Flag

brute force, combinatorics, dp, implementation

Coprime Subsequences

bitmasks, combinatorics, number theory

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Expand the Path

brute force, combinatorics, data structures, implementation, math

Intercity Travelling

combinatorics, math, probabilities

Roman Digits

brute force, combinatorics, dp, greedy, math

Tyler and Strings

combinatorics, data structures, implementation

Polo the Penguin and Houses

combinatorics

Increase Sequence

combinatorics, dp

Placing Rooks

combinatorics, fft, math

Malek Dance Club

combinatorics, math

Vowels

combinatorics, divide and conquer, dp

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Games with Rectangle

combinatorics, dp

Winter is here

combinatorics, dp, math, number theory

Team Work

combinatorics, dp, math

Jerry's Protest

brute force, combinatorics, dp, probabilities

ConstructOR

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

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Anton and School - 2

combinatorics, dp, math, number theory

Doremy's Pegging Game

combinatorics, dp, math

Challenge Pennants

combinatorics, math

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Dima and Two Sequences

combinatorics, math, sortings

Not Quite Lee

combinatorics, dp, math, number theory

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Moodular Arithmetic

combinatorics, dfs and similar, dsu, math, number theory

Flexible String Revisit

combinatorics, dp, math, probabilities

Priority Queue

combinatorics, dp, implementation, math, ternary search

Tree Array

brute force, combinatorics, dp, graphs, math, probabilities, trees

Another Filling the Grid

combinatorics, dp, math

LuoTianyi and the Floating Islands (Hard Version)

combinatorics, dfs and similar, math, probabilities, trees

Colorings and Dominoes

combinatorics, dp, greedy, math

One-Dimensional Puzzle

combinatorics, math, number theory

Range Deleting

binary search, combinatorics, data structures, two pointers

Segment Sum

bitmasks, combinatorics, dp, math

Omkar and Forest

combinatorics, graphs, math, shortest paths

Carry Bit

combinatorics, math

Counting Binary Strings

combinatorics, dp, math

Array

combinatorics, math

Iahub and Permutations

combinatorics, math

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

Cipher

combinatorics, dp

Weird journey

combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Jeff and Furik

combinatorics, dp, probabilities

Wilbur and Points

combinatorics, greedy, sortings

Staircases

brute force, combinatorics, data structures, dfs and similar, dp, implementation, math

Symmetric and Transitive

combinatorics, dp, math

Mocha and Stars

combinatorics, dp, fft, math, number theory

Two Heaps

combinatorics, constructive algorithms, greedy, implementation, math, sortings

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

Random Task

binary search, bitmasks, combinatorics, dp, math

Kyoya and Permutation

binary search, combinatorics, constructive algorithms, greedy, implementation, math

Playoff Fixing

combinatorics, trees

Combinatorics Problem

brute force, combinatorics, dp

Yaroslav and Two Strings

combinatorics, dp

PLEASE

combinatorics, dp, implementation, math, matrices

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

LCM Sum (easy version)

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

Lengthening Sticks

combinatorics, implementation, math

Star MST

combinatorics, dp, graph matchings, math

Right Triangles

combinatorics

Mark and Professor Koro

binary search, bitmasks, brute force, combinatorics, data structures, greedy

Game on Sum (Hard Version)

combinatorics, dp, games, math

High Cry

binary search, bitmasks, combinatorics, data structures, divide and conquer

Girl Permutation

combinatorics, dp, math, number theory

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

Kim's Quest

bitmasks, combinatorics, dp

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Short Colorful Strip

combinatorics, dfs and similar, dp

Vlad and the Nice Paths (easy version)

combinatorics, dp, math

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Lucky Subsequence

combinatorics, dp, math

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Inverse Coloring

combinatorics, dp, math

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

Pig and Palindromes

combinatorics, dp

Pluses everywhere

combinatorics, dp, math, number theory

Excellent Arrays

binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Partial Sorting

combinatorics, math, number theory

Little Elephant and LCM

binary search, combinatorics, dp, math

Equidistant Vertices

brute force, combinatorics, dfs and similar, dp, trees

Key Storage

combinatorics, math

The Three Little Pigs

combinatorics, dp, fft, math

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Expected Damage

binary search, combinatorics, probabilities

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Order book

combinatorics, data structures, greedy

Cards

combinatorics, dp, math, number theory, probabilities

List Of Integers

binary search, bitmasks, brute force, combinatorics, math, number theory

Numbers

combinatorics, dp

Greg and Friends

combinatorics, dp, graphs, shortest paths

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees