

Maximal Difference

*special problem

Almost Certainly

*special problem, constructive algorithms, data structures, sortings

Quantum Classification - 2

*special problem

Counting Fridays

*special problem

Triskaidekaphobia

*special problem

Points in triangle

*special problem, geometry

Painting Numbers

*special problem, data structures, greedy, number theory

Mixture

*special problem, data structures, geometry, math, sortings

kotlinkotlinkotlinkotlin...

*special problem, graphs, implementation, strings

Feed the Golorp

*special problem

Oil

*special problem, greedy, math

Path Canonization

*special problem

Игра в Девятку III

*special problem, brute force

Wheels

*special problem, binary search, greedy

Movie Fan

*special problem, data structures, greedy, implementation, sortings

Name the album

*special problem, data structures, implementation

Table Bowling

*special problem, sortings

Roads

*special problem, geometry, sortings

Pens And Days Of Week

*special problem, binary search, number theory

Composing Of String

*special problem, dp

Jumping frogs

*special problem

Pairwise Sums

*special problem

Exchange of Books

*special problem

Шардирование постов

*special problem, binary search, interactive

Hamming Distance

*special problem

Brackets

*special problem

Observation Towers

*special problem

Biome Map

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

Sort the Table

*special problem, sortings

Parallel Universes

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

Sum of Digits of Sums

*special problem, binary search, data structures

Submatrices

*special problem, bitmasks, data structures, dp

Date Change

*special problem

Divisibility Check

*special problem

Chain Letter

*special problem, dfs and similar, graphs

INI-file

*special problem, implementation

Battleship

*special problem, dfs and similar, implementation

Euclidean Distance

*special problem

Truncatable primes

*special problem

Perse-script

*special problem, expression parsing

A Battle Against a Dragon

*special problem, data structures, dp

Graph Decomposition

*special problem, graphs

King's Path

*special problem, math, trees

Rogue-like Game

*special problem, brute force, greedy, two pointers

M-numbers

*special problem, dp, math

Rotate Matrix

*special problem

Composite Spells

*special problem, dp

Interval Coloring

*special problem, greedy, math

Big Persimmon

*special problem, dp, games

Building Skyscrapers

*special problem

Контрольная сумма

*special problem

Non-decimal sum

*special problem

Physical Examination

*special problem, binary search, data structures

Build From Suffixes

*special problem, combinatorics, data structures

Suffix Subgroup

*special problem, strings

Pool Records

*special problem, greedy

Hungarian Notation

*special problem

Excursions

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

Game with Segments

*special problem, data structures, games

Laser Beams

*special problem, geometry, probabilities

Superstitions Inspection

*special problem

Black Cat Rush

*special problem

Two Colors

*special problem

Zero-XOR Array

*special problem, dp

Cyclic Shifts

*special problem, strings