Phoenix and Earthquake

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

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Great Grids

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

Edge Reverse

binary search, dfs and similar, graphs, trees

The Maximum Subtree

dfs and similar, dp, graphs, trees

Hamiltonian Spanning Tree

dfs and similar, dp, graph matchings, greedy, trees

Game

dfs and similar, greedy

Towers

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

Railguns

brute force, dfs and similar, dp, graphs

Permutation recovery

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

Company

binary search, data structures, dfs and similar, greedy, trees

Is It Flower?

dfs and similar, graphs, implementation

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

Tree Compass

constructive algorithms, dfs and similar, greedy, trees

Love Triangles

dfs and similar, dsu, graphs

Lights

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

Tests for problem D

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

Equidistant Vertices

brute force, combinatorics, dfs and similar, dp, trees

Number of Groups

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

Broken BST

data structures, dfs and similar

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

Inversions problem

brute force, dfs and similar, dp, meet-in-the-middle

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Giving Awards

dfs and similar

Ehab's REAL Number Theory Problem

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

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Data Center Drama

dfs and similar, graphs

Prefix Function Queries

dfs and similar, dp, hashing, string suffix structures, strings, trees

Dispute

dfs and similar, graphs, greedy

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Between

constructive algorithms, dfs and similar, graphs, greedy

Catowice City

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

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

One-Way Reform

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

Robot on the Board 2

brute force, dfs and similar, graphs, implementation

Dasha and Puzzle

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

Short Colorful Strip

combinatorics, dfs and similar, dp

Pairs of Numbers

brute force, dfs and similar, math, number theory

National Property

2-sat, dfs and similar, graphs, implementation

Tree Queries (Hard Version)

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

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Symmetree

dfs and similar, hashing, implementation, trees

Making Genome in Berland

*special problem, dfs and similar, strings

Comments

dfs and similar, expression parsing, implementation, strings

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Robots on a Grid

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

Dog Snacks

binary search, dfs and similar, dp, greedy, trees

Ants in Leaves

dfs and similar, greedy, sortings, trees

Data Center Maintenance

dfs and similar, graphs

Coprocessor

dfs and similar, dp, graphs, greedy

The Great Mixing

dfs and similar, graphs, shortest paths

DeadLee

data structures, dfs and similar, greedy, implementation, sortings

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

Mr. Kitayuta's Colorful Graph

brute force, dfs and similar, dsu, graphs

Subset with Zero Sum

constructive algorithms, dfs and similar, graphs, math

Apple Tree

dfs and similar, number theory, trees

Fib-tree

brute force, dfs and similar, divide and conquer, number theory, trees

Information Graph

dfs and similar, dsu, graphs, trees

Chocolate

brute force, dfs and similar, math, meet-in-the-middle, number theory

Tree Queries (Easy Version)

brute force, constructive algorithms, dfs and similar, dp, greedy, trees

Happy Life in University

data structures, dfs and similar, greedy, trees

Bits And Pieces

bitmasks, dfs and similar, dp, greedy

Cycle In Maze

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

Tourists

data structures, dfs and similar, graphs, trees

Infinite Maze

dfs and similar, graphs

An overnight dance in discotheque

dfs and similar, dp, geometry, greedy, trees

Autosynthesis

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

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

Hemose in ICPC ?

binary search, dfs and similar, implementation, interactive, math, number theory, trees

Moment of Bloom

constructive algorithms, dfs and similar, graph matchings, 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

Privatization of Roads in Treeland

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

AND Graph

bitmasks, dfs and similar, dsu, graphs

Case of Computer Network

dfs and similar, graphs, trees

Weights Division (hard version)

binary search, dfs and similar, greedy, sortings, trees, two pointers

Block Tower

constructive algorithms, dfs and similar, graphs

Copy of a Copy of a Copy

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

Tourist Reform

dfs and similar, graphs

Staircases

brute force, combinatorics, data structures, dfs and similar, dp, implementation, math

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Leha and another game about graph

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

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Bitwise Formula

bitmasks, brute force, dfs and similar, expression parsing, implementation

Unusual Minesweeper

binary search, dfs and similar, dsu, greedy, sortings

Weird journey

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

Andrew and Taxi

binary search, dfs and similar, graphs

Underground Lab

constructive algorithms, dfs and similar, graphs

Ant on the Tree

constructive algorithms, dfs and similar, trees

Work Group

dfs and similar, dp, graphs, strings, trees

Berzerk

dfs and similar, dp, games

Connected Components

data structures, dfs and similar, dp, dsu

Red-Black Number

dfs and similar, dp, implementation, math, meet-in-the-middle

Unstable String Sort

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

Counting Shortcuts

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