George and Cards

binary search, data structures

Mushroom Gnomes - 2

binary search, data structures, probabilities, sortings

Duplicates

Furlo and Rublo and Game

games, implementation, math

Thwarting Demonstrations

binary search, data structures, trees

Bear and Floodlight

bitmasks, dp, geometry

Evaluate It and Back Again

constructive algorithms, implementation, math

Cup Trick

data structures

Wrong Floyd

brute force, constructive algorithms, dfs and similar, graphs

Dima and Magic Guitar

brute force, implementation, math

Safe

brute force

Paint Tree

constructive algorithms, divide and conquer, geometry, sortings, trees

Restoring Numbers

constructive algorithms, math

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Music in Car

data structures, greedy, two pointers

Award Ceremony

greedy, implementation

The Minimum Number of Variables

bitmasks, dp

Running Over The Bridges

greedy, implementation, math

Middle-Out

constructive algorithms, greedy, strings

Nuclear Fusion

bitmasks, dp

Maze 2D

data structures, divide and conquer

Ksenia and Pawns

dfs and similar, graphs, implementation, trees

GCD Festival

math, number theory

Interstellar battle

math, probabilities, trees

Smart Cheater

data structures, math, probabilities

Clear The Matrix

bitmasks, dp

Berland Federalization

dp, trees

Knitting Batik

implementation, math

Maximum Control (medium)

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

FreeDiv

dfs and similar, graphs, greedy

Twin Friends

combinatorics, dp

Parking Lot

data structures

Solitaire

brute force, implementation

Heidi and the Turing Test (Medium)

data structures

Cyclic Coloring

dfs and similar

Plumber

math

How Many Squares?

implementation

Chemistry Lab

dp, geometry, probabilities

Automatic Door

implementation

Holiday Wall Ornaments

dp, strings

Antichain

dp, graph matchings, greedy

Maze 1D

binary search, greedy, implementation

Competition

data structures, greedy

Lucky Tickets

binary search, data structures, sortings, two pointers

Tidying Up

flows

Product transformation

combinatorics, math, number theory

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Mysterious language again, seriously?

*special problem

Ancient Language

graphs, sortings

Petya and Tree

binary search, dfs and similar, probabilities, sortings, trees

Printer

binary search, data structures, implementation, sortings

Colorado Potato Beetle

dfs and similar, implementation

On a plane

*special problem, geometry

Tests Renumeration

greedy, implementation

Jamie and To-do List

data structures, interactive, trees

Three Horses

constructive algorithms, math, number theory

Good Substrings

string suffix structures

Swaps

constructive algorithms, graphs, greedy

Olya and Graph

combinatorics, math

Safe cracking

brute force, constructive algorithms

Fake News (medium)

constructive algorithms, strings

Suggested Friends

brute force, graphs

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Geometrical problem

implementation

Tetris revisited

constructive algorithms, graph matchings, greedy, math

Two progressions

constructive algorithms, greedy

Leaders

dfs and similar, dsu, graphs, trees

Tournament-graph

constructive algorithms, graphs

Caesar Cipher

*special problem

Cannon

data structures, geometry, sortings

Representative Sampling

dp, sortings, strings

Synchrophasotron

brute force

Luck is in Numbers

greedy

Bowls

geometry, implementation

Mister B and Boring Game

games, greedy

Battlefield

geometry, graphs, implementation, shortest paths

Greedy Elevator

data structures, implementation

Beautiful Function

constructive algorithms, math

Item World

brute force, implementation, sortings

BHTML+BCSS

*special problem, dfs and similar, expression parsing

School

dp, dsu

Repairing Of String

*special problem, constructive algorithms

Marmots (medium)

math

Puzzling Language

constructive algorithms

Endless Roses Most Beautiful

Palindromic Doubles

*special problem, data structures, dp

Игра в Девятку II

*special problem, brute force

Suns and Rays

dfs and similar, implementation

Suns and Rays

constructive algorithms, dfs and similar, implementation

Path Canonization

*special problem

Help King

implementation, probabilities, trees

Chain Letter

*special problem, dfs and similar, graphs

Game with Two Trees

INI-file

*special problem, implementation

Suffix Subgroup

*special problem, strings

Hungarian Notation

*special problem

Lomsat gelral

data structures, dfs and similar, dsu, trees

The Child and Sequence

data structures, math

A Simple Task

data structures, sortings, strings

Legacy

data structures, graphs, shortest paths