Police Stations

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

Hide and Seek

graphs

Buy a Ticket

data structures, graphs, shortest paths

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

Restore Graph

dfs and similar, graphs, sortings

Crazy Robot

dfs and similar, graphs

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Jamie and Interesting Graph

constructive algorithms, graphs, shortest paths

Binary Table (Hard Version)

constructive algorithms, graphs, greedy, implementation

Omsk Metro (simple version)

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

Coloring Edges

constructive algorithms, dfs and similar, graphs

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Dorm Water Supply

dfs and similar, graphs

2+ doors

2-sat, bitmasks, graphs, greedy

Edge Deletion

graphs, greedy, shortest paths

Longtail Hedgehog

dp, graphs

Reset K Edges

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

Road Map

dfs and similar, graphs

Weights Distributing

brute force, graphs, greedy, shortest paths, sortings

Nearest Excluded Points

binary search, data structures, dfs and similar, graphs, shortest paths

The Door Problem

2-sat, dfs and similar, dsu, graphs

Frog Traveler

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

Ring road

graphs

Two Fairs

combinatorics, dfs and similar, dsu, graphs

Football

constructive algorithms, graphs, implementation

Discrete Centrifugal Jumps

data structures, dp, graphs

Array Stabilization (AND version)

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

Toss a Coin to Your Graph...

binary search, dfs and similar, dp, graphs

Mail Stamps

data structures, dfs and similar, graphs, implementation

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Subway

dfs and similar, graphs

Friends

graphs, implementation, math

Planets

binary search, data structures, graphs, shortest paths

Alyona and a tree

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

A Simple Task

bitmasks, dp, graphs

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

Numbers on Tree

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

pSort

dfs and similar, dsu, graphs

Paths and Trees

graphs, greedy, shortest paths

Graph and String

constructive algorithms, graphs

Cheap Dinner

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

Directed Roads

combinatorics, dfs and similar, graphs, math

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

The Strongest Build

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

Two Paths

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

Send the Fool Further! (easy)

dfs and similar, graphs, trees

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Imbalanced Arrays

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

Reducing Delivery Cost

brute force, graphs, shortest paths

Cut

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

Obsession with Robots

constructive algorithms, graphs, implementation

Counting Graphs

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

Ehab's Last Corollary

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

Rudolf and CodeVid-23

bitmasks, dp, graphs, greedy, shortest paths

Kilani and the Game

dfs and similar, graphs, implementation, shortest paths

Quantity of Strings

combinatorics, dfs and similar, graphs, math

Garland

dfs and similar, graphs, greedy, trees

Olya and Energy Drinks

data structures, dfs and similar, graphs, shortest paths

Amr and Chemistry

brute force, graphs, greedy, math, shortest paths

We Need More Bosses

dfs and similar, graphs, trees

Tenzing and His Animal Friends

constructive algorithms, graphs, greedy

Maximum Distance

dsu, graphs, shortest paths, sortings

Road Reform

dsu, graphs, greedy

Fun with Integers

dfs and similar, graphs, implementation, math

Destroying Roads

constructive algorithms, graphs, shortest paths

Cutting Figure

constructive algorithms, graphs, trees

Fish Graph

brute force, constructive algorithms, dfs and similar, graphs

Connecting Universities

dfs and similar, dp, graphs, trees

Missile Silos

data structures, dfs and similar, graphs, shortest paths

Graph And Its Complement

constructive algorithms, graphs, implementation

Time to Run

constructive algorithms, graphs, implementation

Segment Tree

data structures, dsu, graphs, trees

Microcycle

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

A Mist of Florescence

constructive algorithms, graphs

Koxia and Game

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

Chemical table

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

Challenges in school №41

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

Cow Program

dfs and similar, dp, graphs

Misha, Grisha and Underground

dfs and similar, graphs, trees

Brain Network (medium)

dfs and similar, graphs, trees

Strange Housing

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

Maximum Diameter Graph

constructive algorithms, graphs, implementation

Edge Split

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

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

PFAST Inc.

bitmasks, brute force, graphs

Phillip and Trains

dfs and similar, graphs, shortest paths

MADMAX

dfs and similar, dp, games, graphs

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

To Go Or Not To Go?

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

Soldier and Traveling

flows, graphs, math

Ilya And The Tree

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

Decreasing Debts

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

Tokitsukaze and Two Colorful Tapes

constructive algorithms, dfs and similar, graphs, greedy

Lazy Student

constructive algorithms, data structures, graphs

Tree Diameter

bitmasks, graphs, interactive

Permutation Addicts

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

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Minimum Path

graphs, shortest paths