Chess

brute force, implementation, math

Multicolored Cars

data structures, implementation

Lazy Student

constructive algorithms, data structures, graphs

Find Pair

implementation, math, sortings

Puzzles

dfs and similar, math, probabilities, trees

Glass Half Spilled

dp

Three Sequences

constructive algorithms, data structures, greedy, math

Longest Subsequence

brute force, math, number theory

DZY Loves Physics

greedy, math

Sasha and Array

data structures, math, matrices

Unshuffling a Deck

constructive algorithms, implementation

A Student's Dream

greedy, math

Numerical Sequence (easy version)

binary search, brute force, math

Amity Assessment

brute force, constructive algorithms, implementation

Phoenix and Computers

combinatorics, dp, math

Stairs and Elevators

binary search

Mike's Sequence

*special problem, divide and conquer, implementation, math

A Growing Tree

data structures, dfs and similar, trees

Strip

binary search, data structures, dp, two pointers

Sausage Maximization

bitmasks, data structures, trees

Counting Factorizations

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

Nephren gives a riddle

binary search, dfs and similar

The Wu

bitmasks, brute force, data structures

Quiz League

implementation

Flea travel

implementation, math

Login Verification

*special problem, strings

Good Triple

brute force, two pointers

Mischievous Mess Makers

greedy, math

Kaavi and Magic Spell

dp, strings

Arena

combinatorics, dp, math

Let's Play Osu!

dp, math, probabilities

Feed Cats

data structures, dp, sortings

Lucky Common Subsequence

dp, strings

Mishka and Interesting sum

data structures

Make It Increasing

binary search, constructive algorithms, data structures, dp, implementation

The Beatles

brute force, math

Earn or Unlock

bitmasks, brute force, dp

Messenger Simulator

data structures

Beautiful Mirrors

data structures, dp, math, probabilities

Permutation Addicts

constructive algorithms, data structures, dfs and similar, dsu, graphs, trees

Accounting

brute force, math

Monocarp and the Set

combinatorics, data structures, math

Maximum Control (easy)

implementation

Image Preview

binary search, brute force, dp, two pointers

Two Chess Pieces

dfs and similar, dp, greedy, trees

Once Again...

constructive algorithms, dp, matrices

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Minimum Path

graphs, shortest paths

Travel Card

binary search, dp

Predict Outcome of the Game

brute force, implementation, math

Recovering BST

brute force, dp, math, number theory, trees

Union of Doubly Linked Lists

implementation

Epidemic in Monstropolis

constructive algorithms, dp, greedy, two pointers

Laboratory Work

implementation, math

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

Basketball Team

combinatorics, dp, math, probabilities

GCD Queries

constructive algorithms, interactive, number theory

Almost Acyclic Graph

dfs and similar, graphs

Constructing Tests

binary search, brute force, constructive algorithms

Array and Operations

flows, graph matchings, number theory

Bottle Arrangements

constructive algorithms

Mahmoud and a Dictionary

data structures, dfs and similar, dp, dsu, graphs

Jongmah

dp

Game of the Rows

brute force, greedy, implementation

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

Counting Arrays

combinatorics, dp, math, number theory

Complete the Projects (easy version)

greedy

Power Transmission (Easy Edition)

brute force, geometry

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Rebus

constructive algorithms, expression parsing, greedy, math

Pencils and Boxes

binary search, data structures, dp, greedy, two pointers

Looking for Order

bitmasks, dp

Road to Post Office

math

Regular Bridge

constructive algorithms, graphs, implementation

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Cycle in Graph

dfs and similar, graphs

News About Credit

*special problem, greedy, two pointers

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Inna and Nine

combinatorics, greedy

Count the Trains

binary search, data structures, greedy, sortings

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Alternating Sum

math, number theory

Mishap in Club

greedy, implementation

Devu and Flowers

bitmasks, combinatorics, number theory

Train Splitting

constructive algorithms, graphs, greedy

Cookies

math

Hills

dp

Vitya and Strange Lesson

binary search, data structures

Strange Game On Matrix

greedy, two pointers

Facetook Priority Wall

expression parsing, implementation, strings

Letter Exchange

constructive algorithms

Music Festival

binary search, data structures, dp, greedy, sortings

Score of a Tree

bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees

Vladik and Memorable Trip

dp, implementation

Kamil and Making a Stream

math, number theory, trees

Holidays

implementation

Simple Subset

constructive algorithms, greedy, number theory

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers