Buying gifts

data structures, greedy, sortings

The Very Beautiful Blanket

bitmasks, constructive algorithms

Symmetree

dfs and similar, hashing, implementation, trees

Dasha and Nightmares

bitmasks, hashing, meet-in-the-middle, strings

Tree Cutting

bitmasks, dfs and similar, dp

Count Voting

combinatorics, dp, math

Halve or Subtract

binary search, brute force, dp, greedy, sortings

City Union

constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math

Hot Start Up (hard version)

data structures, dp

Hot Start Up (easy version)

dp

Double Lexicographically Minimum

greedy, strings

Gifts from Grandfather Ahmed

dp, math, number theory

Multitest Generator

brute force, dp

Shocking Arrangement

constructive algorithms, greedy, math

Candy Store

greedy, math, number theory

Li Hua and Path

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

Li Hua and Array

brute force, data structures, dsu, math, number theory, two pointers

Li Hua and Tree

brute force, data structures, dfs and similar, dp, implementation, trees

Li Hua and Chess

constructive algorithms, greedy, interactive

Strange Triples

brute force, math, number theory

Colored Subgraphs

dfs and similar, dp, games, greedy, trees

Maximum Subarray

data structures, dp, greedy, two pointers

Maximum Set

binary search, math

Removal Sequences

bitmasks, dfs and similar, graphs

Blocking Chips

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

Explosions?

binary search, data structures, dp, greedy, math

Triangle Coloring

combinatorics, math

Labeling the Tree with Distances

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

Counting Factorizations

combinatorics, divide and conquer, dp, math, number theory

Rebrending

brute force, data structures, divide and conquer, implementation

Velepin and Marketing

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

Moscow Gorillas

binary search, dp, greedy, implementation, math, two pointers

Graph Coloring (hard version)

brute force, combinatorics, divide and conquer, dp, fft, graphs

Graph Coloring (easy version)

combinatorics, dp, graphs

Divisors and Table

brute force, dfs and similar, dp, number theory

Fixed Prefix Permutations

binary search, bitmasks, data structures, hashing, math, sortings

Teleporters (Hard Version)

binary search, greedy, 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

Serval and Brain Power

bitmasks, brute force, dp, greedy, implementation, strings

Serval and Music Game

brute force, dp, implementation, math, number theory

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Sum Over Zero

data structures, dfs and similar, dp

Moving Dots

binary search, brute force, combinatorics, math, two pointers

Treasure Hunt

data structures, divide and conquer, two pointers

Codeforces Scoreboard

binary search, data structures, dp, geometry

Colorful Tree Again

brute force, data structures, trees

Inverse Transformation

constructive algorithms, implementation, math

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

Remove the Bracket

dp, greedy, math

Minimums or Medians

Infinite Game

brute force, combinatorics, dp, games, probabilities

Wooden Spoon

combinatorics, dp

Monsters (hard version)

data structures, greedy

Letter Exchange

constructive algorithms

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Double Sort II

dfs and similar, flows, graph matchings, graphs

Game of the Year

brute force, data structures, math, number theory

Different Arrays

brute force, dp, implementation

Yet Another Tournament

binary search, greedy, sortings

Window Signals (hard version)

Window Signals (easy version)

Diverse Coloring

constructive algorithms, trees

Bracket Insertion

combinatorics, dp, math, trees

Rectangle Shrinking

binary search, brute force, data structures, greedy, implementation, two pointers

Many Perfect Squares

brute force, math, number theory

Equal Frequencies

brute force, constructive algorithms, greedy, implementation, sortings, strings

Delicious Dessert

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

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Josuke and Complete Graph

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

Bit Guessing Game

binary search, bitmasks, constructive algorithms, interactive

Olympic Team Building

brute force, meet-in-the-middle

The Game of the Century

constructive algorithms, graphs, shortest paths

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Boris and His Amazing Haircut

constructive algorithms, data structures, dp, dsu, greedy, sortings

Least Prefix Sum

data structures, greedy

Maximizing Root

dfs and similar, dp, graphs, math, number theory, trees

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Flexible String Revisit

combinatorics, dp, math, probabilities

Flexible String

bitmasks, brute force, strings

Comfortably Numb

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

Edge Reverse

binary search, dfs and similar, graphs, trees

Score of a Tree

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

Quiz Master

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

Count Permutations

math

Parmigiana With Seafood

binary search, dp, greedy, trees

Uniform Chemistry

dp, math

Italian Data Centers

graphs, shortest paths

Spinach Pizza

games, geometry, greedy, interactive

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

Train Splitting

constructive algorithms, graphs, greedy

Crossing the Railways

data structures, dp

Teamwork

constructive algorithms, greedy, math

Library game

games, greedy, interactive, sortings

Vittorio Plays with LEGO Bricks

dp, geometry

Laboratory on Pluto

constructive algorithms, dp, greedy, math

The Human Equation

greedy, implementation