Chain Letter

*special problem, dfs and similar, graphs

Battlefield

geometry, graphs, implementation, shortest paths

Tournament-graph

constructive algorithms, graphs

Leaders

dfs and similar, dsu, graphs, trees

Suggested Friends

brute force, graphs

Swaps

constructive algorithms, graphs, greedy

Ancient Language

graphs, sortings

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Maximum Control (medium)

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

FreeDiv

dfs and similar, graphs, greedy

Ksenia and Pawns

dfs and similar, graphs, implementation, trees

Wrong Floyd

brute force, constructive algorithms, dfs and similar, graphs

Snake

bitmasks, dfs and similar, graphs, implementation

Lovely Matrix

dfs and similar, graphs, greedy, sortings

Bribes

dfs and similar, graphs, trees

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Valera and Fools

dfs and similar, dp, graphs, shortest paths

Dima and Horses

combinatorics, constructive algorithms, graphs

Hospital Queue

binary search, graphs, greedy, implementation

Network Safety

dfs and similar, dsu, graphs, math, sortings

Okabe and City

dfs and similar, graphs, shortest paths

Compressed Tree

dfs and similar, dp, graphs, greedy, sortings, trees

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Arson In Berland Forest

binary search, graphs, graphs, shortest paths

Graph Coloring

dfs and similar, graphs

Gift

dsu, graphs, sortings, trees

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs

Square Root of Permutation

combinatorics, constructive algorithms, dfs and similar, graphs, math

President and Roads

dfs and similar, graphs, hashing, shortest paths

The Maximum Subtree

dfs and similar, dp, graphs, trees

Edge Reverse

binary search, dfs and similar, graphs, trees

Node Pairs

dp, graphs, math, number theory

Railguns

brute force, dfs and similar, dp, graphs

Love Triangles

dfs and similar, dsu, graphs

Lights

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Ela and the Wiring Wizard

brute force, dp, graphs, greedy, implementation, shortest paths

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Two Houses

brute force, graphs, greedy, interactive, sortings

Between

constructive algorithms, dfs and similar, graphs, greedy

One-Way Reform

constructive algorithms, dfs and similar, flows, graphs, greedy

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Robots on a Grid

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

Water Level

brute force, graphs, greedy, implementation, math

Strictly Positive Matrix

graphs, math

Moment of Bloom

constructive algorithms, dfs and similar, graph matchings, graphs, greedy, trees

Cars

2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Count Seconds

brute force, constructive algorithms, dp, graphs, implementation, math

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Find a Number

dp, graphs, number theory, shortest paths

Andrew and Taxi

binary search, dfs and similar, graphs

Delivery Bears

binary search, flows, graphs

Super M

dfs and similar, dp, graphs, trees

Figure Fixing

constructive algorithms, dfs and similar, dsu, graphs, greedy, math

Ring Road 2

2-sat, dfs and similar, dsu, graphs

Tourism

dfs and similar, dp, dsu, graphs, greedy, trees

Three States

dfs and similar, graphs, shortest paths

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Trips

graphs

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Infinite Path

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

Almost Acyclic Graph

dfs and similar, graphs

To Go Or Not To Go?

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

Strange Housing

constructive algorithms, dfs and similar, graph matchings, graphs, greedy

A Simple Task

bitmasks, dp, graphs

Discrete Centrifugal Jumps

data structures, dp, graphs

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Tree Requests

binary search, bitmasks, constructive algorithms, dfs and similar, graphs, trees

Road Problem

graphs

Game with Points

dp, graphs, implementation, shortest paths

Ivan the Fool VS Gorynych the Dragon

dp, games, graphs

Fools and Foolproof Roads

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

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Valera and Swaps

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

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

New Roads

constructive algorithms, graphs, trees

Counter Attack

data structures, dsu, graphs, hashing, sortings

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Cactus

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

Little Girl and Problem on Trees

data structures, graphs, trees

Presents in Bankopolis

dp, graphs, shortest paths

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

Flawed Flow

constructive algorithms, flows, graphs, greedy

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Greg and Friends

combinatorics, dp, graphs, shortest paths

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Is It Flower?

dfs and similar, graphs, implementation

Dispute

dfs and similar, graphs, greedy

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

National Property

2-sat, dfs and similar, graphs, implementation

Fishes

data structures, graphs, greedy, probabilities, shortest paths

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

Information Graph

dfs and similar, dsu, graphs, trees

Yaroslav and Time

binary search, graphs, shortest paths

Ralph and Mushrooms

dp, graphs

Autosynthesis

constructive algorithms, dfs and similar, graphs, greedy, sortings

Turtle Mission: Robot and the Earthquake

dfs and similar, dp, graphs, shortest paths

Leha and another game about graph

constructive algorithms, data structures, dfs and similar, dp, graphs