Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Minimal Labels

data structures, dfs and similar, graphs, greedy

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Centroids

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

Sleepy Game

dfs and similar, dp, games, graphs

Graph Coloring

dfs and similar, dp, graphs

New Year Santa Network

combinatorics, dfs and similar, graphs, trees

Infinite Path

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

Resort

graphs

Tanya and Password

dfs and similar, graphs

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Colored Rooks

constructive algorithms, graphs

Spanning Tree with One Fixed Degree

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

Shortest Path

graphs, shortest paths

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

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Party

constructive algorithms, graphs, math

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Count Paths

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

Permutation Shift

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

Regular Bridge

constructive algorithms, graphs, implementation

Train Splitting

constructive algorithms, graphs, greedy

Cycle in Graph

dfs and similar, graphs

Mahmoud and a Dictionary

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

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

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

Lazy Student

constructive algorithms, data structures, graphs

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Decreasing Debts

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

Tokitsukaze and Two Colorful Tapes

constructive algorithms, dfs and similar, graphs, greedy

Ilya And The Tree

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

Phillip and Trains

dfs and similar, graphs, shortest paths

Soldier and Traveling

flows, graphs, math

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

MADMAX

dfs and similar, dp, games, graphs

To Go Or Not To Go?

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

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

Tree Diameter

bitmasks, graphs, interactive

PFAST Inc.

bitmasks, brute force, graphs

Maximum Diameter Graph

constructive algorithms, graphs, implementation

Edge Split

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

Shuffling Songs

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

Strange Housing

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

Brain Network (medium)

dfs and similar, graphs, trees

Cow Program

dfs and similar, dp, graphs

Misha, Grisha and Underground

dfs and similar, graphs, trees

Chemical table

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

Koxia and Game

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

Challenges in school №41

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

A Mist of Florescence

constructive algorithms, graphs

Segment Tree

data structures, dsu, graphs, 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

Microcycle

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

Destroying Roads

constructive algorithms, graphs, shortest paths

Cutting Figure

constructive algorithms, graphs, trees

Fun with Integers

dfs and similar, graphs, implementation, math

Fish Graph

brute force, constructive algorithms, dfs and similar, graphs

Maximum Distance

dsu, graphs, shortest paths, sortings

Road Reform

dsu, graphs, greedy

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

We Need More Bosses

dfs and similar, graphs, trees

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

Obsession with Robots

constructive algorithms, graphs, implementation

Counting Graphs

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

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

The Strongest Build

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

Directed Roads

combinatorics, dfs and similar, graphs, math

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

Planets

binary search, data structures, graphs, shortest paths

A Simple Task

bitmasks, dp, graphs

Friends

graphs, implementation, math

Subway

dfs and similar, graphs

Subsequences (easy version)

dp, graphs, implementation, shortest paths