3-Coloring

constructive algorithms, games, interactive

Balance the Bits

constructive algorithms, greedy

Going Home

brute force, hashing, implementation, math

Minimum Grid Path

brute force, data structures, greedy, math

Planar Reflections

brute force, data structures, dp

Square-Free Division (easy version)

data structures, dp, greedy, math, number theory, two pointers

k-LCM (hard version)

constructive algorithms, math

Berland Crossword

bitmasks, brute force, greedy, implementation

Maximum width

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

Zookeeper and The Infinite Zoo

bitmasks, constructive algorithms, dp, greedy, math

Pekora and Trampoline

brute force, data structures, dp, greedy, implementation

Equalize the Array

binary search, data structures, greedy, math, sortings

Accidental Victory

binary search, data structures, greedy

RBS Deletion

*special problem, greedy

Pythagorean Triples

binary search, brute force, math, number theory

Minimum Ties

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation, math

Guessing the Greatest (easy version)

binary search, interactive

Eastern Exhibition

binary search, geometry, shortest paths, sortings

Floor and Mod

binary search, brute force, math, number theory

Basic Diplomacy

brute force, constructive algorithms, greedy, implementation

Restore Modulo

implementation, math

Fence Painting

brute force, constructive algorithms, greedy

Searching Local Minimum

binary search, interactive, ternary search

Nezzar and Symmetric Array

implementation, math, sortings

Nezzar and Board

constructive algorithms, math, number theory

Journey

dfs and similar, dp, dsu, implementation

Longest Simple Cycle

dp, graphs, greedy

Advertising Agency

combinatorics, math, sortings

Cleaning the Phone

binary search, dp, sortings, two pointers

Ball in Berland

combinatorics, graphs, math

Array Destruction

brute force, constructive algorithms, data structures, greedy, implementation, sortings

Program

data structures, dp, implementation, strings

No More Inversions

constructive algorithms, math

Correct Placement

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

Ceil Divisions

brute force, constructive algorithms, math, number theory

Building a Fence

dp, greedy, implementation, two pointers

The Robot

brute force, implementation

Road Reform

dsu, graphs, greedy

Full Turn

geometry, hashing, number theory

Firecrackers

binary search, sortings

Berpizza

data structures, implementation

Hills And Valleys

brute force, implementation

Apollo versus Pan

bitmasks, brute force, math

13th Labour of Heracles

data structures, greedy, sortings, trees

Busy Robot

implementation

Find The Array

bitmasks, constructive algorithms, greedy

The Treasure of The Segments

binary search, data structures, greedy

Close Tuples (hard version)

binary search, combinatorics, implementation, math, sortings, two pointers

Close Tuples (easy version)

binary search, combinatorics, math, sortings, two pointers

Add to Neighbour and Remove

greedy, math, number theory

Divide and Summarize

binary search, brute force, data structures, divide and conquer, implementation, sortings

Random Events

dp, math, probabilities

Find the Spruce

brute force, dp, implementation

Row GCD

math, number theory

Sequence and Swaps

dp, greedy, sortings

Triangles

greedy, implementation

Suffix Operations

constructive algorithms, implementation

Radio Towers

combinatorics, dp, math

Toy Blocks

binary search, greedy, math, sortings

Circle Game

games, geometry, math

String Equality

dp, greedy, hashing, implementation, strings

Rating Compression

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

Catching Cheaters

dp, strings

Division

brute force, math, number theory

The Delivery Dilemma

binary search, greedy, sortings

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Extreme Subtraction

constructive algorithms, dp, greedy

Binary Table (Easy Version)

constructive algorithms, implementation

Minimal Height Tree

graphs, greedy, shortest paths, trees

Chef Monocarp

dp, flows, graph matchings, greedy, math, sortings

Binary Search

binary search, combinatorics

Used Markers

*special problem, greedy

Black Friday

*special problem, implementation

Polycarp and the Language of Gods

*special problem, implementation, two pointers

String Deletion

binary search, data structures, greedy, two pointers

Chess Cheater

greedy, implementation, sortings

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Flamingoes of Mystery

interactive

Arena of Greed

games, greedy

Lonely Numbers

binary search, math, number theory, two pointers

Bargain

combinatorics, dp, math

Palindromifier

constructive algorithms, strings

Rescue Nibel!

combinatorics, data structures, sortings

Sage's Birthday (hard version)

binary search, brute force, constructive algorithms, greedy, sortings, two pointers

Killjoy

greedy, implementation, math

Mortal Kombat Tower

dp, graphs, greedy, shortest paths

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Bouncing Ball

brute force, dp, implementation

Shurikens

data structures, greedy, implementation

Peaceful Rooks

dfs and similar, dsu, graphs

Two Platforms

binary search, dp, sortings, two pointers

Decrease the Sum of Digits

greedy, math

Discrete Acceleration

binary search, dp, implementation, math, two pointers

Arrays Sum

constructive algorithms, greedy, math

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Balanced Bitstring

implementation, strings

Fancy Fence

*special problem, data structures, dsu, implementation, math, sortings

Maximum Distributed Tree

dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees