Counting Factorizations

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

Arena

combinatorics, dp, math

Beautiful Mirrors

data structures, dp, math, probabilities

Let's Play Osu!

dp, math, probabilities

Accounting

brute force, math

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Predict Outcome of the Game

brute force, implementation, math

Recovering BST

brute force, dp, math, number theory, trees

Monocarp and the Set

combinatorics, data structures, math

Laboratory Work

implementation, math

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

Basketball Team

combinatorics, dp, math, probabilities

The Beatles

brute force, math

Rebus

constructive algorithms, expression parsing, greedy, math

Road to Post Office

math

Counting Arrays

combinatorics, dp, math, number theory

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Alternating Sum

math, number theory

Cookies

math

Kamil and Making a Stream

math, number theory, trees

Recover the String

constructive algorithms, greedy, implementation, math

Score of a Tree

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

Party

constructive algorithms, graphs, math

Lost Arithmetic Progression

combinatorics, math, number theory

Good Trip

combinatorics, dp, math, probabilities

DZY Loves Fibonacci Numbers

data structures, math, number theory

As Fast As Possible

binary search, math

Decryption

constructive algorithms, implementation, math, number theory

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Vanya and Computer Game

binary search, implementation, math, sortings

Magic Five

combinatorics, math

Calendar Ambiguity

math, number theory

Common Number

binary search, combinatorics, dp, math

Lucky Permutation

constructive algorithms, math

About Bacteria

implementation, math

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Non-Palindromic Substring

hashing, implementation, math, strings

Toy Sum

greedy, implementation, math

Grid Xor

constructive algorithms, greedy, implementation, interactive, math

Mahmoud and Ehab and another array construction task

constructive algorithms, greedy, math, number theory

Petya and His Friends

constructive algorithms, math, number theory

Om Nom and Spiders

implementation, math

Four Segments

brute force, constructive algorithms, geometry, implementation, math

The Big Race

math

Number of Components

combinatorics, data structures, dp, math

Infinite Path

brute force, dfs and similar, graphs, math, number theory

Game on Sum (Easy Version)

combinatorics, dp, games, math

Five Dimensional Points

brute force, geometry, math

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Clear Symmetry

constructive algorithms, dp, math

Let's Play the Words?

data structures, hashing, implementation, math

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

Expand the Path

brute force, combinatorics, data structures, implementation, math

My pretty girl Noora

brute force, dp, greedy, math, number theory

Prime Number

math, number theory

Send Boxes to Alice (Hard Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Pasha and Phone

binary search, math

Marathon

implementation, math

Intercity Travelling

combinatorics, math, probabilities

Kuroni and the Score Distribution

constructive algorithms, greedy, implementation, math

Inna and Huge Candy Matrix

implementation, math

MEX vs MED

math, two pointers

Fibonacci Strings

greedy, implementation, math, number theory

Elimination

dp, implementation, math

Roman Digits

brute force, combinatorics, dp, greedy, math

Guest Student

math

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Placing Rooks

combinatorics, fft, math

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Boundary

brute force, math

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Potion Brewing Class

dfs and similar, math, number theory, trees

Counting Rhyme

dp, math, number theory

Malek Dance Club

combinatorics, math

Video Cards

brute force, data structures, implementation, math, number theory

Jon and Orbs

dp, math, probabilities

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

Maximize Sum of Digits

*special problem, implementation, math

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Train Hard, Win Easy

constructive algorithms, greedy, math, sortings

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Jeff and Rounding

dp, greedy, implementation, math

Winter is here

combinatorics, dp, math, number theory

Shovel Sale

constructive algorithms, math

Team Work

combinatorics, dp, math

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Domino (hard version)

constructive algorithms, implementation, math

Sum of Remainders

implementation, math, number theory

The LCMs Must be Large

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

Put Knight!

games, math

Graph Cost

dp, greedy, math, number theory

Measuring Lengths in Baden

math

Anton and School - 2

combinatorics, dp, math, number theory

Two Semiknights Meet

greedy, math

Doremy's Pegging Game

combinatorics, dp, math