Sereja and Brackets

data structures, schedules

The least round way

dp, math

Engineer Artem

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

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

XOR on Segment

bitmasks, data structures

Prefixes and Suffixes

dp, string suffix structures, strings, two pointers

Jzzhu and Cities

graphs, greedy, shortest paths

Orac and Medians

constructive algorithms, greedy, math

Ant colony

data structures, math, number theory

The Football Season

brute force, math, number theory

Tree Painting

dfs and similar, dp, trees

Clear the String

dp

Ice Cave

dfs and similar

Minimum spanning tree for each edge

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

Compress Words

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

Directing Edges

constructive algorithms, dfs and similar, graphs

Maximum Value

binary search, math, sortings, two pointers

Ciel the Commander

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

Max Median

binary search, data structures, dp

Minimax Problem

binary search, bitmasks, dp

Tree Shuffling

dfs and similar, dp, greedy, trees

Watto and Mechanism

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

Reachability from the Capital

dfs and similar, graphs, greedy

Another Array Problem

brute force, constructive algorithms, greedy

SUM and REPLACE

brute force, data structures, dsu, number theory

A and B and Lecture Rooms

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

Breaking the Wall

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

Captain Flint and Treasure

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

Propagating tree

data structures, dfs and similar, trees

Blood Cousins

binary search, data structures, dfs and similar, trees

Bertown roads

dfs and similar, graphs

Make Them Equal

constructive algorithms, greedy, math

Match Points

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

Zero Remainder Sum

dp

Not So Simple Polygon Embedding

binary search, brute force, geometry, math

Book of Evil

dfs and similar, divide and conquer, dp, trees

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Connected Components?

data structures, dfs and similar, dsu, graphs

Modular Stability

combinatorics, math, number theory

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Domino for Young

dp, greedy, math

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Array Shrinking

dp, greedy

The Hard Work of Paparazzi

dp

The Number of Pairs

dp, math, number theory

Red-Green Towers

dp

Water Tree

data structures, dfs and similar, graphs, trees

Choosing flowers

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

Ancient Berland Circus

geometry, math

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Appleman and Tree

dfs and similar, dp, trees

Errich-Tac-Toe (Easy Version)

constructive algorithms, math

Omkar and Circle

brute force, dp, games, greedy

New Year Tree

bitmasks, data structures, trees

XOR-gun

bitmasks, brute force, constructive algorithms

Police Stations

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

Civilization

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

Square Subsets

bitmasks, combinatorics, dp, math

Number of Subsequences

combinatorics, dp, strings

GCD and MST

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

Buy a Ticket

data structures, graphs, shortest paths

Crazy Robot

dfs and similar, graphs

Chip Move

brute force, dp, math

Generate a String

dfs and similar, dp

Coloring Edges

constructive algorithms, dfs and similar, graphs

505

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

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Pair of Numbers

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

Weights Distributing

brute force, graphs, greedy, shortest paths, sortings

Minimizing Difference

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

Round Subset

dp, math

The Door Problem

2-sat, dfs and similar, dsu, graphs

GCD of an Array

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

String Coloring (hard version)

data structures, dp

Remainder Problem

brute force, data structures, implementation

Kalila and Dimna in the Logging Industry

dp, geometry

Restorer Distance

binary search, greedy, math, sortings, ternary search

For Gamers. By Gamers.

binary search, brute force, greedy, math, sortings

Keep the Average High

dp, greedy, math

Count Good Substrings

math

Xor-Paths

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

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Wonder Room

brute force, math

The BOSS Can Count Pairs

brute force, math

Omkar and Medians

data structures, greedy, implementation

Little Pony and Harmony Chest

bitmasks, brute force, dp

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Pokémon Army (hard version)

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

Buying Jewels

constructive algorithms, greedy, math

New Year Concert

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

K-beautiful Strings

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

Chocolate Bar

brute force, dp

CGCDSSQ

brute force, data structures, math

Accommodation

brute force, dp, greedy, implementation

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

GCD Counting

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