Engineer Artem

2-sat, chinese remainder theorem, constructive algorithms, fft, flows

Pavel and Triangles

brute force, dp, fft, greedy, ternary search

Placing Rooks

combinatorics, fft, math

Thief in a Shop

divide and conquer, dp, fft, math

Mocha and Stars

combinatorics, dp, fft, math, number theory

Fuzzy Search

bitmasks, brute force, fft

Binary Table

bitmasks, brute force, divide and conquer, dp, fft, math

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

The Three Little Pigs

combinatorics, dp, fft, math

Covered Points

fft, geometry, number theory

Lucky Tickets

divide and conquer, dp, fft

Nikita and Order Statistics

chinese remainder theorem, fft, math

Almost Perfect

combinatorics, fft, math

Dominoes

combinatorics, fft, graphs, math, number theory

PermuTree (hard version)

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

Abnormal Permutation Pairs (easy version)

combinatorics, dp, fft, math

Bandit Blues

combinatorics, dp, fft, math

Yet Another String Matching Problem

fft, math

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Omkar and Akmar

chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

PolandBall and Many Other Balls

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

Ladies' Shop

constructive algorithms, fft, math

Abnormal Permutation Pairs (hard version)

combinatorics, dp, fft, math

Red-White Fence

combinatorics, fft

Rusty String

fft, math, strings

Running Competition

bitmasks, fft, math, number theory

Painting Square

dp, fft

Timber

combinatorics, dp, fft, math

Tree Coloring

combinatorics, divide and conquer, fft

Lightsabers (hard)

fft

Function Sum

brute force, combinatorics, dp, fft, math

Centroid Probabilities

combinatorics, dp, fft, math

Occurrences

combinatorics, dfs and similar, dp, dsu, fft, graphs

Divisor Set

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

String Counting

combinatorics, dp, fft, math

Kyoya and Train

dp, fft, graphs, math, probabilities

Multiset of Strings

bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees

Transforming Sequence

combinatorics, dp, fft, math

Triple

fft, math

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Perpetual Subtraction

fft, math, matrices

Slime and Sequences (Easy Version)

dp, fft, math

Design Tutorial: Increase the Constraints

bitmasks, data structures, fft

Tiles

combinatorics, dp, fft, math

Random Elections

bitmasks, brute force, divide and conquer, fft, math

Multithreading (Easy Version)

combinatorics, fft, math

Graph Coloring (hard version)

brute force, combinatorics, divide and conquer, dp, fft, graphs

Boolean Computer

bitmasks, brute force, fft, math

Product Tuples

divide and conquer, fft

Swimmers in the Pool

dp, fft, math, number theory

Substring Search

bitmasks, brute force, fft

Complete the Permutations

combinatorics, fft, graphs, math

INOI Final Contests

combinatorics, dp, fft

Perfect Encoding

fft, math

Game of Questions

bitmasks, combinatorics, dp, fft, math, probabilities

Permutation Counting

brute force, combinatorics, dp, fft, math

Basis

combinatorics, fft, math, number theory

Xor Spanning Tree

divide and conquer, fft, graphs

AmShZ Farm

combinatorics, fft, math

K Paths

combinatorics, data structures, dp, fft, math

Harry The Potter

brute force, constructive algorithms, dp, fft, implementation, math

Xor on Figures

constructive algorithms, fft, math

Radix sum

fft, math, number theory

Tree

fft, graphs, trees

Special Positions

combinatorics, divide and conquer, fft, math

Kevin and Grid

fft, graphs, math

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Stairs

combinatorics, divide and conquer, dp, fft, math

School Clubs

dp, fft, math, number theory, probabilities

Test Data Generation

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

Epic Convolution

chinese remainder theorem, fft, math, number theory

Game of AI (easy version)

combinatorics, constructive algorithms, dp, fft, math

Cyclic Sum

data structures, fft, number theory

Koxia and Bracket

divide and conquer, fft, math

Heidi Learns Hashing (Hard)

fft, math, number theory

Problems for Codeforces

combinatorics, fft, math

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Again Counting Arrays (Easy Version)

combinatorics, dp, fft, math

Slime and Sequences (Hard Version)

dp, fft, math

Mio and Lucky Array

constructive algorithms, fft, math, strings

Yet Yet Another Permutation Problem

divide and conquer, fft, math

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Cyclic Cipher

fft, math

Cyclic Hamming (Easy Version)

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

Koishi's Unconscious Permutation

fft, math

Short Permutation Problem

combinatorics, dp, fft, math

Game of AI (hard version)

combinatorics, fft, math

Three Minimums

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

Flower Shop

*special problem, data structures, fft, math