Tourist Reform

dfs and similar, graphs

Copy of a Copy of a Copy

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

Block Tower

constructive algorithms, dfs and similar, graphs

Count Seconds

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

Envy

data structures, dsu, graphs

AND Graph

bitmasks, dfs and similar, dsu, graphs

Case of Computer Network

dfs and similar, graphs, trees

Privatization of Roads in Treeland

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

Turtle Mission: Robot and the Earthquake

dfs and similar, dp, graphs, shortest paths

Cars

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

Moment of Bloom

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

Ralph and Mushrooms

dp, graphs

Subordinates

constructive algorithms, data structures, graphs, greedy, sortings

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

Autosynthesis

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

Infinite Maze

dfs and similar, graphs

Tourists

data structures, dfs and similar, graphs, trees

Instant Noodles

graphs, hashing, math, number theory

Yaroslav and Time

binary search, graphs, shortest paths

Cycle In Maze

*special problem, dfs and similar, graphs, greedy, shortest paths

Roma and Poker

dp, graphs

Strictly Positive Matrix

graphs, math

World Tour

graphs, shortest paths

Water Level

brute force, graphs, greedy, implementation, math

Information Graph

dfs and similar, dsu, graphs, trees

Partial Teacher

dp, graphs, greedy, implementation

The way home

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

Subset with Zero Sum

constructive algorithms, dfs and similar, graphs, math

Mr. Kitayuta's Colorful Graph

brute force, dfs and similar, dsu, graphs

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

The Great Mixing

dfs and similar, graphs, shortest paths

Arithmetic Operations

brute force, data structures, graphs, math

Coprocessor

dfs and similar, dp, graphs, greedy

Data Center Maintenance

dfs and similar, graphs

Robots on a Grid

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

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Ski Accidents

constructive algorithms, graphs, greedy

Fishes

data structures, graphs, greedy, probabilities, shortest paths

Petya and Graph

flows, graphs

National Property

2-sat, dfs and similar, graphs, implementation

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

3-cycles

constructive algorithms, graphs, greedy

Dasha and Puzzle

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

Robot on the Board 2

brute force, dfs and similar, graphs, implementation

One-Way Reform

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

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Catowice City

2-sat, dfs and similar, graph matchings, graphs

Lost Array

graphs, greedy, interactive, shortest paths

Between

constructive algorithms, dfs and similar, graphs, greedy

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Two Houses

brute force, graphs, greedy, interactive, sortings

Graph and Queries

data structures, dsu, graphs, implementation, trees

Theseus and labyrinth

graphs, implementation, shortest paths

Ela and the Wiring Wizard

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

Dispute

dfs and similar, graphs, greedy

Data Center Drama

dfs and similar, graphs

Ehab's REAL Number Theory Problem

brute force, dfs and similar, graphs, number theory, shortest paths

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Police Station

dp, graphs, shortest paths

Valuable Paper

binary search, flows, graph matchings, graphs

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

Number of Groups

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

Lights

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

Love Triangles

dfs and similar, dsu, graphs

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

Restoration of string

constructive algorithms, graphs, implementation

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

Is It Flower?

dfs and similar, graphs, implementation

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Permutation recovery

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

Railguns

brute force, dfs and similar, dp, graphs

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Node Pairs

dp, graphs, math, number theory

The Maximum Subtree

dfs and similar, dp, graphs, trees

Edge Reverse

binary search, dfs and similar, graphs, trees

Great Grids

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

Phoenix and Earthquake

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

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Light Bulbs (Easy Version)

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

Greg and Friends

combinatorics, dp, graphs, shortest paths

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Quantifier Question

dfs and similar, dp, graphs, math

Maximize Mex

flows, graph matchings, graphs

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

Arthur and Walls

constructive algorithms, data structures, graphs, greedy, shortest paths

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

President and Roads

dfs and similar, graphs, hashing, shortest paths

Egor in the Republic of Dagestan

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

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

Flawed Flow

constructive algorithms, flows, graphs, greedy

Triangles

combinatorics, graphs, math