Matches Are Not a Child's Play

data structures, trees

Train Car Selection

data structures, greedy

Cooperative Game

constructive algorithms, interactive, number theory

Museums Tour

dp, graphs, implementation

Greedy Subsequences

data structures, dp, trees

Most Dangerous Shark

data structures, dp, two pointers

Legendary Tree

binary search, interactive, trees

Isolation

data structures, dp

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Secret Letters

data structures, dp, greedy

The very same Munchhausen

brute force

Power Tree

dfs and similar, dp, dsu, graphs, greedy, trees

Once in a casino

constructive algorithms, greedy, implementation, math

Triple

fft, math

Get Ready for the Battle

constructive algorithms, implementation

Niyaz and Small Degrees

data structures, dp, trees

Tree Cutting (Hard Version)

combinatorics, dfs and similar, dp, trees

Recursive Queries

data structures

Crisp String

bitmasks, dp

Please, another Queries on Array?

bitmasks, data structures, divide and conquer, math, number theory

Tree

data structures, dfs and similar, dp, graphs, trees

Destroy the Colony

combinatorics, dp, math

Modest Substrings

dp, strings

Tree-Tac-Toe

constructive algorithms, games, trees

Nearest Leaf

data structures, trees

Sasha and Algorithm of Silence's Sounds

data structures, trees

Sasha and a Very Easy Test

data structures, number theory

Sasha and Interesting Fact from Graph Theory

brute force, combinatorics, dp, math, trees

Sasha and a Patient Friend

binary search, data structures, implementation

Vasya and Maximum Profit

binary search, constructive algorithms, data structures, dp, dsu

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Vasya and Binary String

dp

Lunar New Year and a Recursive Sequence

math, matrices, number theory

Radix sum

fft, math, number theory

Professional layer

bitmasks, dp

Johnny Solving

constructive algorithms, dfs and similar, graphs, math

Trucks and Cities

binary search, dp

Ivan and Burgers

data structures, divide and conquer, greedy, math

Dasha and Chess

constructive algorithms, games, interactive

Cookies

binary search, data structures, dfs and similar, dp, games, trees

Ж-function

string suffix structures, strings

Fedya the Potter

binary search, implementation, math, number theory

Eels

data structures

Construct a tree

binary search, constructive algorithms, dfs and similar, graphs, greedy, trees

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Vladislav and a Great Legend

combinatorics, dp, trees

Alex and a TV Show

bitmasks, combinatorics, number theory

Egor and an RPG game

constructive algorithms, greedy

Lucky Tickets

divide and conquer, dp, fft

The Top Scorer

combinatorics, dp, math, probabilities

Vasya and Array

dp

Intersection of Permutations

data structures

New Year and the Tricolore Recreation

games

New Year and the Factorisation Collaboration

interactive, math, number theory

New Year and the Mallard Expedition

constructive algorithms, greedy

New Year and the Acquaintance Estimation

binary search, data structures, graphs, greedy, implementation, math, sortings

Two Prefixes

strings

Linearization

graphs

Combostone

games, implementation

How to Learn You Score

constructive algorithms, interactive

New Year Presents

constructive algorithms, data structures

Minegraphed

constructive algorithms, graphs

King Kog's Reception

data structures

JS Minification

greedy, implementation

Interval-Free Permutations

combinatorics

Harder Satisfiability

2-sat, dfs and similar, graphs

Distance Sum

graphs

Cactus Search

interactive

Bimatching

graphs

Ehab and a weird weight formula

data structures, trees

Ehab and a component choosing problem

dp, greedy, math, trees

Forest Fires

math

Beautiful Matrix

combinatorics, data structures, dp

Rock-Paper-Scissors Champion

The Fair Nut and Amusing Xor

data structures

The Fair Nut and Rectangles

data structures, dp, geometry

The Fair Nut's getting crazy

data structures, implementation

Max Mex

data structures, trees

Petya and Graph

flows, graphs

Speed Dial

dp, strings, trees

Palindromic Magic

data structures, hashing, strings

Mergesort Strikes Back

math, probabilities

Tricky Interactor

constructive algorithms, implementation, interactive

Katya and Segments Sets

data structures, interactive, sortings

Sonya and Matrix Beauty

strings

Negative Time Summation

constructive algorithms

Array Game

data structures, games

Summer Practice Report

dp, greedy

Yet Another LCP Problem

data structures, string suffix structures

Choosing Two Paths

dfs and similar, dp, greedy, trees

Rain Protection

binary search, geometry

Algoland and Berland

constructive algorithms, divide and conquer, geometry

Odd Federalization

constructive algorithms

Privatization of Roads in Berland

flows, graph matchings, graphs

Berkomnadzor

data structures, greedy

Random Forest Rank

dp, graph matchings, math, trees

Computer Game

dp, greedy, math, probabilities

Knights

constructive algorithms

Fibonacci Suffix

strings

Up and Down the Tree

dfs and similar, dp, trees