Carousel of Combinations

brute force, combinatorics, dp, math, number theory

Counting Is Fun (Easy Version)

brute force, combinatorics, dp, math

Tree Quiz

Forming Groups

Pokémon Arena

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

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

XOR Break --- Game Version

bitmasks, games, greedy, interactive

2..3...4.... Wonderful! Wonderful!

combinatorics, dp, math

Fractal Origami

geometry, math, matrices

Matrix Problem

flows, graphs

Hypercatapult Commute

graphs

Great City Saint Petersburg

data structures

Sum of Digits of Sums

*special problem, binary search, data structures

Multiple Lamps

bitmasks, brute force, constructive algorithms, math, number theory

One-X

combinatorics, dfs and similar, dp, math, trees

Trees and XOR Queries Again

data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Two Permutations (Easy Version)

brute force, constructive algorithms, greedy, number theory

Interactive Game with Coloring

brute force, constructive algorithms, dfs and similar, graphs, implementation, interactive, trees

Jellyfish and Math

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

Travel Plan

combinatorics, dp, implementation, math, trees

Mighty Rock Tower

brute force, combinatorics, dp, math, probabilities

Lihmuf Balling

binary search, brute force, math

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Ina of the Mountain

data structures, dp, greedy, math

Vika and Wiki

binary search, bitmasks, combinatorics, divide and conquer, dp, math

Great Grids

2-sat, constructive algorithms, dfs and similar, dsu, graphs

Decreasing Game

constructive algorithms, dfs and similar, dp, greedy, interactive

Editorial for Two

binary search, data structures, greedy, implementation

Red-Blue Operations (Hard Version)

binary search, constructive algorithms, greedy, implementation, math

Hyperregular Bracket Strings

combinatorics, greedy, hashing, math, number theory, sortings

Range Sorting (Hard Version)

binary search, data structures, dp, greedy

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

Similar Polynomials

combinatorics, math

Two Tanks

binary search, dp, implementation, math

Routing

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

Blocking Chips

binary search, constructive algorithms, dfs and similar, greedy, trees

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Divisors and Table

brute force, dfs and similar, dp, number theory

Wooden Spoon

combinatorics, dp

Delicious Dessert

binary search, dsu, hashing, math, number theory, string suffix structures

Josuke and Complete Graph

binary search, brute force, data structures, math, number theory

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Comfortably Numb

bitmasks, data structures, divide and conquer, strings, trees

Magician and Pigs (Easy Version)

brute force, data structures, implementation

Koxia and Tree

combinatorics, dfs and similar, dp, dsu, math, probabilities, trees

Project Manager

brute force, data structures, implementation

Access Levels

bitmasks, dsu, flows, graph matchings

Doremy's Number Line

dp, greedy, sortings

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

Bracket Cost

binary search, data structures, divide and conquer, dp, greedy, strings

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

FTL

binary search, dp

Cleaning Robot

bitmasks, dp

Connectivity Addicts

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

Good Subarrays (Hard Version)

binary search, data structures, dp, two pointers

House Planning

constructive algorithms, data structures, graph matchings, greedy

Balance (Hard version)

brute force, data structures, number theory

Almost Perfect

combinatorics, fft, math

Lemper Cooking Competition

data structures

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Tonya and Burenka-179

data structures, greedy, math, number theory

Long Way Home

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

Cross Swapping

2-sat, data structures, dsu, greedy, matrices

Two Arrays

binary search, games, graph matchings

XOR Tree

bitmasks, data structures, dfs and similar, dsu, greedy, trees

DFS Trees

dfs and similar, dsu, graphs, greedy, sortings, trees

Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

Coloring

brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math

Dog Walking

brute force, greedy, math

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

Anti-Theft Road Planning

bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math

Jee, You See?

bitmasks, combinatorics, dp

Half Queen Cover

constructive algorithms, math

Colorful Operations

brute force, data structures, implementation

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Distance Tree (easy version)

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

Flipping Range

constructive algorithms, dp, greedy, number theory

Game on Sum (Hard Version)

combinatorics, dp, games, math

Black and White Tree

dfs and similar, greedy, trees

Subsequences Galore

bitmasks, combinatorics, dp

Permutation and Queries

brute force, data structures, divide and conquer, two pointers

Too Many Impostors (hard version)

constructive algorithms, implementation, interactive, math

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

William The Oblivious

bitmasks, data structures, dp, matrices

Dominoes

combinatorics, fft, graphs, math, number theory

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

Array Equalizer

binary search, greedy, implementation, math, number theory, sortings, two pointers

RBS

binary search, bitmasks, brute force, data structures, dp

Ideal Farm

constructive algorithms, math

Bored Bakry

bitmasks, greedy, math, two pointers

Non-equal Neighbours

combinatorics, dp, math

Frequency Queries

data structures, dfs and similar, trees

Korney Korneevich and XOR (hard version)

binary search, brute force, dp, greedy, two pointers

Labyrinth

binary search, dsu, greedy

Managing Telephone Poles

data structures, geometry