Hack it!

binary search, constructive algorithms, math

Two Sets

2-sat, dfs and similar, dsu, graph matchings, greedy

Alex and Complicated Task

data structures, dp, greedy

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Information Graph

dfs and similar, dsu, graphs, trees

Increase Sequence

combinatorics, dp

Wonder Room

brute force, math

The Classic Problem

data structures, graphs, shortest paths

World of Darkraft - 2

dp, probabilities

Substitutes in Number

dp

Restore Cube

brute force, geometry

Caisa and Tree

brute force, dfs and similar, math, number theory, trees

Appleman and a Game

binary search, shortest paths, strings

Appleman and Complicated Task

dsu, math

Appleman and a Sheet of Paper

data structures, implementation

Appleman and Tree

dfs and similar, dp, trees

Roland and Rose

brute force, geometry, math, sortings

Little Victor and Set

brute force, constructive algorithms, math

An easy problem about trees

dp, games, greedy, trees

Flow Optimality

constructive algorithms, flows, math

Bingo!

combinatorics, math, probabilities

Elections

brute force

Function

data structures

Serega and Fun

data structures

Civilization

dfs and similar, dp, dsu, ternary search, trees

Little Pony and Lord Tirek

data structures

Little Pony and Elements of Harmony

dp, matrices

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs

Little Pony and Harmony Chest

bitmasks, brute force, dp

Permutation

data structures, divide and conquer, hashing

Three strings

data structures, dsu, string suffix structures, strings

Magic Trick

combinatorics, math, probabilities

Devu and Flowers

bitmasks, combinatorics, number theory

Count Good Substrings

math

Jzzhu and Squares

dp, math, number theory

Jzzhu and Numbers

bitmasks, combinatorics, dp

Jzzhu and Apples

constructive algorithms, number theory

Jzzhu and Cities

graphs, greedy, shortest paths

Divisors

brute force, dfs and similar, implementation, number theory

DZY Loves Bridges

math, matrices

DZY Loves Games

math, matrices, probabilities

DZY Loves Fibonacci Numbers

data structures, math, number theory

DZY Loves Modification

brute force, data structures, greedy

DZY Loves Planting

binary search, dsu, trees

DZY Loves Strings

binary search, hashing, strings, two pointers

DZY Loves Colors

data structures

DZY Loves FFT

probabilities

Gena and Second Distance

geometry

Adam and Tree

data structures, trees

Artem and Array

data structures, greedy

Valera and Number

bitmasks, dp, math, probabilities

Valera and Swaps

constructive algorithms, dsu, graphs, implementation, math, string suffix structures

Berland Federalization

dp, trees

Devu and Birthday Celebration

combinatorics, dp, math

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

The Child and Sequence

data structures, math

The Child and Polygon

dp, geometry

Banners

brute force, data structures, dp

Cardboard Box

data structures, greedy

Pudding Monsters

dp

Special Graph

Special Grid

brute force, dp, greedy

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Nanami's Power Plant

flows

Tachibana Kanade's Tofu

dp

Nanami's Digital Board

dsu, implementation

Square Tiling

constructive algorithms, greedy

Prefixes and Suffixes

dp, string suffix structures, strings, two pointers

Chemistry Experiment

binary search, data structures, ternary search

Random Task

binary search, bitmasks, combinatorics, dp, math

Points and Segments

graphs

Tricky Function

data structures, divide and conquer, geometry

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

Police Patrol

greedy, implementation, math, ternary search

Match & Catch

dp, string suffix structures, strings

Sereja and Sets

dp

Sereja and Squares

binary search, data structures, hashing

Sereja and Two Sequences

data structures, dp

Sereja and Table

bitmasks, greedy

Colored Jenga

dfs and similar, dp, probabilities

Biathlon Track

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

Playing the ball

geometry

Cup Trick

data structures

Tricky Password

data structures

Big Problems for Organizers

data structures, graphs, trees

Square Table

constructive algorithms, math, probabilities

President's Path

dp, graphs, shortest paths

Population Size

greedy, implementation, math

Mashmokh's Designed Problem

data structures

Mashmokh and Water Tanks

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

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Maze 2D

data structures, divide and conquer

2048

bitmasks, dp

Giving Awards

dfs and similar

Feed the Golorp

*special problem

On a plane

*special problem, geometry

k-d-sequence

data structures

Largest Submatrix 3

dp, hashing

Curious Array

brute force, combinatorics, implementation, math

Hamming Triples

implementation, math, two pointers