Colored Portals

binary search, brute force, data structures, graphs, greedy, implementation, shortest paths

Call During the Journey

binary search, brute force, graphs, greedy, shortest paths

Determine Winning Islands in Race

data structures, dp, graphs, greedy, shortest paths

Paint the Tree

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

Long Way to be Non-decreasing

binary search, dfs and similar, graphs, implementation, shortest paths, two pointers

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

Arrow Path

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

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Turtle Mission: Robot and the Earthquake

dfs and similar, dp, graphs, shortest paths

Moving Platforms

graphs, math, number theory, shortest paths

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Bicycles

graphs, greedy, implementation, shortest paths, sortings

Unusual Entertainment

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

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Vova Escapes the Matrix

brute force, dfs and similar, divide and conquer, shortest paths

Time Travel

binary search, graphs, shortest paths

Minimum Maximum Distance

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

Jellyfish and Math

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

Mad City

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

Another MEX Problem

bitmasks, brute force, dp, shortest paths

2D Traveling

geometry, math, shortest paths, sortings

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Teleportation in Byteland

data structures, dfs and similar, divide and conquer, graphs, shortest paths, trees

Rudolf and CodeVid-23

bitmasks, dp, graphs, greedy, shortest paths

Tenzing and Tree

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

Round Dance

dfs and similar, dsu, graphs, shortest paths

Sum Graph

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

Approximate Diameter

binary search, divide and conquer, graphs, shortest paths

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

Tokens on Graph

constructive algorithms, dfs and similar, graphs, shortest paths

Timofey and Black-White Tree

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

The Game of the Century

constructive algorithms, graphs, shortest paths

Italian Data Centers

graphs, shortest paths

Friendly Spiders

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

Infinite Chess

implementation, shortest paths

Thermostat

greedy, math, shortest paths

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Kirill and Company

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

Connectivity Addicts

constructive algorithms, dsu, graphs, greedy, interactive, shortest paths, trees

Ela and the Wiring Wizard

brute force, dp, graphs, greedy, implementation, shortest paths

Late For Work (submissions are not allowed)

data structures, greedy, schedules, shortest paths

Moving Both Hands

dp, graphs, shortest paths

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths

Empty Graph

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

Permutation Graph

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

Zero Path

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

Keshi in Search of AmShZ

graphs, greedy, shortest paths

Lena and Matrix

data structures, dp, geometry, shortest paths

Labyrinth Adventures

data structures, dp, matrices, shortest paths

Required Length

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

Job Lookup

constructive algorithms, dp, shortest paths, trees

Antennas

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

Getting Zero

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

Snowy Mountain

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

Nearest Excluded Points

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

Counting Shortcuts

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

Serious Business

data structures, divide and conquer, dp, implementation, shortest paths

Distance Tree (hard version)

binary search, dfs and similar, shortest paths, trees

Distance Tree (easy version)

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

Not Splitting

geometry, graphs, greedy, implementation, shortest paths

Not Escaping

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

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Christmas Chocolates

dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees

Reindeer Games

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

Armor and Weapons

brute force, dp, greedy, shortest paths

Escape The Maze (hard version)

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

Escape The Maze (easy version)

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

Frog Traveler

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

Shortest path

brute force, geometry, math, shortest paths

Railway Construction

brute force, constructive algorithms, data structures, graphs, shortest paths

Array Stabilization (AND version)

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

Anti-Tetris

constructive algorithms, graphs, shortest paths

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

Down Below

binary search, dfs and similar, graphs, greedy, meet-in-the-middle, shortest paths

Jumping Around

binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths

Air Conditioners

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

Great Graphs

constructive algorithms, graphs, greedy, shortest paths, sortings

Omkar and Forest

combinatorics, graphs, math, shortest paths

Lost Array

graphs, greedy, interactive, shortest paths

It's a bird! No, it's a plane! No, it's AaParsa!

constructive algorithms, graphs, shortest paths

To Go Or Not To Go?

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

Explorer Space

dp, graphs, shortest paths

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Cakewalk

*special problem, greedy, implementation, shortest paths

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers

BFS Trees

combinatorics, dfs and similar, graphs, math, shortest paths, trees

Ones

dp, greedy, shortest paths

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Eastern Exhibition

binary search, geometry, shortest paths, sortings

Useful Edges

graphs, shortest paths

Playlist

data structures, dsu, implementation, shortest paths

Minimum Path

graphs, shortest paths

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

Capitalism

constructive algorithms, dfs and similar, graphs, shortest paths

Graph Transpositions

dfs and similar, graphs, greedy, shortest paths

Minimal Height Tree

graphs, greedy, shortest paths, trees

Reducing Delivery Cost

brute force, graphs, shortest paths