Unusual Graph

*special problem, graphs

Road Repair in Treeland

*special problem, binary search, dp, trees

King's Path

*special problem, math, trees

Mateusz and Escape Room

dp

Marek and Matching (hard version)

brute force, probabilities

Marek and Matching (easy version)

brute force, probabilities

Wojtek and Card Tricks

math

Konrad and Company Evaluation

graphs

Moving Walkways

data structures, greedy, math

Into Blocks (hard version)

data structures

Koala and Notebook

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

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Red Blue Tree

data structures, implementation, trees

Polygons

greedy, math, number theory

Bits And Pieces

bitmasks, dfs and similar, dp, greedy

Indie Album

data structures, dfs and similar, hashing, string suffix structures, strings, trees

Beauty of a Permutation

constructive algorithms, math

Expected Value Again

combinatorics, strings

Almost All

constructive algorithms, trees

Palindromic Paths

implementation, interactive

You Are Given Some Letters...

binary search, implementation, math

You Are Given Some Strings...

brute force, string suffix structures, strings

Knightmare (hard)

graphs, interactive, shortest paths

Knightmare (easy)

graphs, interactive, shortest paths

GCD Groups 2

greedy, number theory, probabilities

Rectangle Painting 2

flows, graph matchings, graphs

Coloring Game

dp, games, matrices

Geometers Anonymous Club

data structures, geometry, math, sortings

Another Meme Problem

dp

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Tokitsukaze and Powers

number theory, probabilities

Tokitsukaze and Explosion

binary search, greedy

Problem from Red Panda

combinatorics

Make Equal

dp

Array Beauty

dp

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Gang Up

flows, graphs

Expected Square Beauty

dp, math, probabilities

Subarray Sorting

data structures, sortings

Vus the Cossack and a Graph

dfs and similar, graphs, greedy, implementation

Vus the Cossack and a Field

divide and conquer, implementation, math

Playlist for Polycarp (hard version)

combinatorics, dp

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Parallel Universes (Hard)

math, matrices

Heidi and the Turing Test (Hard)

The Doctor Meets Vader (Hard)

flows, shortest paths

Heidi Learns Hashing (Hard)

fft, math, number theory

Maximum Sine

binary search, data structures, number theory

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

A Story of One Country (Hard)

brute force, greedy, sortings

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Alesya and Discrete Math

divide and conquer, interactive

Fedor Runs for President

data structures, dp, trees

Stock Exchange

binary search, flows, graphs

The Awesomest Vertex

data structures, dfs and similar

Long Colorful Strip

dp

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Ehab and the Expected GCD Problem

combinatorics, dp, math, number theory

Nauuo and Bug

data structures

Nauuo and ODT

data structures

Nauuo and Portals

constructive algorithms

Nauuo and Pictures (hard version)

dp, probabilities

Xor Permutations

constructive algorithms, math

Anagram Paths

dp, implementation, trees

Low Budget Inception

brute force, geometry

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Indecisive Taxi Fee

data structures, graphs, shortest paths

Magical Permutation

bitmasks, brute force, constructive algorithms, data structures, graphs, math

Density of subarrays

dp, math

Strange device

binary search, interactive, math, trees

Winding polygonal line

constructive algorithms, geometry, greedy, math

Optimizer

graphs, greedy, hashing, implementation

Delivery Oligopoly

brute force, dp, graphs

Serval and Bonus Problem

combinatorics, dp, math, probabilities

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Neko and Flashback

constructive algorithms, dfs and similar, graphs

Election Promises

games, graphs

Abandoning Roads

brute force, dp, graphs, greedy

Tree Generator™

data structures, implementation, trees

Holy Diver

data structures

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Foo Fighters

bitmasks, constructive algorithms

Zigzag Game

games, interactive

Rainbow Coins

interactive

Palindrome XOR

dfs and similar, graphs

Satanic Panic

dp, geometry

Zoning Restrictions

dp, flows, graphs

Leaf Partition

dp, trees

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Two Merged Sequences

dp, greedy

Pink Floyd

graphs, interactive

Foreigner

dp

U2

geometry

Double Tree

data structures, divide and conquer, shortest paths, trees

Extending Set of Points

data structures, divide and conquer, dsu

Dish Shopping

data structures, divide and conquer

Maximize Mex

flows, graph matchings, graphs