Beautiful numbers

dp, number theory

Pie or die

games

Smallest number

brute force

Vacuum Сleaner

geometry

Writing a Song

brute force, dp, strings

First Digit Law

dp, math, probabilities

Cutting Jigsaw Puzzle

hashing, implementation

Dead Ends

bitmasks, dp

Blog Photo

binary search, implementation

Circular RMQ

data structures

Right Triangles

combinatorics

Caterpillar

dfs and similar, dp, graphs, trees

Pentagon

combinatorics, graphs, matrices

Geometrical problem

implementation

Three Base Stations

binary search, greedy

bHTML Tables Analisys

expression parsing

Square Equation Roots

math

Bombing

binary search, dp, probabilities

Happy Farm 5

geometry

Common ancestor

dp

Game

brute force, dp, implementation

Disposition

constructive algorithms, math

Black and White

constructive algorithms

Galaxy Union

dp, trees, two pointers

Snow sellers

greedy, sortings

Ivan the Fool VS Gorynych the Dragon

dp, games, graphs

The Race

math

Cannon

data structures, geometry, sortings

Safe

brute force

Crossword

implementation

Emperor's Problem

geometry

Hercule Poirot Problem

dsu, graphs

Comb

data structures, dp

Parking Lot

data structures, implementation

Hamsters and Tigers

two pointers

Planting Trees

constructive algorithms

Road Problem

graphs

Prime Problem

number theory

Goats and Wolves

greedy

Director

constructive algorithms, greedy

Event Dates

greedy, meet-in-the-middle, sortings

Dancing Lessons

data structures

School

dp, dsu

Triminoes

constructive algorithms, greedy

Toys

brute force, combinatorics

Phone Number

dp

Shooting Gallery

data structures, implementation

BerPaint

geometry, graphs

Hyperdrive

math

Race

brute force, implementation, two pointers

Journey

brute force, constructive algorithms, implementation

Baldman and the military

dfs and similar, graphs, trees

Strange town

constructive algorithms, math

Safe cracking

brute force, constructive algorithms

Game of chess unfinished

implementation

3-cycles

constructive algorithms, graphs, greedy

Pawn

dp

Number Table

combinatorics

Interesting Sequence

math

Berland Square

implementation, math

Repaintings

math

Testing

Tram

Inverse Function

implementation

What Has Dirichlet Got to Do with That?

dp, games

Moon Craters

dp, sortings

C*++ Calculations

expression parsing, greedy

The Great Marathon

dp

Queue

data structures

Smart Boy

dp, games, strings

Let's Go Rolling!

dp, sortings

Vasya the Architect

implementation

Trial for Chief

graphs, greedy, shortest paths

Lesson Timetable

combinatorics, dp, math

Old Berland Language

data structures, greedy, trees

Computer Game

greedy, implementation

Two Paths

constructive algorithms, dsu, graphs, implementation

New Game with a Chess Piece

games

Bowls

geometry, implementation

Fractal

implementation

Parade

data structures, sortings

Animals

dp, greedy

Warehouse

implementation

Collisions

brute force, implementation, math

Road Map

dfs and similar, graphs

Helper

Knights

geometry, graphs, shortest paths, sortings

Wonderful Randomized Sum

greedy

String Problem

shortest paths

Hide-and-Seek

geometry, implementation

Constellation

implementation

Flea

math

TV Game

dp

Chocolate

dfs and similar, implementation

Schedule

implementation

Tricky and Clever Password

binary search, constructive algorithms, data structures, greedy, hashing, strings

King's Problem?

geometry, greedy

Shooting Gallery

dp, probabilities

Codeforces World Finals

implementation

Quarrel

graphs, shortest paths