Unstable String

binary search, dp, greedy, implementation, strings, two pointers

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Kavi on Pairing Duty

combinatorics, dp, math

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

Sequence Pair Weight

hashing, implementation, math

Potions (Hard Version)

data structures, greedy

Potions (Easy Version)

brute force, data structures, dp, greedy

I Hate 1111

dp, math, number theory

Compression and Expansion

brute force, data structures, greedy, implementation, trees

Nastia and a Good Array

constructive algorithms, math, number theory

Guess the K-th Zero (Easy version)

binary search, interactive

Arranging The Sheep

greedy, math

Maximum Sum of Products

brute force, dp, implementation, math, two pointers

Berland Regional

brute force, data structures, greedy, number theory, sortings

Fillomino 2

constructive algorithms, dfs and similar, greedy, implementation

Baby Ehab Partitions Again

bitmasks, constructive algorithms, dp, math

AGAGA XOOORRR

bitmasks, brute force, dp, greedy

Phoenix and Socks

greedy, sortings, two pointers

Phoenix and Towers

constructive algorithms, data structures, greedy

Product 1 Modulo N

greedy, number theory

Add One

dp, matrices

AND Sequences

bitmasks, combinatorics, constructive algorithms, math

Short Task

brute force, dp, math, number theory

Permutation by Sum

brute force, greedy, math

Min Cost String

brute force, constructive algorithms, graphs, greedy, strings

Restoring the Permutation

constructive algorithms, implementation

Epic Transformation

constructive algorithms, data structures, greedy

Fibonacci Words

*special problem, implementation

DMCA

*special problem, implementation, number theory

3-Coloring

constructive algorithms, games, interactive

Balance the Bits

constructive algorithms, greedy

Minimum Grid Path

brute force, data structures, greedy, math

Planar Reflections

brute force, data structures, dp

Box Fitting

binary search, bitmasks, data structures, greedy

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

Planet Lapituletti

brute force, implementation

Maximum width

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

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

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

Journey

dfs and similar, dp, dsu, implementation

Longest Simple Cycle

dp, graphs, greedy

Inflation

binary search, brute force, greedy, math

Advertising Agency

combinatorics, math, sortings

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

Strange Birthday Party

binary search, dp, greedy, 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

Full Turn

geometry, hashing, number theory

Firecrackers

binary search, sortings

Berpizza

data structures, implementation

Hills And Valleys

brute force, implementation

13th Labour of Heracles

data structures, greedy, sortings, trees

Canine poetry

dp, greedy, strings

Find The Array

bitmasks, constructive algorithms, 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

Move and Turn

dp, math

Row GCD

math, number theory

Sequence and Swaps

dp, greedy, sortings

Number into Sequence

constructive algorithms, math, number theory

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

Knapsack

constructive algorithms, greedy, sortings

Division

brute force, math, number theory

The Delivery Dilemma

binary search, greedy, sortings

Saving the City

dp, greedy, math, sortings

Binary Table (Easy Version)

constructive algorithms, implementation

Minimal Height Tree

graphs, greedy, shortest paths, trees

Binary Search

binary search, combinatorics

Two Round Dances

combinatorics, math

Used Markers

*special problem, greedy

Black Friday

*special problem, implementation

Polycarp and the Language of Gods

*special problem, implementation, two pointers