Score of a Tree

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

Two Chess Pieces

dfs and similar, dp, greedy, trees

Ice and Fire

constructive algorithms, dp, greedy

Hossam and Friends

binary search, constructive algorithms, dp, two pointers

Игра в Девятку I

*special problem, brute force, dp

Подкрутка II

*special problem, dp

Подкрутка I

*special problem, brute force, dp, greedy

Playoff

combinatorics, constructive algorithms, dp, greedy, math

Hamiltonian Wall

dp, implementation

Doremy's Pegging Game

combinatorics, dp, math

The Humanoid

brute force, dp, sortings

Wish I Knew How to Sort

dp, math, probabilities

Make Nonzero Sum (hard version)

constructive algorithms, dp, greedy

Make Nonzero Sum (easy version)

constructive algorithms, dp, greedy

Counting Arrays

combinatorics, dp, math, number theory

Zero-Sum Prefixes

brute force, data structures, dp, greedy, implementation

Paths on the Tree

dfs and similar, dp, greedy, sortings, trees

Problem with Random Tests

brute force, dp, greedy, probabilities

Sending a Sequence Over the Network

dp

Hanging Hearts

constructive algorithms, data structures, dfs and similar, dp, greedy, trees

Card Game

combinatorics, constructive algorithms, dp, games

Even Number Addicts

dp, games, greedy, math

Slime Escape

data structures, dp, greedy, two pointers

Zero-One (Hard Version)

dp, greedy

Graph Cost

dp, greedy, math, number theory

Valiant's New Map

binary search, brute force, data structures, dp, two pointers

Letter Picking

constructive algorithms, dp, games, two pointers

Moving Both Hands

dp, graphs, shortest paths

Counting Rectangles

brute force, data structures, dp, implementation

Xor-Subsequence (easy version)

bitmasks, brute force, dp, strings, trees, two pointers

Burenka and Traditions (hard version)

data structures, dp, greedy

Burenka and Traditions (easy version)

dp, greedy

Chip Move

brute force, dp, math

Robot in a Hallway

data structures, dp, greedy, implementation, ternary search

Color with Occurrences

brute force, data structures, dp, greedy, strings

Build Permutation

constructive algorithms, dp, math

Qpwoeirut And The City

dp, flows, greedy, implementation

Good Key, Bad Key

bitmasks, brute force, dp, greedy, math

Yet Another Problem About Pairs Satisfying an Inequality

binary search, data structures, dp, greedy, sortings

River Locks

binary search, dp, greedy, math

Zero Path

brute force, data structures, dp, graphs, greedy, shortest paths

Fake Plastic Trees

dfs and similar, dp, greedy, trees

Gambling

data structures, dp, greedy, math

2^Sort

data structures, dp, sortings, two pointers

Lena and Matrix

data structures, dp, geometry, shortest paths

Infected Tree

dfs and similar, dp, trees

Required Length

brute force, dfs and similar, dp, hashing, shortest paths

Moving Chips

bitmasks, dp, greedy

Toss a Coin to Your Graph...

binary search, dfs and similar, dp, graphs

Tokitsukaze and Good 01-String (hard version)

dp, greedy, implementation

Tokitsukaze and Strange Inequality

brute force, data structures, dp

White-Black Balanced Subtrees

dfs and similar, dp, graphs, trees

Vlad and Unfinished Business

dfs and similar, dp, greedy, trees

Remove Directed Edges

dfs and similar, dp, graphs

Palindrome Basis

brute force, dp, math, number theory

Getting Zero

bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths

Get an Even String

dp, greedy, strings

Line Empire

binary search, brute force, dp, greedy, implementation, math

Madoka and the Best School in Russia

constructive algorithms, dp, math, number theory

Weight the Tree

constructive algorithms, dfs and similar, dp, implementation, trees

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

Increase Subarray Sums

brute force, dp, greedy, implementation

Yet Another Minimization Problem

dp, greedy, math

Infinite Set

bitmasks, dp, math, matrices, number theory, strings

Make Them Equal

dp, greedy

Strange Test

binary search, bitmasks, brute force, dp, math

Not Adding

brute force, dp, math, number theory

Monsters And Spells

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

Road Optimization

dp

Masha-forgetful

brute force, constructive algorithms, dp, hashing, implementation, strings

BA-String

brute force, dp, greedy, implementation, math

MEX and Increments

constructive algorithms, data structures, dp, greedy, implementation, math, sortings

Array and Operations

dp, greedy, math

Keep the Average High

dp, greedy, math

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

MEX Sequences

dp, math

Messages

brute force, dp, greedy, probabilities, sortings

Escape The Maze (hard version)

dfs and similar, dp, greedy, shortest paths, trees

Not Quite Lee

combinatorics, dp, math, number theory

Complex Market Analysis

binary search, dp, implementation, number theory, schedules, two pointers

Game Master

data structures, dfs and similar, dp, graphs, greedy, two pointers

Frog Traveler

data structures, dfs and similar, dp, graphs, shortest paths, two pointers

Delete Two Elements

data structures, dp, implementation, math, two pointers

The Number of Imposters

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

Bakry and Partitioning

bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees

Omkar and Determination

data structures, dp

Korney Korneevich and XOR (easy version)

bitmasks, dp, greedy

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Portal

brute force, data structures, dp, greedy, implementation

Divisible by Twenty-Five

brute force, dfs and similar, dp

Book

binary search, brute force, data structures, dp, graphs, implementation, sortings

Kotlinforces

*special problem, constructive algorithms, dp

Fix the String

*special problem, bitmasks, dp, greedy

Carrying Conundrum

bitmasks, combinatorics, dp, math

Buds Re-hanging

constructive algorithms, dfs and similar, dp, greedy, trees

Two Hundred Twenty One (easy version)

data structures, dp, math

Up the Strip (simplified version)

brute force, data structures, dp, math, number theory

Up the Strip

brute force, dp, math, number theory, two pointers

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Say No to Palindromes

brute force, constructive algorithms, dp, strings