Mysterious Crime

brute force, combinatorics, math, meet-in-the-middle, two pointers

Maximum Reduction

combinatorics, data structures, math

Relatively Prime Powers

combinatorics, math, number theory

Classy Numbers

combinatorics, dp

Region Separation

combinatorics, dp, number theory, trees

Order book

combinatorics, data structures, greedy

Inverse Coloring

combinatorics, dp, math

Intercity Travelling

combinatorics, math, probabilities

Pave the Parallelepiped

bitmasks, brute force, combinatorics, math, number theory

Reorder the Array

combinatorics, data structures, math, sortings, two pointers

Yet Another Problem On a Subsequence

combinatorics, dp

Cycles in product

combinatorics, divide and conquer, trees

Sky Full of Stars

combinatorics, math

Roman Digits

brute force, combinatorics, dp, greedy, math

Cowmpany Cowmpensation

combinatorics, dp, math, trees

Bus Number

brute force, combinatorics, math

Petr and Permutations

combinatorics, math

Team Players

combinatorics

K Paths

combinatorics, data structures, dp, fft, math

Bus Video System

combinatorics, math

Partitions

combinatorics, math, number theory

Bandit Blues

combinatorics, dp, fft, math

Alternating Tree

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

Path Counting

combinatorics, dp

Fibonacci String Subsequences

combinatorics, dp, matrices

Max History

combinatorics, math

A Creative Cutout

brute force, combinatorics, math

Team Work

combinatorics, dp, math

Красивая команда

*special problem, combinatorics, math

List Of Integers

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

Pollywog

combinatorics, dp, matrices

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Travelling Salesman and Special Numbers

brute force, combinatorics, dp

New Year and Entity Enumeration

bitmasks, combinatorics, dp, math

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Nephren Runs a Cinema

chinese remainder theorem, combinatorics, math, number theory

String Mark

combinatorics, math, strings

Square Subsets

bitmasks, combinatorics, dp, math

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

Counting Arrays

combinatorics, dp, math, number theory

Lust

combinatorics, math, matrices

Almost Identity Permutations

combinatorics, dp, math

Maximum Element

combinatorics, dp, math

Numbers on the blackboard

combinatorics, dp

High Cry

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

The Intriguing Obsession

combinatorics, dp, math

Flowers and Chocolate

combinatorics, math, matrices

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Eleventh Birthday

combinatorics, dp, math

Product transformation

combinatorics, math, number theory

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Shake It!

combinatorics, dp, flows, graphs

Rectangles

combinatorics, math

On the Bench

combinatorics, dp

Leha and Function

combinatorics, greedy, math, number theory, sortings

Winter is here

combinatorics, dp, math, number theory

Prefix Sums

binary search, brute force, combinatorics, math, matrices

Ever-Hungry Krakozyabra

brute force, combinatorics, greedy, math

Singer House

combinatorics, dp, graphs, trees

Makes And The Product

combinatorics, implementation, math, sortings

Karen and Cards

binary search, combinatorics, data structures, geometry

Karen and Test

brute force, combinatorics, constructive algorithms, math

An unavoidable detour for home

combinatorics, dp, graphs, shortest paths

Find a car

combinatorics, divide and conquer, dp

Fake bullions

combinatorics, dfs and similar, dp, graphs, number theory

Minimum number of steps

combinatorics, greedy, implementation, math

Coprime Subsequences

bitmasks, combinatorics, number theory

Replace All

combinatorics, dp, math

Weird journey

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

Anton and School - 2

combinatorics, dp, math, number theory

Sherlock and the Encrypted Data

bitmasks, combinatorics, dp

Test Data Generation

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

Barrels and boxes

brute force, combinatorics, math, number theory, probabilities

Tree nesting

combinatorics, graphs, trees

Bash Plays with Functions

brute force, combinatorics, dp, number theory

Byteland coins

combinatorics, dp, math

Bacterial Melee

brute force, combinatorics, dp, string suffix structures

PolandBall and Many Other Balls

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

New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

Igor and Interesting Numbers

brute force, combinatorics, dp, math

Tennis Championship

combinatorics, constructive algorithms, greedy, math

Uniformly Branched Trees

combinatorics, dp, trees

Research Rover

combinatorics, dp

Festival Organization

combinatorics, math, number theory

Complete the Permutations

combinatorics, fft, graphs, math

Memory and Scores

combinatorics, dp, math

Directed Roads

combinatorics, dfs and similar, graphs, math

Coprime Permutation

combinatorics, number theory

PLEASE

combinatorics, dp, implementation, math, matrices

The Wall (medium)

combinatorics

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

Mike and Chocolate Thieves

binary search, combinatorics, math

Robbers' watch

brute force, combinatorics, dp, math

Vanya and Label

bitmasks, combinatorics, implementation, strings

Codeword

combinatorics, strings

Different Subsets For All Tuples

combinatorics, math

Fence Divercity

combinatorics, dp, number theory

Move by Prime

combinatorics, math, number theory

Foe Pairs

combinatorics, sortings, two pointers

Cowslip Collections

combinatorics, math, number theory