Souvenirs

data structures

Welcome home, Chtholly

data structures, dsu

Mission Possible

Unusual Graph

*special problem, graphs

Two Railroads

*special problem

The Hero with Bombs

*special problem

Nastya and Bees

graphs, interactive, probabilities

Algoland and Berland

constructive algorithms, divide and conquer, geometry

Gnomes of Might and Magic

data structures, graphs, implementation, shortest paths

Guarding warehouses

data structures, geometry

Spider

geometry, graphs

Help Greg the Dwarf 2

geometry

Flow Optimality

constructive algorithms, flows, math

Alpha planetary system

constructive algorithms, graphs, shortest paths

Martian Colony

geometry

Lookup Tables

bitmasks

To Play or not to Play

greedy

Soap Time! - 2

binary search, data structures

PermutationForces

data structures, greedy

Knightmare (hard)

graphs, interactive, shortest paths

Bob and stages

dp, geometry

Circle of Numbers

math

Attraction Score

Decent Division

constructive algorithms, data structures

Cyclic Sum

data structures, fft, number theory

Mrs. Hudson's Pancakes

brute force, dp

Cursed Game

interactive

Conference Problem

dp

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Escaping on Beaveractor

data structures, implementation, trees

Tree and Table

dfs and similar, dp, implementation, trees

Drawing Circles is Fun

combinatorics, geometry

Matrix

data structures

Weird LCM Operations

brute force, constructive algorithms, number theory

Tree and Permutation Game

dfs and similar, games, graphs, trees

Little Artem and 2-SAT

Privatization

flows, graphs

Planar Graph

flows, geometry, graphs

Wizards and Roads

data structures, divide and conquer, graph matchings, graphs, greedy

Sequence Transformation

brute force, data structures, dp, implementation, math

Landmarks

data structures, dp

Palindromic Hamiltonian Path

brute force, dfs and similar, dp, graphs, hashing

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

1 2 3 4 ...

dp, math, matrices

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Doodle Jump

math, number theory

Chess

math, shortest paths

Median Queries

constructive algorithms, interactive, probabilities

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

A Story of One Country (Hard)

brute force, greedy, sortings

Chain Reaction

brute force, geometry

Weak Subsequence

combinatorics

Jellyfish and Hack

dp, math

Polygon

binary search, dp, geometry

Maximum Flow

flows, graphs

Stuck Conveyor

binary search, constructive algorithms, interactive

Selling Numbers

dp, sortings

Mirror Room

data structures, implementation

The Game of the Century

constructive algorithms, graphs, shortest paths

Reindeer Games

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

Random Ranking

dp, math, probabilities

Blog Post Rating

data structures, sortings

Pumping Lemma

hashing, strings

The Thorny Path

greedy, math

Rainbow Coins

interactive

Circular Xor Reversal

bitmasks, constructive algorithms

World of Tank

dp, greedy

Find String in a Grid

data structures, dp, strings, trees

Li Hua and Path

data structures, dfs and similar, divide and conquer, dsu, trees

Lasers and Mirrors

constructive algorithms, math

Anagram Paths

dp, implementation, trees

Parmigiana With Seafood

binary search, dp, greedy, trees

Berland Miners

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

Mystic Carvings

data structures

Equal Product

data structures, math, number theory, two pointers

Finding lines

constructive algorithms, divide and conquer, interactive

Appleman and a Game

binary search, shortest paths, strings

Banners

brute force, data structures, dp

Tower Defense

binary search, brute force, data structures

A Stroll Around the Matrix

data structures, greedy, math

Game Bundles

brute force, constructive algorithms, dp, greedy, math

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Colorful Tree Again

brute force, data structures, trees

Roadside Trees

data structures, dp

Red and Black Tree

dp, implementation, math

Omkar and Time Travel

data structures, math

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Guess two numbers

binary search, interactive

The Awesomest Vertex

data structures, dfs and similar

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

Edge Queries

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

Candies Game

constructive algorithms, greedy

Yet Another Partiton Problem

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

Coprime Permutation

combinatorics, number theory

Gasoline prices

data structures, divide and conquer, dsu, hashing, trees

Down Below

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

String Distance

binary search, brute force, data structures, hashing, implementation, strings

Bear and Rectangle Strips

dp, greedy

Bear and Cavalry

data structures, divide and conquer, dp