Paths and Trees

graphs, greedy, shortest paths

Square Subsets

bitmasks, combinatorics, dp, math

New Year Concert

binary search, data structures, greedy, math, number theory, two pointers

Finding Zero

constructive algorithms, interactive, math

GCD Counting

data structures, dfs and similar, dp, number theory, trees

The Contest

data structures, dp, greedy

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

Segment Intersections

brute force, greedy, implementation, math

Weakness and Poorness

ternary search

Subsequences of Length Two

dp, strings

Round Subset

dp, math

Chocolate Bar

brute force, dp

Sequence Sorting

dp, greedy, two pointers

Empty Graph

binary search, constructive algorithms, data structures, greedy, shortest paths

Buds Re-hanging

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

Divide by Three

dp, greedy, math, number theory

Cut and Stick

binary search, data structures, greedy, implementation, sortings

Fire

dp, sortings

Pair Of Lines

geometry

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

The Winter Hike

constructive algorithms, greedy, math

Big Brush

constructive algorithms, data structures, greedy, implementation

Nearest Beautiful Number (hard version)

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

CGCDSSQ

brute force, data structures, math

Danil and a Part-time Job

bitmasks, data structures, trees

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Two Arrays

binary search, brute force, combinatorics, constructive algorithms, dp, two pointers

Time to Run

constructive algorithms, graphs, implementation

Reducing Delivery Cost

brute force, graphs, shortest paths

Guess The Maximums

binary search, implementation, interactive, math

R2D2 and Droid Army

binary search, data structures, two pointers

Rarity and New Dress

dfs and similar, dp, implementation, shortest paths

Destroying Roads

constructive algorithms, graphs, shortest paths

Valid Sets

dfs and similar, dp, math, trees

Garland

dfs and similar, graphs, greedy, trees

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Robot in a Hallway

data structures, dp, greedy, implementation, ternary search

Balanced Playlist

binary search, data structures, implementation

Challenges in school №41

brute force, constructive algorithms, games, graphs, greedy, implementation, sortings

Yet Another Division Into Teams

dp, greedy, sortings

Babaei and Birthday Cake

data structures, dp

Case of Fugitive

data structures, greedy, sortings

Reverse

bitmasks, constructive algorithms, dfs and similar, implementation, math, strings

Remainder Problem

brute force, data structures, implementation

Ehab's Last Corollary

constructive algorithms, dfs and similar, graphs, greedy, implementation, trees

Hanoi Factory

brute force, data structures, dp, greedy, sortings

Roman and Numbers

bitmasks, brute force, combinatorics, dp, number theory

Present

binary search, bitmasks, constructive algorithms, data structures, math, sortings

Multipliers

math, number theory

Xor-Paths

bitmasks, brute force, dp, meet-in-the-middle

Exact Change

brute force, constructive algorithms, greedy

Repetitions Decoding

constructive algorithms, implementation, sortings

Cut

binary search, data structures, dp, graphs, number theory, two pointers

Magic Gems

dp, math, matrices

Masha-forgetful

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

Boring Segments

data structures, sortings, trees, two pointers

Number With The Given Amount Of Divisors

brute force, dp, number theory

Two Sets

2-sat, dfs and similar, dsu, graph matchings, greedy

Martial Arts Tournament

binary search, brute force, greedy, math

DZY Loves Modification

brute force, data structures, greedy

Array Partition

binary search, data structures, greedy, two pointers

Segment Tree

data structures, dsu, graphs, trees

Olya and Energy Drinks

data structures, dfs and similar, graphs, shortest paths

Money Transfers

constructive algorithms, data structures, greedy, sortings

Zero-One (Hard Version)

dp, greedy

Shuffle

combinatorics, math, two pointers

Passable Paths (hard version)

data structures, dfs and similar, trees

Water Balance

data structures, geometry, greedy

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Divisibility by 25

brute force, greedy

Height All the Same

combinatorics, constructive algorithms, math, matrices

Unshuffling a Deck

constructive algorithms, implementation

Ilya And The Tree

dfs and similar, graphs, math, number theory, trees

Placing Jinas

combinatorics, math

Anton and Tree

dfs and similar, dp, trees

Fixed Points

binary search, brute force, dp

Guess the Permutation

binary search, combinatorics, interactive, math

Array Queries

brute force, data structures, dp

Divan and Kostomuksha (easy version)

dp, number theory

Moving Chips

bitmasks, dp, greedy

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Increasing Frequency

binary search, dp, greedy

Glass Half Spilled

dp

GCD Guess

bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory

Soldier and Traveling

flows, graphs, math

Game with modulo

binary search, constructive algorithms, interactive

Edge Split

brute force, constructive algorithms, dfs and similar, dsu, graphs, probabilities, trees

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Strip

binary search, data structures, dp, two pointers

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Kamil and Making a Stream

math, number theory, trees

Different Arrays

brute force, dp, implementation

Equation

math

Lucky Common Subsequence

dp, strings

Permutation Shift

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

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Messenger Simulator

data structures

Decryption

constructive algorithms, implementation, math, number theory

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation