Sereja and Brackets

data structures, schedules

Engineer Artem

2-sat, chinese remainder theorem, constructive algorithms, fft, flows

The least round way

dp, math

Two Divisors

constructive algorithms, math, number theory

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Three Integers

brute force, math

Orac and Medians

constructive algorithms, greedy, math

The Football Season

brute force, math, number theory

Prefixes and Suffixes

dp, string suffix structures, strings, two pointers

XOR on Segment

bitmasks, data structures

Ice Cave

dfs and similar

Jzzhu and Cities

graphs, greedy, shortest paths

Maximum Value

binary search, math, sortings, two pointers

Ant colony

data structures, math, number theory

Tree Shuffling

dfs and similar, dp, greedy, trees

Directing Edges

constructive algorithms, dfs and similar, graphs

Minimax Problem

binary search, bitmasks, dp

Captain Flint and Treasure

data structures, dfs and similar, graphs, greedy, implementation, trees

Compress Words

brute force, hashing, implementation, string suffix structures, strings

Clear the String

dp

Tree Painting

dfs and similar, dp, trees

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Watto and Mechanism

binary search, data structures, hashing, string suffix structures, strings

Not So Simple Polygon Embedding

binary search, brute force, geometry, math

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Make Them Equal

constructive algorithms, greedy, math

Max Median

binary search, data structures, dp

Reachability from the Capital

dfs and similar, graphs, greedy

Minimum spanning tree for each edge

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

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Breaking the Wall

binary search, brute force, constructive algorithms, greedy, math

Domino for Young

dp, greedy, math

Modular Stability

combinatorics, math, number theory

Propagating tree

data structures, dfs and similar, trees

Zero Remainder Sum

dp

Omkar and Circle

brute force, dp, games, greedy

Bertown roads

dfs and similar, graphs

Red-Green Towers

dp

The Hard Work of Paparazzi

dp

SUM and REPLACE

brute force, data structures, dsu, number theory

Match Points

binary search, greedy, sortings, ternary search, two pointers

Another Array Problem

brute force, constructive algorithms, greedy

Errich-Tac-Toe (Easy Version)

constructive algorithms, math

A and B and Lecture Rooms

binary search, data structures, dfs and similar, dp, trees

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Book of Evil

dfs and similar, divide and conquer, dp, trees

Ancient Berland Circus

geometry, math

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Array Shrinking

dp, greedy

The Number of Pairs

dp, math, number theory

Civilization

dfs and similar, dp, dsu, ternary search, trees

Blood Cousins

binary search, data structures, dfs and similar, trees

Appleman and Tree

dfs and similar, dp, trees

XOR-gun

bitmasks, brute force, constructive algorithms

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Number of Subsequences

combinatorics, dp, strings

505

bitmasks, brute force, constructive algorithms, dp, greedy, implementation

Connected Components?

data structures, dfs and similar, dsu, graphs

Weights Distributing

brute force, graphs, greedy, shortest paths, sortings

Coloring Edges

constructive algorithms, dfs and similar, graphs

Generate a String

dfs and similar, dp

Water Tree

data structures, dfs and similar, graphs, trees

Crazy Robot

dfs and similar, graphs

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Pair of Numbers

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

Count Good Substrings

math

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

String Coloring (hard version)

data structures, dp

Wonder Room

brute force, math

For Gamers. By Gamers.

binary search, brute force, greedy, math, sortings

Police Stations

constructive algorithms, dfs and similar, dp, graphs, shortest paths, trees

Omkar and Medians

data structures, greedy, implementation

Buy a Ticket

data structures, graphs, shortest paths

The Door Problem

2-sat, dfs and similar, dsu, graphs

Restorer Distance

binary search, greedy, math, sortings, ternary search

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

Minimizing Difference

binary search, constructive algorithms, greedy, sortings, ternary search, two pointers

K-beautiful Strings

binary search, brute force, constructive algorithms, greedy, strings

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Chip Move

brute force, dp, math

Keep the Average High

dp, greedy, math

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Little Pony and Harmony Chest

bitmasks, brute force, dp

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

New Year Tree

bitmasks, data structures, trees

Nastia and a Hidden Permutation

constructive algorithms, interactive

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Binary Median

binary search, bitmasks, brute force, constructive algorithms

Kalila and Dimna in the Logging Industry

dp, geometry

Swaps Again

constructive algorithms, implementation, sortings

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Searchlights

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

Gift Set

binary search, greedy, math, ternary search

Robot Collisions

data structures, greedy, implementation, sortings

Trash Problem

data structures, implementation

Square Subsets

bitmasks, combinatorics, dp, math