The Sum of Good Numbers

hashing, math, string suffix structures, strings

Cross Xor

constructive algorithms, graphs, math, matrices

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Asterism Stream

dp, math, matrices

Cycle Palindrome

constructive algorithms, graphs, math

Geometric Progressions

math

Roads in E City

interactive, math, probabilities, trees

Wooden Raft

binary search, math, number theory

Power Substring

math, number theory

New Year and the Factorisation Collaboration

interactive, math, number theory

Game of AI (easy version)

combinatorics, constructive algorithms, dp, fft, math

Bitwise Magic

dp, math

Byteland coins

combinatorics, dp, math

Xor-quiz

constructive algorithms, dp, interactive, math, number theory

Math, math everywhere

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

Uniform Chemistry

dp, math

Chess Rush

*special problem, combinatorics, dp, implementation, math

Number of Binominal Coefficients

dp, math, number theory

Oppa Funcan Style Remastered

graphs, math, number theory, shortest paths

Transforming Sequence

combinatorics, dp, fft, math

DIY Tree

graphs, greedy, math, probabilities

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Permutation for Burenka

data structures, graph matchings, greedy, math, trees

AmShZ Farm

combinatorics, fft, math

Fishingprince Plays With Array Again

brute force, data structures, geometry, math

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

New Road Network

constructive algorithms, greedy, math

Gregor and the Odd Cows (Hard)

brute force, geometry, math, number theory

Doping

combinatorics, dp, math

Combining Slimes

dp, math, matrices, probabilities

Kevin and Grid

fft, graphs, math

Special Positions

combinatorics, divide and conquer, fft, math

Multithreading (Hard Version)

combinatorics, implementation, math

Burenka, an Array and Queries

data structures, math, number theory

Johnny and New Toy

data structures, implementation, math

Moving Walkways

data structures, greedy, math

Problems for Codeforces

combinatorics, fft, math

Flowers and Chocolate

combinatorics, math, matrices

El Toll Caves

math

Ela and Prime GCD

constructive algorithms, math, number theory

Origami

geometry, math, sortings

Cyclic Cipher

fft, math

Dirty plates

constructive algorithms, math

Egg Roulette

bitmasks, brute force, divide and conquer, math, meet-in-the-middle

Innovative Washing Machine

geometry, math, two pointers

Complete the Permutations

combinatorics, fft, graphs, math

Gregor and the Two Painters

data structures, divide and conquer, graphs, greedy, math

Replace All

combinatorics, dp, math

Hard Cut

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

Radix sum

fft, math, number theory

Fedya the Potter

binary search, implementation, math, number theory

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Stairs

combinatorics, divide and conquer, dp, fft, math

Test Data Generation

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

Number Discovery

math

Two Sorts

binary search, dfs and similar, math, meet-in-the-middle

Koxia and Bracket

divide and conquer, fft, math

So Mean

interactive, math

Strange device

binary search, interactive, math, trees

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Don't Exceed

math, probabilities

Organizing a Music Festival

dfs and similar, math

Beauty of a Permutation

constructive algorithms, math

Red-Blue Graph

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

Yet Yet Another Permutation Problem

divide and conquer, fft, math

Shady Lady

geometry, math

Long number

expression parsing, math, number theory

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Bad Cryptography

math, number theory

Intergalactic Sliding Puzzle

combinatorics, constructive algorithms, math

Density of subarrays

dp, math

Rin and The Unknown Flower

constructive algorithms, greedy, interactive, math

Minimize Inversions Number

data structures, greedy, math, sortings

Chiori and Doll Picking (hard version)

bitmasks, brute force, combinatorics, math

Xor on Figures

constructive algorithms, fft, math

Bully Sort

data structures, math

Forest Fires

math

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

School Clubs

dp, fft, math, number theory, probabilities

Epic Convolution

chinese remainder theorem, fft, math, number theory

Omkar and Mosaic

combinatorics, constructive algorithms, math

Maximum Product?

brute force, combinatorics, dp, greedy, implementation, math, two pointers

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Slime and Sequences (Hard Version)

dp, fft, math

Impressionism

constructive algorithms, graphs, implementation, math

Tasty Dishes

math, matrices

Mio and Lucky Array

constructive algorithms, fft, math, strings

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Tokitsukaze and Gems

dp, math

Mainak and the Bleeding Polygon

binary search, geometry, implementation, math

Koishi's Unconscious Permutation

fft, math

Anti-median (Hard Version)

combinatorics, dp, math

Cubic Lattice

geometry, math, matrices, number theory

Game of AI (hard version)

combinatorics, fft, math

Three Minimums

combinatorics, constructive algorithms, divide and conquer, dp, fft, math

Count Permutations

math

Heroes of Might

math

Game of Chance

math, probabilities