Is It a Cat?

implementation, 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

Equalize by Divide

brute force, constructive algorithms, greedy, math

Recent Actions

data structures, greedy, implementation, math

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

Three Sevens

brute force, data structures, greedy, implementation

Showstopper

greedy, implementation, sortings

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

Li Hua and Pattern

constructive algorithms, greedy

Li Hua and Maze

constructive algorithms, flows, graphs, greedy, implementation

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

Asterisk-Minor Template

implementation, strings

Typical Interview Problem

brute force, implementation, strings

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

Tea Tasting

binary search, data structures, implementation

Ideal Point

brute force, geometry, greedy

Two Towers

brute force, implementation, strings

Labeling the Tree with Distances

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

Counting Factorizations

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

Scoring Subsequences

binary search, greedy, math, two pointers

Not Dividing

constructive algorithms, greedy, math

Prefix and Suffix Array

strings

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

Dora and Search

constructive algorithms, data structures, two pointers

Fedya and Array

constructive algorithms, math

Yet Another Promotion

greedy, math

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

Min Max Sort

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

Stand-up Comedian

greedy, math

GamingForces

greedy, sortings

Teleporters (Hard Version)

binary search, greedy, sortings

Teleporters (Easy Version)

greedy, sortings

Range Update Point Query

binary search, brute force, data structures

Negatives and Positives

dp, greedy, sortings

Distinct Split

brute force, greedy, strings

Prepend and Append

implementation, two pointers

Following Directions

geometry, implementation

Codeforces Checking

implementation, strings

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

Vlad and a Pair of Numbers

bitmasks, constructive algorithms

Matryoshkas

data structures, greedy, sortings

Premutation

brute force, implementation, math

Taisia and Dice

greedy, greedy, math

Polycarp and the Day of Pi

implementation, math, strings

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

Serval and Toxel's Arrays

combinatorics, dp, implementation, math

Serval and Inversion Magic

brute force, implementation, strings, two pointers

Serval and Mocha's Array

brute force, math, number theory

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

Matching Numbers

constructive algorithms, greedy, math

Sum of Two Numbers

constructive algorithms, greedy, implementation, math, probabilities

One and Two

brute force, implementation, math

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

Number Factorization

greedy, math, number theory

Exponential Equation

constructive algorithms, math

Cake Assembly Line

brute force, sortings

Alternating Deck (hard version)

implementation

Non-alternating Deck (easy version)

implementation

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

Monsters (easy version)

brute force, greedy

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Double Sort II

dfs and similar, flows, graph matchings, graphs