Working out

dp

Police Patrol

greedy, implementation, math, ternary search

Match & Catch

dp, string suffix structures, strings

Checkposts

dfs and similar, graphs, two pointers

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

Magic Formulas

math

Bug in Code

binary search, data structures, sortings

Playing the ball

geometry

Cup Trick

data structures

Bug in Code

data structures, graphs, implementation, two pointers

Online Meeting

implementation

Tricky Password

data structures

Big Problems for Organizers

data structures, graphs, trees

Square Table

constructive algorithms, math, probabilities

Cunning Gena

bitmasks, dp, greedy, sortings

President's Path

dp, graphs, shortest paths

Population Size

greedy, implementation, math

Booking System

binary search, dp, greedy, implementation

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

E-mail Addresses

implementation

Giving Awards

dfs and similar

Kicker

*special problem, implementation

Multi-core Processor

implementation

Feed the Golorp

*special problem

On a plane

*special problem, geometry

000001

*special problem

Dome

*special problem

Big Data

*special problem

Magnum Opus

*special problem

Mysterious Language

*special problem

The Great Game

*special problem

k-d-sequence

data structures

Largest Submatrix 3

dp, hashing

Curious Array

brute force, combinatorics, implementation, math

Long Path

dp, implementation

Triangle

brute force, geometry, implementation, math

Hamming Triples

implementation, math, two pointers

Hill Climbing

dfs and similar, geometry, trees

Graph Cutting

dfs and similar, graphs

Toy Sum

greedy, implementation, math

Unusual Product

implementation, math

Maze 1D

binary search, greedy, implementation

Minesweeper 1D

dp, implementation

Restore Graph

dfs and similar, graphs, sortings

Two Rooted Trees

data structures, implementation, trees

Beautiful Pairs of Numbers

combinatorics, dp

Strictly Positive Matrix

graphs, math

Upgrading Array

dp, greedy, math, number theory

Roman and Numbers

bitmasks, brute force, combinatorics, dp, number theory

Inna and Binary Logic

binary search, bitmasks, data structures

Dima and Bacteria

dsu, graphs, shortest paths

Fox and Meteor Shower

geometry

Fox and Perfect Sets

math

Fox and Card Game

games, greedy, sortings

Fox and Minimal path

bitmasks, constructive algorithms, graphs, implementation, math

George and Cards

binary search, data structures

George and Interesting Graph

graph matchings

George and Number

greedy, implementation

Game with Points

dp, graphs, implementation, shortest paths

Diverse Substrings

dp, strings, two pointers

Bear in the Field

math, matrices

Bear and Floodlight

bitmasks, dp, geometry

Bear and Prime Numbers

binary search, brute force, data structures, dp, implementation, math, number theory

Vowels

combinatorics, divide and conquer, dp

Antimatter

dp

Propagating tree

data structures, dfs and similar, trees

Volcanoes

binary search, implementation, sortings, two pointers

Milking cows

data structures, greedy

Ksenia and Combinatorics

combinatorics, dp

Ksenia and Pawns

dfs and similar, graphs, implementation, trees

Arithmetic Progression

implementation, sortings

Number Busters

binary search, math

Sereja and Dividing

data structures

Sereja and Cinema

combinatorics, math

Sereja and Brackets

data structures, schedules

Sereja and Tree

graphs, implementation

Sereja and Prefixes

binary search, brute force

New Year Cactus

dp

New Year Tree

data structures, divide and conquer, trees

New Year Tree Decorations

geometry, schedules, sortings

New Year Letter

bitmasks, brute force, dp

Cookie Clicker

dp, geometry

Developing Game

data structures

Captains Mode

bitmasks, dp, games

Preparing for the Contest

binary search, data structures, greedy, sortings

Maze

dfs and similar

Red and Black Tree

dp, implementation, math

Tree and Queries

data structures, dfs and similar, trees

Circling Round Treasures

bitmasks, shortest paths

Maximum Submatrix 2

data structures, dp, implementation, sortings

Divisible by Seven

math, number theory