Two Sets

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

Information Graph

dfs and similar, dsu, graphs, trees

Increase Sequence

combinatorics, dp

Wonder Room

brute force, math

Substitutes in Number

dp

Restore Cube

brute force, geometry

Caisa and Tree

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

Appleman and Tree

dfs and similar, dp, trees

Elections

brute force

Civilization

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

Little Pony and Harmony Chest

bitmasks, brute force, dp

Magic Trick

combinatorics, math, probabilities

Count Good Substrings

math

Jzzhu and Cities

graphs, greedy, shortest paths

DZY Loves Modification

brute force, data structures, greedy

Valera and Swaps

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

Devu and Birthday Celebration

combinatorics, dp, math

Special Grid

brute force, dp, greedy

Nanami's Digital Board

dsu, implementation

Prefixes and Suffixes

dp, string suffix structures, strings, two pointers

Random Task

binary search, bitmasks, combinatorics, dp, math

Police Patrol

greedy, implementation, math, ternary search

Mashmokh and Reverse Operation

combinatorics, divide and conquer

2048

bitmasks, dp

Giving Awards

dfs and similar

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 Card Game

games, greedy, sortings

Game with Points

dp, graphs, implementation, shortest paths

Diverse Substrings

dp, strings, two pointers

Propagating tree

data structures, dfs and similar, trees

Number Busters

binary search, math

Sereja and Brackets

data structures, schedules

New Year Letter

bitmasks, brute force, dp

Inna and Sequence

binary search, data structures, dp, trees

Inna and Pink Pony

greedy, implementation

Watching Fireworks is Fun

data structures, dp, math

Subway Innovation

greedy, math, two pointers

Broken Monitor

brute force, constructive algorithms, greedy, implementation

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Dima and Trap Graph

binary search, data structures, dfs and similar, dsu, shortest paths, two pointers

Fools and Foolproof Roads

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

Levko and Array

binary search, dp

Pair of Numbers

binary search, brute force, data structures, math, two pointers

Dima and Containers

constructive algorithms, greedy, implementation

Compartments

combinatorics, constructive algorithms, greedy, implementation

Vasya and Beautiful Arrays

brute force, dp, number theory

Queue

constructive algorithms, dp

Apple Tree

dfs and similar, number theory, trees

Lucky Common Subsequence

dp, strings

Counting Fridays

*special problem

Triskaidekaphobia

*special problem

Water Tree

data structures, dfs and similar, graphs, trees

Xenia and Dominoes

bitmasks, dfs and similar, dp

Iahub and Permutations

combinatorics, math

Maximal Area Quadrilateral

brute force, geometry

Book of Evil

dfs and similar, divide and conquer, dp, trees

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

More Reclamation

games

Characteristics of Rectangles

binary search, bitmasks, brute force, implementation, sortings

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Kalila and Dimna in the Logging Industry

dp, geometry

Ants

brute force, implementation

Sereja and Subsequences

data structures, dp

Sereja and Periods

binary search, dfs and similar, strings

Ilya and Roads

dp

Context Advertising

dp, two pointers

Morning run

binary search, math, two pointers

White, Black and White Again

combinatorics, number theory

Optimizer

data structures, greedy, sortings

Yaroslav and Time

binary search, graphs, shortest paths

Yaroslav and Two Strings

combinatorics, dp

Greg and Friends

combinatorics, dp, graphs, shortest paths

Beautiful IP Addresses

brute force

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Main Sequence

greedy, implementation

Coin Troubles

dp

Yet Another Number Game

dp, games

Rectangle Puzzle

geometry

Little Girl and Problem on Trees

data structures, graphs, trees

Flawed Flow

constructive algorithms, flows, graphs, greedy

Playlist

math, probabilities, sortings

Dominoes

dfs and similar, graphs

Below the Diagonal

constructive algorithms, greedy, math

Choosing Balls

dp

Circle of Numbers

brute force, dfs and similar, implementation

Maxim and Matrix

constructive algorithms, dp, math

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

Little Elephant and LCM

binary search, combinatorics, dp, math

Dormitory

dp, implementation

Table with Letters - 2

brute force, two pointers

Number Transformation

dp, greedy, number theory

Mad Joe

brute force

Robo-Footballer

binary search, geometry

Log Stream Analysis

binary search, brute force, implementation, strings

Hydra

graphs, sortings

XOR on Segment

bitmasks, data structures

Dispute

dfs and similar, graphs, greedy

Mirror Box

geometry, implementation