Permutation Counting

brute force, combinatorics, dp, fft, math

Roland and Rose

brute force, geometry, math, sortings

Shortest path

brute force, geometry, math, shortest paths

Coins

math

You Are Given Some Letters...

binary search, implementation, math

Wojtek and Card Tricks

math

Donkey and Stars

data structures, dp, geometry, math, sortings

The Final Pursuit

bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math

Once in a casino

constructive algorithms, greedy, implementation, math

Illumination

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

Permutation of Given

constructive algorithms, math

Fox and Perfect Sets

math

Two Sets

bitmasks, math

Help Shrek and Donkey

dp, games, math, probabilities

Is It Rated?

greedy, interactive, math, probabilities

Ever-Hungry Krakozyabra

brute force, combinatorics, greedy, math

Birthday

greedy, math, probabilities

Matrix Rank (Hard Version)

combinatorics, dp, math, matrices, string suffix structures

Crop Squares

constructive algorithms, geometry, interactive, math

Japanese Game

constructive algorithms, math

Another n-dimensional chocolate bar

dp, math, meet-in-the-middle, number theory

Unordered Swaps

constructive algorithms, dfs and similar, graphs, greedy, math, sortings, trees

Farmer John's Favorite Function

brute force, data structures, implementation, math

String Counting

combinatorics, dp, fft, math

No Game No Life

bitmasks, games, math, matrices

Bear and Destroying Subtrees

dp, math, probabilities, trees

Matrix Rank (Easy Version)

brute force, combinatorics, dp, math, matrices

Converging Array (Easy Version)

dp, math

Chiori and Doll Picking (easy version)

bitmasks, brute force, combinatorics, math

Museum

math, matrices, probabilities

Nene vs. Monsters (Hard Version)

brute force, greedy, implementation, math

Juju and Binary String

brute force, constructive algorithms, greedy, math

Bracket Insertion

combinatorics, dp, math, trees

Misha and Paintings

constructive algorithms, data structures, greedy, implementation, math

Friends

binary search, bitmasks, data structures, math

Fibonotci

data structures, math, matrices

Chaotic V.

dp, graphs, greedy, math, number theory, trees

Johnny Solving

constructive algorithms, dfs and similar, graphs, math

Balanced Subsequences

combinatorics, dp, math

Rusty String

fft, math, strings

Abnormal Permutation Pairs (hard version)

combinatorics, dp, fft, math

Airplane Arrangements

math, number theory

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers

Christmas Chocolates

dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees

Nested Rubber Bands

constructive algorithms, dfs and similar, dp, math, trees

Majority

combinatorics, dp, math, strings

Mother of Dragons

brute force, graphs, math, meet-in-the-middle

Strange Set

flows, math

Phoenix and Odometers

dfs and similar, graphs, math, number theory

Résumé Review

binary search, greedy, math

Boring Queries

data structures, math, number theory

Common Divisor Graph

brute force, constructive algorithms, dsu, graphs, hashing, math, number theory

Two Arrays

bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers

Conveyor

constructive algorithms, dp, math

Cowmpany Cowmpensation

combinatorics, dp, math, trees

Latin Square

math, matrices

Partitions

combinatorics, math, number theory

PermuTree (hard version)

bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Power Tower

chinese remainder theorem, math, number theory

Subset with Zero Sum

constructive algorithms, dfs and similar, graphs, math

Interesting Sequence

math

Rotatable Number

math, number theory

Endless Matrix

math

X-mouse in the Campus

bitmasks, math, number theory

Mushroom Gnomes

math, matrices

Tetragon

geometry, math

Upgrading Tree

constructive algorithms, dfs and similar, graphs, math, trees

Visit of the Great

math, number theory

Candies for Children

brute force, math

Lostborn

dp, math, number theory

Gifts

combinatorics, dp, math, probabilities

Sum of Matchings

brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math

Superhero's Job

dfs and similar, dp, hashing, math, number theory

Formalism for Formalism

bitmasks, dp, math

GCD is Greater

brute force, data structures, math, number theory

Limak and Shooting Points

brute force, geometry, math

Cutting Rectangle

brute force, math, number theory

Piglet's Birthday

dp, math, probabilities

Divisor Set

divide and conquer, fft, greedy, math, number theory

Strange Sorting

implementation, math

Maximizing Root

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

Tree Sum

combinatorics, math, trees

Yet Another DAG Problem

bitmasks, dfs and similar, dp, flows, graphs, math

Fancy Arrays

combinatorics, dp, math, matrices

Bracket Xoring

constructive algorithms, greedy, implementation, math

Interval Cubing

data structures, math

Winding polygonal line

constructive algorithms, geometry, greedy, math

Timofey and remoduling

brute force, implementation, math, number theory

Count Voting

combinatorics, dp, math

Timber

combinatorics, dp, fft, math

Min Cost Permutation (Easy Version)

brute force, constructive algorithms, greedy, math

Vika and Stone Skipping

brute force, implementation, math, number theory

Number Challenge

combinatorics, dp, implementation, math, number theory

Bingo

bitmasks, combinatorics, dp, math, probabilities

Conditional Mix

combinatorics, dp, math

Serval and Bonus Problem

combinatorics, dp, math, probabilities

Circular Dungeon

greedy, math, probabilities

Running Competition

bitmasks, fft, math, number theory

Counting Prefixes

combinatorics, constructive algorithms, dp, implementation, math