Hungarian Notation

*special problem

Suffix Subgroup

*special problem, strings

Chain Letter

*special problem, dfs and similar, graphs

INI-file

*special problem, implementation

Game with Two Trees

Help King

implementation, probabilities, trees

Path Canonization

*special problem

Suns and Rays

constructive algorithms, dfs and similar, implementation

Suns and Rays

dfs and similar, implementation

Игра в Девятку II

*special problem, brute force

Palindromic Doubles

*special problem, data structures, dp

Endless Roses Most Beautiful

Puzzling Language

constructive algorithms

Marmots (medium)

math

Repairing Of String

*special problem, constructive algorithms

School

dp, dsu

BHTML+BCSS

*special problem, dfs and similar, expression parsing

Item World

brute force, implementation, sortings

Beautiful Function

constructive algorithms, math

Greedy Elevator

data structures, implementation

Battlefield

geometry, graphs, implementation, shortest paths

Mister B and Boring Game

games, greedy

Bowls

geometry, implementation

Luck is in Numbers

greedy

Synchrophasotron

brute force

Representative Sampling

dp, sortings, strings

Cannon

data structures, geometry, sortings

Caesar Cipher

*special problem

Tournament-graph

constructive algorithms, graphs

Leaders

dfs and similar, dsu, graphs, trees

Two progressions

constructive algorithms, greedy

Tetris revisited

constructive algorithms, graph matchings, greedy, math

Geometrical problem

implementation

Harry Potter and the Sorting Hat

brute force, dfs and similar, hashing

Suggested Friends

brute force, graphs

Fake News (medium)

constructive algorithms, strings

Safe cracking

brute force, constructive algorithms

Olya and Graph

combinatorics, math

Swaps

constructive algorithms, graphs, greedy

Good Substrings

string suffix structures

Three Horses

constructive algorithms, math, number theory

Jamie and To-do List

data structures, interactive, trees

Tests Renumeration

greedy, implementation

On a plane

*special problem, geometry

Colorado Potato Beetle

dfs and similar, implementation

Printer

binary search, data structures, implementation, sortings

Ancient Language

graphs, sortings

Petya and Tree

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

Mysterious language again, seriously?

*special problem

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Product transformation

combinatorics, math, number theory

Tidying Up

flows

Maze 1D

binary search, greedy, implementation

Competition

data structures, greedy

Lucky Tickets

binary search, data structures, sortings, two pointers

Antichain

dp, graph matchings, greedy

Holiday Wall Ornaments

dp, strings

Automatic Door

implementation

Chemistry Lab

dp, geometry, probabilities

Plumber

math

How Many Squares?

implementation

Cyclic Coloring

dfs and similar

Heidi and the Turing Test (Medium)

data structures

Solitaire

brute force, implementation

Parking Lot

data structures

Twin Friends

combinatorics, dp

Maximum Control (medium)

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

FreeDiv

dfs and similar, graphs, greedy

Knitting Batik

implementation, math

Clear The Matrix

bitmasks, dp

Berland Federalization

dp, trees

Smart Cheater

data structures, math, probabilities

Interstellar battle

math, probabilities, trees

GCD Festival

math, number theory

Ksenia and Pawns

dfs and similar, graphs, implementation, trees

Maze 2D

data structures, divide and conquer

Nuclear Fusion

bitmasks, dp

Middle-Out

constructive algorithms, greedy, strings

Running Over The Bridges

greedy, implementation, math

The Minimum Number of Variables

bitmasks, dp

Award Ceremony

greedy, implementation

Dating

greedy, sortings, trees

Music in Car

data structures, greedy, two pointers

BinCoin

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

Restoring Numbers

constructive algorithms, math

Paint Tree

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

Dima and Magic Guitar

brute force, implementation, math

Safe

brute force

Wrong Floyd

brute force, constructive algorithms, dfs and similar, graphs

Cup Trick

data structures

Evaluate It and Back Again

constructive algorithms, implementation, math

Bear and Floodlight

bitmasks, dp, geometry

Thwarting Demonstrations

binary search, data structures, trees

Furlo and Rublo and Game

games, implementation, math

Mushroom Gnomes - 2

binary search, data structures, probabilities, sortings

George and Cards

binary search, data structures

Duplicates

Run for beer

dfs and similar, shortest paths

Lucky Number Representation

constructive algorithms, dfs and similar, dp

Inverse of Rows and Columns

brute force, constructive algorithms