Minimum Difficulty

brute force, implementation, math

Modular Equations

math, number theory

Digital Counter

implementation

Sharti

data structures, games

Birthday

data structures, dfs and similar, dp, trees

Helping People

dp, probabilities

Obsessive String

dp, strings

Treasure

greedy

Vasya and Polynomial

math

Vasya and Chess

constructive algorithms, games, math

Vasya and Basketball

binary search, brute force, data structures, implementation, sortings, two pointers

Vasya and Wrestling

implementation

Vasya and Football

implementation

Vanya and Field

math

Vanya and Computer Game

binary search, implementation, math, sortings

Vanya and Exams

greedy, sortings

Vanya and Lanterns

binary search, implementation, math, sortings

Vanya and Cubes

implementation

Deciphering

flows, graph matchings

New York Hotel

greedy, math

Up the hill

constructive algorithms, implementation

Treeland Tour

data structures, dfs and similar, dp, trees

Restoring Increasing Sequence

binary search, brute force, greedy, implementation

Chocolate

brute force, dfs and similar, math, meet-in-the-middle, number theory

Hacking Cypher

brute force, math, number theory, strings

Queue

dsu, implementation

Team Olympiad

greedy, implementation, sortings

Special Matrices

combinatorics, dp

Hiking

binary search, dp

Unbearable Controversy of Being

brute force, combinatorics, dfs and similar, graphs

Given Length and Sum of Digits...

dp, greedy, implementation

BerSU Ball

dfs and similar, dp, graph matchings, greedy, sortings, two pointers

SwapSort

greedy, implementation, sortings

Candy Boxes

brute force, constructive algorithms, math

Giga Tower

brute force

Tourists

data structures, dfs and similar, graphs, trees

Conveyor Belts

data structures

Prefix Product Sequence

constructive algorithms, math, number theory

Strip

binary search, data structures, dp, two pointers

Fight the Monster

binary search, brute force, implementation

LIS of Sequence

data structures, dp, greedy, hashing, math

Valid Sets

dfs and similar, dp, math, trees

Palindrome Transformation

brute force, greedy, implementation

OR in Matrix

greedy, hashing, implementation

Calculating Function

implementation, math

Valuable Resources

brute force, greedy

Factory

implementation, math, matrices

Sign on Fence

binary search, constructive algorithms, data structures

Kindergarten

data structures, dp, greedy

Strange Sorting

implementation, math

Maximum Value

binary search, math, sortings, two pointers

Bits

bitmasks, constructive algorithms

Friends and Presents

binary search, math

Counterexample

brute force, implementation, math, number theory

ELCA

data structures, trees

Random Function and Tree

combinatorics, dp, trees

Game with Strings

bitmasks, dp, probabilities

Interesting Array

constructive algorithms, data structures, trees

Diverse Permutation

constructive algorithms, greedy

Parking Lot

data structures, divide and conquer

Parcels

dp, graphs

Riding in a Lift

combinatorics, dp

Long Jumps

binary search, greedy, implementation

Exams

greedy, sortings

Towers

brute force, constructive algorithms, greedy, implementation, sortings

Expression

brute force, math

Wavy numbers

brute force, dfs and similar, meet-in-the-middle, sortings

Red-Green Towers

dp

Table Decorations

greedy

Random Teams

combinatorics, constructive algorithms, greedy, math

Initial Bet

implementation

Dreamoon and Notepad

data structures

Dreamoon and Binary

dp, strings

Dreamoon and Strings

dp, strings

Dreamoon and Sets

constructive algorithms, greedy, math

Dreamoon and Sums

math

Dreamoon and WiFi

bitmasks, brute force, combinatorics, dp, math, probabilities

Dreamoon and Stairs

implementation, math

Meta-universe

data structures

Strongly Connected City 2

dfs and similar

CGCDSSQ

brute force, data structures, math

Kamal-ol-molk's Painting

brute force, constructive algorithms, greedy

Strongly Connected City

brute force, dfs and similar, graphs, implementation

Bayan Bus

implementation

Ant colony

data structures, math, number theory

Pillars

binary search, data structures, dp, sortings, trees

Flowers

dp

Captain Marmot

brute force, geometry

Worms

binary search, implementation

Keyboard

implementation

Design Tutorial: Increase the Constraints

bitmasks, data structures, fft

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

Design Tutorial: Learn from a Game

constructive algorithms, implementation

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Design Tutorial: Make It Nondeterministic

greedy

Design Tutorial: Learn from Life

Design Tutorial: Learn from Math

math, number theory

MUH and Lots and Lots of Segments

data structures, dsu

MUH and Cube Walls

string suffix structures, strings

MUH and House of Cards

binary search, brute force, greedy, math