Resort

graphs

Graph Coloring

dfs and similar, dp, graphs

New Year Santa Network

combinatorics, dfs and similar, graphs, trees

Tanya and Password

dfs and similar, graphs

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Spanning Tree with One Fixed Degree

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

Shortest Path

graphs, shortest paths

Colored Rooks

constructive algorithms, graphs

Count Paths

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

Bear and Two Paths

constructive algorithms, graphs

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Party

constructive algorithms, graphs, math

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Train Splitting

constructive algorithms, graphs, greedy

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Regular Bridge

constructive algorithms, graphs, implementation

Cycle in Graph

dfs and similar, graphs

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

Mahmoud and a Dictionary

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

Almost Acyclic Graph

dfs and similar, graphs

Minimum Path

graphs, shortest paths

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Permutation Addicts

constructive algorithms, data structures, dfs and similar, dsu, graphs, trees

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

Lazy Student

constructive algorithms, data structures, graphs

Tokitsukaze and Two Colorful Tapes

constructive algorithms, dfs and similar, graphs, greedy

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Ilya And The Tree

dfs and similar, graphs, math, number theory, trees

Soldier and Traveling

flows, graphs, math

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

MADMAX

dfs and similar, dp, games, graphs

Phillip and Trains

dfs and similar, graphs, shortest paths

To Go Or Not To Go?

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

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

PFAST Inc.

bitmasks, brute force, graphs

Tree Diameter

bitmasks, graphs, interactive

Edge Split

brute force, constructive algorithms, dfs and similar, dsu, graphs, probabilities, trees

Maximum Diameter Graph

constructive algorithms, graphs, implementation

Brain Network (medium)

dfs and similar, graphs, trees

Strange Housing

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

Misha, Grisha and Underground

dfs and similar, graphs, trees

Cow Program

dfs and similar, dp, graphs

Challenges in school №41

brute force, constructive algorithms, games, graphs, greedy, implementation, sortings

Chemical table

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

A Mist of Florescence

constructive algorithms, graphs

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Segment Tree

data structures, dsu, graphs, trees

Microcycle

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

Graph And Its Complement

constructive algorithms, graphs, implementation

Connecting Universities

dfs and similar, dp, graphs, trees

Missile Silos

data structures, dfs and similar, graphs, shortest paths

Time to Run

constructive algorithms, graphs, implementation

Destroying Roads

constructive algorithms, graphs, shortest paths

Cutting Figure

constructive algorithms, graphs, trees

Fish Graph

brute force, constructive algorithms, dfs and similar, graphs

Fun with Integers

dfs and similar, graphs, implementation, math

Maximum Distance

dsu, graphs, shortest paths, sortings

Road Reform

dsu, graphs, greedy

We Need More Bosses

dfs and similar, graphs, trees

Tenzing and His Animal Friends

constructive algorithms, graphs, greedy

Amr and Chemistry

brute force, graphs, greedy, math, shortest paths

Olya and Energy Drinks

data structures, dfs and similar, graphs, shortest paths

Quantity of Strings

combinatorics, dfs and similar, graphs, math

Garland

dfs and similar, graphs, greedy, trees

Kilani and the Game

dfs and similar, graphs, implementation, shortest paths

Ehab's Last Corollary

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

Rudolf and CodeVid-23

bitmasks, dp, graphs, greedy, shortest paths

Counting Graphs

combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees

Obsession with Robots

constructive algorithms, graphs, implementation

Cut

binary search, data structures, dp, graphs, number theory, two pointers

Reducing Delivery Cost

brute force, graphs, shortest paths

Imbalanced Arrays

constructive algorithms, graphs, greedy, math, sortings, two pointers

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

Send the Fool Further! (easy)

dfs and similar, graphs, trees

Two Paths

dfs and similar, dp, graphs, shortest paths, trees, two pointers

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

Directed Roads

combinatorics, dfs and similar, graphs, math

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Graph and String

constructive algorithms, graphs

Cheap Dinner

brute force, data structures, graphs, greedy, implementation, sortings, two pointers

Numbers on Tree

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

Paths and Trees

graphs, greedy, shortest paths

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

pSort

dfs and similar, dsu, graphs

Alyona and a tree

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

A Simple Task

bitmasks, dp, graphs

Planets

binary search, data structures, graphs, shortest paths

Friends

graphs, implementation, math

Subway

dfs and similar, graphs

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Mail Stamps

data structures, dfs and similar, graphs, implementation

Toss a Coin to Your Graph...

binary search, dfs and similar, dp, graphs

Array Stabilization (AND version)

brute force, graphs, math, number theory, shortest paths

Football

constructive algorithms, graphs, implementation

Discrete Centrifugal Jumps

data structures, dp, graphs

Two Fairs

combinatorics, dfs and similar, dsu, graphs