One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Xor-tree

dfs and similar, trees

Checkposts

dfs and similar, graphs, two pointers

Colored Jenga

dfs and similar, dp, probabilities

Giving Awards

dfs and similar

Hill Climbing

dfs and similar, geometry, trees

Graph Cutting

dfs and similar, graphs

Restore Graph

dfs and similar, graphs, sortings

Propagating tree

data structures, dfs and similar, trees

Ksenia and Pawns

dfs and similar, graphs, implementation, trees

Maze

dfs and similar

Tree and Queries

data structures, dfs and similar, trees

Inna and Dima

dfs and similar, dp, graphs, implementation

Choosing Subtree is Fun

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

Valera and Fools

dfs and similar, dp, graphs, shortest paths

Valera and Elections

dfs and similar, graphs, trees

Sereja and Sets

bitmasks, dfs and similar

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

Neatness

constructive algorithms, dfs and similar

Lucky Number Representation

constructive algorithms, dfs and similar, dp

Wrong Floyd

brute force, constructive algorithms, dfs and similar, graphs

Pilgrims

dfs and similar, dp, trees

Apple Tree

dfs and similar, number theory, trees

Chain Letter

*special problem, dfs and similar, graphs

Pumping Stations

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

Water Tree

data structures, dfs and similar, graphs, trees

Xenia and Dominoes

bitmasks, dfs and similar, dp

Three Swaps

constructive algorithms, dfs and similar, greedy

Xenia and Weights

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Book of Evil

dfs and similar, divide and conquer, dp, trees

Escaping on Beaveractor

dfs and similar, implementation

Biridian Forest

dfs and similar, shortest paths

Block Tower

constructive algorithms, dfs and similar, graphs

The Red Button

combinatorics, dfs and similar, dsu, graphs, greedy

Monsters and Diamonds

dfs and similar, graphs, shortest paths

Ciel the Commander

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

Ping-Pong (Easy Version)

dfs and similar, graphs

Balance

constructive algorithms, dfs and similar, graphs, trees

Suns and Rays

constructive algorithms, dfs and similar, implementation

Suns and Rays

dfs and similar, implementation

EKG

dfs and similar, dp

EKG

brute force, dfs and similar

Sereja and Periods

binary search, dfs and similar, strings

Coach

brute force, dfs and similar, graphs

Connected Components

data structures, dfs and similar, dp, dsu

Tree-String Problem

*special problem, dfs and similar, hashing, strings

Greedy Petya

*special problem, dfs and similar, graphs, greedy

Polo the Penguin and Trees

combinatorics, dfs and similar, trees

Cow Program

dfs and similar, dp, graphs

Learning Languages

dfs and similar, dsu

Lovely Matrix

dfs and similar, graphs, greedy, sortings

Zero Tree

dfs and similar, dp, greedy, trees

Dominoes

dfs and similar, graphs

Cycle in Graph

dfs and similar, graphs

Circle of Numbers

brute force, dfs and similar, implementation

Little Elephant and Tree

data structures, dfs and similar, trees

Rats

brute force, dfs and similar, graphs, implementation, shortest paths

Text Editor

data structures, dfs and similar, graphs, greedy, shortest paths

Tree and Table

dfs and similar, dp, implementation, trees

Blood Cousins Return

binary search, data structures, dfs and similar, dp, sortings

Colorful Graph

brute force, dfs and similar, graphs

Undoubtedly Lucky Numbers

bitmasks, brute force, dfs and similar

Colorado Potato Beetle

dfs and similar, implementation

Dispute

dfs and similar, graphs, greedy

King's Path

dfs and similar, graphs, hashing, shortest paths

Road Repairs

dfs and similar, graphs, greedy

World Eater Brothers

dfs and similar, dp, greedy, trees

T-decomposition

dfs and similar, graphs, greedy, trees

Cactus

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

The Road to Berland is Paved With Good Intentions

2-sat, dfs and similar, dsu, graphs

Snake

bitmasks, dfs and similar, graphs, implementation

Choosing Capital for Treeland

dfs and similar, dp, graphs, trees

Bitonix' Patrol

bitmasks, brute force, combinatorics, dfs and similar, math

Ice Skating

brute force, dfs and similar, dsu, graphs

Forming Teams

dfs and similar, implementation

Game

dfs and similar, greedy

IT Restaurants

dfs and similar, dp, trees

Blood Cousins

binary search, data structures, dfs and similar, trees

Solitaire

dfs and similar, dp

Infinite Maze

dfs and similar, graphs

Fools and Roads

data structures, dfs and similar, trees

STL

dfs and similar

Weak Memory

dfs and similar, dsu

Cyclic Coloring

dfs and similar

Party

brute force, dfs and similar, dsu, graphs

Party

dfs and similar, dsu, graphs

Archaeology

data structures, dfs and similar, trees

Chamber of Secrets

dfs and similar, shortest paths

BHTML+BCSS

*special problem, dfs and similar, expression parsing

Wizards and Bets

dfs and similar, graphs, math, matrices

Compatible Numbers

bitmasks, brute force, dfs and similar, dp

Variable, or There and Back Again

dfs and similar, graphs

e-Government

data structures, dfs and similar, dp, strings, trees

Distance in Tree

dfs and similar, dp, trees

Edges in MST

dfs and similar, dsu, graphs, sortings

Quantity of Strings

combinatorics, dfs and similar, graphs, math

Missile Silos

data structures, dfs and similar, graphs, shortest paths

Cycle

brute force, dfs and similar, implementation

Pairs of Numbers

brute force, dfs and similar, math, number theory