Hill Climbing

dfs and similar, geometry, trees

Graph Cutting

dfs and similar, graphs

Maze 1D

binary search, greedy, implementation

Two Rooted Trees

data structures, implementation, trees

Beautiful Pairs of Numbers

combinatorics, dp

Strictly Positive Matrix

graphs, math

Olympic Games

math

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

George and Cards

binary search, data structures

George and Interesting Graph

graph matchings

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

Vowels

combinatorics, divide and conquer, dp

Antimatter

dp

Propagating tree

data structures, dfs and similar, trees

Volcanoes

binary search, implementation, sortings, two pointers

Ksenia and Combinatorics

combinatorics, dp

Ksenia and Pawns

dfs and similar, graphs, implementation, trees

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

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

Red and Black Tree

dp, implementation, math

Tree and Queries

data structures, dfs and similar, trees

Circling Round Treasures

bitmasks, shortest paths

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Inna and Sequence

binary search, data structures, dp, trees

Inna and Pink Pony

greedy, implementation

Drawing Circles is Fun

combinatorics, geometry

Choosing Subtree is Fun

binary search, data structures, dfs and similar, trees, two pointers

Watching Fireworks is Fun

data structures, dp, math

Subway Innovation

greedy, math, two pointers

Summer Reading

dp, greedy

Broken Monitor

brute force, constructive algorithms, greedy, implementation

Valera and Queries

binary search, data structures

Valera and Fools

dfs and similar, dp, graphs, shortest paths

Sereja and Intervals

combinatorics, dp

Sereja and Sets

bitmasks, dfs and similar

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Dima and Magic Guitar

brute force, implementation, math

Dima and Trap Graph

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

Empty Rectangles

divide and conquer, two pointers

Ghd

brute force, math, probabilities

Beautiful Set

brute force, number theory

Free Market

dp, greedy

Two Circles

brute force, data structures, implementation

Petya and Pipes

flows, graphs, shortest paths

Fools and Foolproof Roads

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

Levko and Game

graphs, greedy, shortest paths

Levko and Sets

number theory

Levko and Strings

combinatorics, dp

Levko and Array

binary search, dp

Neatness

constructive algorithms, dfs and similar

Pair of Numbers

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

Dima and Kicks

brute force, dsu, graphs, implementation

Dima and Containers

constructive algorithms, greedy, implementation

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Bags and Coins

bitmasks, constructive algorithms, dp, greedy

Compartments

combinatorics, constructive algorithms, greedy, implementation

Lucky Number Representation

constructive algorithms, dfs and similar, dp

Transferring Pyramid

dp

Vasya and Beautiful Arrays

brute force, dp, number theory

Game with Strings

bitmasks, dp, games

Antichain

dp, graph matchings, greedy

Queue

constructive algorithms, dp

Jeff and Permutation

greedy

Jeff and Removing Periods

data structures

Jeff and Brackets

dp, matrices

Wrong Floyd

brute force, constructive algorithms, dfs and similar, graphs

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Pilgrims

dfs and similar, dp, trees

Turtles

dp, matrices

Subset Sums

brute force, data structures

Apple Tree

dfs and similar, number theory, trees

Doodle Jump

math, number theory

Robot Control

dp, graphs, shortest paths

Number Transformation II

greedy, math

Lucky Common Subsequence

dp, strings

Suffix Subgroup

*special problem, strings

Superstitions Inspection

*special problem

Black Cat Rush

*special problem

Chain Letter

*special problem, dfs and similar, graphs

Counting Fridays

*special problem

Triskaidekaphobia

*special problem

Pumping Stations

brute force, dfs and similar, divide and conquer, flows, graphs, greedy, trees