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

The Football Season

brute force, math, number theory

Clear the String

dp

Ice Cave

dfs and similar

Compress Words

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

Directing Edges

constructive algorithms, dfs and similar, graphs

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

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

Bertown roads

dfs and similar, graphs

Make Them Equal

constructive algorithms, greedy, math

Match Points

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

Book of Evil

dfs and similar, divide and conquer, dp, trees

Not So Simple Polygon Embedding

binary search, brute force, geometry, math

Monopole Magnets

constructive algorithms, 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

Red-Green Towers

dp

The Hard Work of Paparazzi

dp

Choosing flowers

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

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Appleman and Tree

dfs and similar, dp, trees

Buy a Ticket

data structures, graphs, shortest paths

XOR-gun

bitmasks, brute force, constructive algorithms

Square Subsets

bitmasks, combinatorics, dp, math

Number of Subsequences

combinatorics, dp, strings

GCD and MST

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

Crazy Robot

dfs and similar, graphs

Chip Move

brute force, dp, math

Generate a String

dfs and similar, dp

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

The Door Problem

2-sat, dfs and similar, dsu, graphs

Minimizing Difference

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

String Coloring (hard version)

data structures, dp

For Gamers. By Gamers.

binary search, brute force, greedy, math, sortings

Keep the Average High

dp, greedy, math

Buying Jewels

constructive algorithms, greedy, math

Count Good Substrings

math

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

Chocolate Bar

brute force, dp

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

CGCDSSQ

brute force, data structures, 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

Accommodation

brute force, dp, greedy, implementation

GCD Counting

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

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Paths and Trees

graphs, greedy, shortest paths

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Cheap Dinner

brute force, data structures, graphs, greedy, implementation, sortings, two pointers

The Strongest Build

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

Robot Collisions

data structures, greedy, implementation, sortings

Passable Paths (hard version)

data structures, dfs and similar, trees

Weakness and Poorness

ternary search

Nastia and a Hidden Permutation

constructive algorithms, interactive

Empty Graph

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

Danil and a Part-time Job

bitmasks, data structures, trees

Finding Zero

constructive algorithms, interactive, math

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Divide by Three

dp, greedy, math, number theory

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

Different Arrays

brute force, dp, implementation

XOR Inverse

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

Wish I Knew How to Sort

dp, math, probabilities

Searchlights

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

Pairs of Segments

data structures, greedy, sortings, two pointers

Fire

dp, sortings

R2D2 and Droid Army

binary search, data structures, two pointers

The Contest

data structures, dp, greedy

Pair Of Lines

geometry

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

Cut and Stick

binary search, data structures, greedy, implementation, sortings

Counting Graphs

combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees

Array Queries

brute force, data structures, dp

Big Brush

constructive algorithms, data structures, greedy, implementation

Increasing Frequency

binary search, dp, greedy