Queue at the School

constructive algorithms, graph matchings, implementation, shortest paths

Shortest path of the king

greedy, shortest paths

Thermostat

greedy, math, shortest paths

2D Traveling

geometry, math, shortest paths, sortings

Rook, Bishop and King

graphs, math, shortest paths

Polygon

dp, graphs, implementation, shortest paths

Getting Zero

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

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths

Two Buttons

dfs and similar, graphs, greedy, implementation, math, shortest paths

Great Graphs

constructive algorithms, graphs, greedy, shortest paths, sortings

Jumping on Walls

shortest paths

Mortal Kombat Tower

dp, graphs, greedy, shortest paths

Eastern Exhibition

binary search, geometry, shortest paths, sortings

Lunar New Year and a Wander

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

Air Conditioners

data structures, dp, implementation, shortest paths, sortings, two pointers

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Fire Again

brute force, dfs and similar, shortest paths

Biridian Forest

dfs and similar, shortest paths

Hierarchy

dfs and similar, dsu, greedy, shortest paths

Minimal Height Tree

graphs, greedy, shortest paths, trees

The Two Routes

graphs, shortest paths

Round Dance

dfs and similar, dsu, graphs, shortest paths

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Fair

graphs, greedy, number theory, shortest paths

Fight Against Traffic

dfs and similar, graphs, shortest paths

Mike and Shortcuts

dfs and similar, graphs, greedy, shortest paths

Jamie and Interesting Graph

constructive algorithms, graphs, shortest paths

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

Text Editor

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

Solve The Maze

constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, shortest paths

Valid BFS?

dfs and similar, graphs, shortest paths, trees

Greg and Graph

dp, graphs, shortest paths

Igor In the Museum

dfs and similar, graphs, shortest paths

Cover it!

dfs and similar, dsu, graphs, shortest paths, trees

Zero Path

brute force, data structures, dp, graphs, greedy, shortest paths

Required Length

brute force, dfs and similar, dp, hashing, shortest paths

By Elevator or Stairs?

dp, shortest paths

Xenia and Weights

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

Escape The Maze (easy version)

dfs and similar, greedy, shortest paths, trees, two pointers

Mad City

dfs and similar, dsu, games, graphs, shortest paths, trees

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

Minimum Maximum Distance

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

Navigation System

dfs and similar, graphs, shortest paths

Array Stabilization (AND version)

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

You Are Given a Decimal String...

brute force, dp, shortest paths

Planets

binary search, data structures, graphs, shortest paths

Phillip and Trains

dfs and similar, graphs, shortest paths

Cycle In Maze

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

King's Path

dfs and similar, graphs, hashing, shortest paths

Christmas Trees

graphs, greedy, shortest paths

Explorer Space

dp, graphs, shortest paths

Labyrinth

graphs, shortest paths

Eternal Victory

dfs and similar, graphs, greedy, shortest paths, trees

Friendly Spiders

dfs and similar, graphs, math, number theory, shortest paths

Bicycles

graphs, greedy, implementation, shortest paths, sortings

Edge Deletion

graphs, greedy, shortest paths

String Problem

shortest paths

Maximum Distance

dsu, graphs, shortest paths, sortings

Chamber of Secrets

dfs and similar, shortest paths

Moving Both Hands

dp, graphs, shortest paths

Multihedgehog

dfs and similar, graphs, shortest paths

AlgoRace

dp, shortest paths

Cakewalk

*special problem, greedy, implementation, shortest paths

Dijkstra?

graphs, shortest paths

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Shortest Cycle

bitmasks, brute force, graphs, shortest paths

Cow and Fields

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

Roads in Berland

graphs, shortest paths

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Permutation Graph

binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Nearest Excluded Points

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

Frog Traveler

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

Two Paths

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

Rudolf and CodeVid-23

bitmasks, dp, graphs, greedy, shortest paths

Hexagons

brute force, constructive algorithms, greedy, implementation, math, shortest paths

Lena and Matrix

data structures, dp, geometry, shortest paths

Kilani and the Game

dfs and similar, graphs, implementation, shortest paths

Amr and Chemistry

brute force, graphs, greedy, math, shortest paths

Missile Silos

data structures, dfs and similar, graphs, shortest paths

Playlist

data structures, dsu, implementation, shortest paths

Escape The Maze (hard version)

dfs and similar, dp, greedy, shortest paths, trees

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Innokenty and a Football League

2-sat, graphs, greedy, implementation, shortest paths, strings

Time Travel

binary search, graphs, shortest paths

Volleyball

shortest paths

Police Station

dp, graphs, shortest paths

Jzzhu and Cities

graphs, greedy, shortest paths

Buy a Ticket

data structures, graphs, shortest paths

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Paths and Trees

graphs, greedy, shortest paths

Empty Graph

binary search, constructive algorithms, data structures, greedy, shortest paths

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Shortest Path

graphs, shortest paths

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Dima and Bacteria

dsu, graphs, shortest paths

World Tour

graphs, shortest paths