Friends and Gifts

constructive algorithms, data structures, math

Candies Division

math

Minutes Before the New Year

math

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Enchanted Artifact

constructive algorithms, interactive, strings

Petya and Exam

greedy, sortings, two pointers

K for the Price of One (Hard Version)

dp, greedy, sortings

K for the Price of One (Easy Version)

dp, greedy, sortings

Temporarily unavailable

implementation, math

Azamon Web Services

greedy

Suffix Three

implementation

Intergalactic Sliding Puzzle

combinatorics, constructive algorithms, math

Kirchhoff's Current Loss

math

Miss Punyverse

dp, greedy, trees

Jeremy Bearimy

dfs and similar, graphs, greedy, trees

Beingawesomeism

implementation, math

Cut and Paste

implementation, math

New Year and Handle Change

binary search, dp

New Year Permutations

combinatorics, dp

Santa's Bot

combinatorics, math, probabilities

Stack of Presents

data structures, implementation

Verse For Santa

binary search, brute force, implementation

New Year Garland

math

Cards

combinatorics, dp, math, number theory, probabilities

Tests for problem D

constructive algorithms, dfs and similar, divide and conquer, trees

Segment Tree

data structures, dsu, graphs, trees

Berry Jam

data structures, dp, greedy, implementation

A and B

greedy, math

Shuffle Hashing

brute force, implementation, strings

Let's Play the Words?

data structures, hashing, implementation, math

Make Them Odd

greedy, number theory

Happy Birthday, Polycarp!

implementation

Asterisk Substrings

string suffix structures

Four Stones

constructive algorithms

Tree Elimination

dp, trees

Beautiful Rectangle

brute force, combinatorics, constructive algorithms, data structures, greedy, math

Two Fairs

combinatorics, dfs and similar, dsu, graphs

As Simple as One and Two

dp, greedy

Two Bracket Sequences

dp, strings, two pointers

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Remove One Element

brute force, dp

Yet Another Broken Keyboard

combinatorics, dp, implementation

Snow Walking Robot

constructive algorithms, greedy, implementation

Three Friends

brute force, greedy, math, sortings

Divide The Students

brute force

Common Number

binary search, combinatorics, dp, math

Portals

data structures, dp, greedy, implementation, sortings

Shawarma Tent

brute force, geometry, greedy, implementation

Blocks

greedy, math

Suits

brute force, greedy, math

Xor on Figures

constructive algorithms, fft, math

Number of Components

data structures

Subset with Zero Sum

constructive algorithms, dfs and similar, graphs, math

Awesome Substrings

math, strings

Divide Points

constructive algorithms, geometry, math

Strange Device

constructive algorithms, interactive, math, sortings

Make Good

bitmasks, constructive algorithms, math

Interesting Subarray

constructive algorithms, greedy, math

Card Game

games, greedy, math

Modulo Equality

brute force, sortings

Equation

brute force, math

Happy Cactus

dp

Invertation in Tournament

brute force, divide and conquer, graphs, math

K Integers

binary search, data structures

Domino for Young

dp, greedy, math

Long Beautiful Integer

constructive algorithms, greedy, implementation, strings

Lexicography

constructive algorithms, strings

Key Storage

combinatorics, math

Just Arrange the Icons

greedy, implementation, math

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings

Help BerLine

constructive algorithms

Game Relics

math, probabilities

Foolprüf Security

graphs

Elections

greedy

DevOps Best Practices

constructive algorithms

Cactus Revenge

constructive algorithms

Balls of Buma

Apprentice Learning Trajectory

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Permutation Concatenation

string suffix structures

Almost Same Distance

dfs and similar, graphs

Spaceship Solitaire

data structures, greedy, implementation

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Diverse Matrix

constructive algorithms, greedy, math, number theory

Dice Tower

constructive algorithms, math

Competitive Programmer

chinese remainder theorem, math

Beautiful Mirrors

data structures, dp, math, probabilities

Beautiful Numbers

data structures, implementation, math, two pointers

Beautiful String

constructive algorithms, greedy

Beautiful Fibonacci Problem

constructive algorithms, number theory

Beautiful League

constructive algorithms, flows, graph matchings

Beautiful Bracket Sequence (hard version)

combinatorics, probabilities

Beautiful Bracket Sequence (easy version)

combinatorics, dp, probabilities

Beautiful Mirrors with queries

data structures, probabilities

Beautiful Sequence

brute force, constructive algorithms, greedy

Beautiful Regional Contest

greedy, implementation

Economic Difficulties

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

Editor

data structures, implementation

Secret Passwords

dfs and similar, dsu, graphs

Everyone is a Winner!

binary search, math, meet-in-the-middle, number theory