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

New Year and the Permutation Concatenation

combinatorics, dp, math

New Year and the Sphere Transmission

math, number theory

New Year and the Treasure Geolocation

brute force, constructive algorithms, greedy, implementation

New Year and the Christmas Ornament

brute force, implementation, math

The Pleasant Walk

implementation

Berland University

greedy, math

Right Expansion Of The Mind

math

Two Prefixes

strings

Minimal Product

Linearization

graphs

Combostone

games, implementation

How to Learn You Score

constructive algorithms, interactive

Horseback Riding

flows, graphs

Similar Arrays

constructive algorithms

New Year Presents

constructive algorithms, data structures

LaTeX Expert

Company Merging

greedy

Minegraphed

constructive algorithms, graphs

Lazyland

King Kog's Reception

data structures

JS Minification

greedy, implementation

Interval-Free Permutations

combinatorics

Harder Satisfiability

2-sat, dfs and similar, graphs

Guest Student

math

Fractions

math

Easy Chess

constructive algorithms

Distance Sum

graphs

Cactus Search

interactive

Bimatching

graphs

Alice the Fan

dp

Ehab and a weird weight formula

data structures, trees

Ehab and a component choosing problem

dp, greedy, math, trees

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Ehab and a 2-operation task

constructive algorithms, greedy, math

Ehab and subtraction

implementation, sortings

Ehab and another construction problem

brute force, constructive algorithms

Forest Fires

math

Beautiful Matrix

combinatorics, data structures, dp

Rock-Paper-Scissors Champion

Vasya and Templates

greedy, implementation, strings

Minimum Diameter Tree

constructive algorithms, implementation, trees

Connect Three

implementation, math

Div Times Mod

math

Right-Left Cipher

implementation, strings

The Fair Nut and String

combinatorics, dp, implementation

Kvass and the Fair Nut

greedy, implementation

The Fair Nut and Elevator

brute force, implementation

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

The Fair Nut and Strings

greedy, strings

The Fair Nut and the Best Path

data structures, dp, trees

Petya and Graph

flows, graphs

Speed Dial

dp, strings, trees

Increasing Frequency

binary search, dp, greedy

Maximum Diameter Graph

constructive algorithms, graphs, implementation

Multi-Subject Competition

greedy, sortings

Vova and Trophies

greedy

Vasya and Book

implementation, math

Palindromic Magic

data structures, hashing, strings

Mergesort Strikes Back

math, probabilities

Tricky Interactor

constructive algorithms, implementation, interactive

Missing Numbers

binary search, constructive algorithms, greedy, math, number theory

Maximum Distance

dsu, graphs, shortest paths, sortings

Colorful Bricks

combinatorics, dp, math

Farewell Party

constructive algorithms, implementation

Definite Game

constructive algorithms, math

Katya and Segments Sets

data structures, interactive, sortings

Sonya and Matrix Beauty

strings

Olya and magical square

constructive algorithms, implementation, math

Masha and two friends

implementation

Margarite and the best present

math

Petya and Origami

math

Negative Time Summation

constructive algorithms

Pictures with Kittens (hard version)

data structures, dp

Pictures with Kittens (easy version)

dp

Thematic Contests

greedy, sortings

Cutting Out

binary search, sortings

Good Array

Disturbed People

greedy

Frog Jumping

math

Array Game

data structures, games

Summer Practice Report

dp, greedy

Vasya and a Tree

data structures, trees

Edge Deletion

graphs, greedy, shortest paths

Meme Problem

binary search, math

Divisor Subtraction

implementation, math, number theory

Minimizing the String

greedy, strings

Taxi drivers and Lyft

implementation, sortings

The King's Race

implementation, math

Yet Another LCP Problem

data structures, string suffix structures

Choosing Two Paths

dfs and similar, dp, greedy, trees

Segment Sum

bitmasks, combinatorics, dp, math

Berland Fair

binary search, brute force, data structures, greedy

Vasya and Robot

binary search, two pointers