Ann and Half-Palindrome

data structures, dp, graphs, string suffix structures, strings, trees

Bracket Substring

dp, strings

Biologist

flows

Tokens on Graph

constructive algorithms, dfs and similar, graphs, shortest paths

DZY Loves FFT

probabilities

Teams Formation

data structures, implementation

Empire Strikes Back

binary search, math, number theory

Side Transmutations

combinatorics, strings

Sagheer and Apple Tree

games, trees

Barrels and boxes

brute force, combinatorics, math, number theory, probabilities

Hiking

binary search, dp

Interestring graph and Apples

dfs and similar, dsu, graphs

Nauuo and Pictures (easy version)

dp, probabilities

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

Nudist Beach

binary search, graphs, greedy

Game with Powers

dp, games

Little Victor and Set

brute force, constructive algorithms, math

Famil Door and Roads

combinatorics, data structures, dfs and similar, dp, probabilities, trees

Bear and Drawing

constructive algorithms, dfs and similar, trees

Fence Divercity

combinatorics, dp, number theory

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Eyes Closed

data structures, probabilities

Similar Sets

data structures, graphs, implementation

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

Help Caretaker

brute force, dp

Shaass the Great

dp, trees

Sereja and Two Sequences

data structures, dp

Matching Names

dfs and similar, strings, trees

Fafa and Ancient Mathematics

dfs and similar, dp, trees

Take-off Ramps

graphs, shortest paths

Moving Platforms

graphs, math, number theory, shortest paths

Progress Monitoring

dp, trees

Personality Test

Ski Base

combinatorics, dsu, graphs

Vasya and Templates

greedy, implementation, strings

Berland collider

binary search

Turtle Magic: Royal Turtle Shell Pattern

bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math

Chemistry in Berland

dfs and similar, greedy, trees

Restore a Number

brute force, constructive algorithms, strings

Beautiful Road

dfs and similar, dp, dsu, graphs, implementation, sortings, trees

Illusions of the Desert

data structures, trees

Zbazi in Zeydabad

data structures, implementation

Monsters and Potions

brute force, dp, greedy, implementation

Curfew

binary search, brute force, greedy, sortings

Clearing Up

constructive algorithms, dp, dsu, graphs

Fibonacci Sums

dp, math

Superset

constructive algorithms, divide and conquer

Danger of Mad Snakes

combinatorics, dp, math

The Coronation

graphs, implementation

Petya and Pipes

flows, graphs, shortest paths

Set of Points

constructive algorithms, geometry

Timetable

constructive algorithms, data structures, greedy, math

Polycarp's problems

binary search, dp, greedy

Alex and Complicated Task

data structures, dp, greedy

Painting Square

dp, fft

Petya and Coloring

combinatorics, dp

Discarding Game

dp, greedy, two pointers

Collective Mindsets (medium)

Tiling Terrace

brute force, dp

Streets and Avenues in Berhattan

dp

New Game with a Chess Piece

games

Edo and Magnets

brute force, greedy, implementation, two pointers

Mashmokh and Water Tanks

binary search, data structures, greedy, trees, two pointers

Queue

data structures

Wilbur and Trees

dp, math, probabilities, sortings

Castle

dp, greedy, probabilities, sortings, trees

Imagination Castle

dp, games, two pointers

Square Tiling

constructive algorithms, greedy

Wizards and Numbers

games, math

Common ancestor

dp

Santa Clauses and a Soccer Championship

constructive algorithms, dfs and similar, graphs, trees

Hyperspace Highways

dfs and similar, graphs, trees

Tidying Up

flows, graph matchings

Downloading B++

binary search, implementation

Chip Play

brute force, data structures, implementation

Tourist

binary search, data structures, dp

Playing with String

games

Brackets

combinatorics, dp, greedy

Beautiful Set

brute force, number theory

Vanya and Balloons

binary search, brute force, dp, implementation

Horseback Riding

flows, graphs

Road Construction

flows, graphs

Bear in the Field

math, matrices

Biathlon Track

binary search, brute force, constructive algorithms, data structures, dp

Dating

brute force, dfs and similar, graphs, trees

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Evacuation

flows, graphs, shortest paths

Joy of Pokémon Observation

Widget Library

dp, expression parsing, graphs, implementation

Summer Homework

data structures, math

Cleaning Robots

dp, trees

Wall Bars

dp

Rats

brute force, dfs and similar, graphs, implementation, shortest paths

Awards For Contestants

brute force, data structures, dp

PE Lesson

brute force, dp

Similar Words

dp, hashing, strings, trees

Sweets for Everyone!

binary search, greedy, implementation

Building an Amusement Park

binary search, geometry

Party Organization

brute force, math, probabilities