Hossam and (sub-)palindromic tree

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

Breaking Good

dfs and similar, dp, graphs, shortest paths

Learning to Paint

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

Counting Shortcuts

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

Unstable String Sort

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

Red-Black Number

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

Underground Lab

constructive algorithms, dfs and similar, graphs

Weird journey

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

Leha and another game about graph

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

Staircases

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

Turtle Mission: Robot and the Earthquake

dfs and similar, dp, graphs, shortest paths

Autosynthesis

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

Information Graph

dfs and similar, dsu, graphs, trees

Apple Tree

dfs and similar, number theory, trees

National Property

2-sat, dfs and similar, graphs, implementation

Dispute

dfs and similar, graphs, greedy

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Broken BST

data structures, dfs and similar

Is It Flower?

dfs and similar, graphs, implementation

Permutation recovery

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

Light Bulbs (Easy Version)

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

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Cactus

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

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Caisa and Tree

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

Frog Jumping

dfs and similar, math, number theory

World Eater Brothers

dfs and similar, dp, greedy, trees

Bulmart

binary search, dfs and similar

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Fools and Foolproof Roads

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

Diverging Directions

data structures, dfs and similar, trees

Graph

*special problem, binary search, dfs and similar, dp, math, ternary search

The Light Square

2-sat, dfs and similar, greedy

Mushroom Strife

brute force, dfs and similar

Xenia and Dominoes

bitmasks, dfs and similar, dp

Battleship

*special problem, dfs and similar, implementation

Tree Requests

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

Compatible Numbers

bitmasks, brute force, dfs and similar, dp

0-1-Tree

dfs and similar, divide and conquer, dp, dsu, trees

Strange Housing

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

To Go Or Not To Go?

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

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

Almost Acyclic Graph

dfs and similar, graphs

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Infinite Path

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

Tree Master

brute force, data structures, dfs and similar, trees

Three States

dfs and similar, graphs, shortest paths

Persistent Bookcase

bitmasks, data structures, dfs and similar, implementation

Tourism

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

Sum Over Zero

data structures, dfs and similar, dp

Mr. Kitayuta's Technology

dfs and similar

Ring Road 2

2-sat, dfs and similar, dsu, graphs

Figure Fixing

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

Super M

dfs and similar, dp, graphs, trees

Andrew and Taxi

binary search, dfs and similar, graphs

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Weights Division (hard version)

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

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

Tree Queries (Easy Version)

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

Ants in Leaves

dfs and similar, greedy, sortings, trees

Robots on a Grid

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

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Symmetree

dfs and similar, hashing, implementation, trees

Short Colorful Strip

combinatorics, dfs and similar, dp

One-Way Reform

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

Between

constructive algorithms, dfs and similar, graphs, greedy

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Prefix Function Queries

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

Equidistant Vertices

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

Tests for problem D

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

Lights

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

Love Triangles

dfs and similar, dsu, graphs

Railguns

brute force, dfs and similar, dp, graphs

The Maximum Subtree

dfs and similar, dp, graphs, trees

Hamiltonian Spanning Tree

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

Edge Reverse

binary search, dfs and similar, graphs, trees

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

President and Roads

dfs and similar, graphs, hashing, shortest paths

Ice cream coloring

constructive algorithms, dfs and similar, greedy

Square Root of Permutation

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

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs

Treeland Tour

data structures, dfs and similar, dp, trees

Demiurges Play Again

dfs and similar, dp, math, trees

AND-MEX Walk

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

Vlad and Avoiding X

bitmasks, brute force, dfs and similar, dp, implementation

Graph Coloring

dfs and similar, graphs

Divisors

brute force, dfs and similar, implementation, number theory

Kirill and Company

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

Compressed Tree

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

Okabe and City

dfs and similar, graphs, shortest paths

Network Safety

dfs and similar, dsu, graphs, math, sortings

Three Pieces

dfs and similar, dp, shortest paths

Tree Folding

dfs and similar, dp, greedy, implementation, trees

Hill Climbing

dfs and similar, geometry, trees

Valera and Fools

dfs and similar, dp, graphs, shortest paths