XOR Inverse

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

Trash Problem

data structures, implementation

Divide by Three

dp, greedy, math, number theory

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

Nearest Beautiful Number (hard version)

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

Finding Zero

constructive algorithms, interactive, math

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Danil and a Part-time Job

bitmasks, data structures, trees

Empty Graph

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

Passable Paths (hard version)

data structures, dfs and similar, trees

Subsequences of Length Two

dp, strings

Weakness and Poorness

ternary search

Nastia and a Hidden Permutation

constructive algorithms, interactive

Binary Median

binary search, bitmasks, brute force, constructive algorithms

Swaps Again

constructive algorithms, implementation, sortings

Robot Collisions

data structures, greedy, implementation, sortings

The Strongest Build

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

Gift Set

binary search, greedy, math, ternary search

Buying Jewels

constructive algorithms, greedy, math

Cheap Dinner

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

Paths and Trees

graphs, greedy, shortest paths

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

GCD Counting

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

Accommodation

brute force, dp, greedy, implementation

CGCDSSQ

brute force, data structures, math

Chocolate Bar

brute force, dp

New Year Concert

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

K-beautiful Strings

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

Pokémon Army (hard version)

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

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Little Pony and Harmony Chest

bitmasks, brute force, dp

Omkar and Medians

data structures, greedy, implementation

The BOSS Can Count Pairs

brute force, math

Wonder Room

brute force, math

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

Xor-Paths

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

Count Good Substrings

math

Keep the Average High

dp, greedy, math

For Gamers. By Gamers.

binary search, brute force, greedy, math, sortings

Remainder Problem

brute force, data structures, implementation

String Coloring (hard version)

data structures, dp

Restorer Distance

binary search, greedy, math, sortings, ternary search

Kalila and Dimna in the Logging Industry

dp, geometry

GCD of an Array

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

The Door Problem

2-sat, dfs and similar, dsu, graphs

Round Subset

dp, math

Minimizing Difference

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

Weights Distributing

brute force, graphs, greedy, shortest paths, sortings

Pair of Numbers

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

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

505

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

Coloring Edges

constructive algorithms, dfs and similar, graphs

Generate a String

dfs and similar, dp

Chip Move

brute force, dp, math

Crazy Robot

dfs and similar, graphs

GCD and MST

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

Buy a Ticket

data structures, graphs, shortest paths

Number of Subsequences

combinatorics, dp, strings

Square Subsets

bitmasks, combinatorics, dp, math

Police Stations

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

Civilization

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

New Year Tree

bitmasks, data structures, trees

XOR-gun

bitmasks, brute force, constructive algorithms

Omkar and Circle

brute force, dp, games, greedy

Errich-Tac-Toe (Easy Version)

constructive algorithms, math

Appleman and Tree

dfs and similar, dp, trees

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Ancient Berland Circus

geometry, math

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

The Number of Pairs

dp, math, number theory

Red-Green Towers

dp

The Hard Work of Paparazzi

dp

Array Shrinking

dp, greedy

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Domino for Young

dp, greedy, math

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Modular Stability

combinatorics, math, number theory

Match Points

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

Connected Components?

data structures, dfs and similar, dsu, graphs

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Book of Evil

dfs and similar, divide and conquer, dp, trees

Not So Simple Polygon Embedding

binary search, brute force, geometry, math

Zero Remainder Sum

dp

Make Them Equal

constructive algorithms, greedy, math

Bertown roads

dfs and similar, graphs

Blood Cousins

binary search, data structures, dfs and similar, trees

Propagating tree

data structures, dfs and similar, trees

Captain Flint and Treasure

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

Breaking the Wall

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

A and B and Lecture Rooms

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

SUM and REPLACE

brute force, data structures, dsu, number theory

Another Array Problem

brute force, constructive algorithms, greedy

Reachability from the Capital

dfs and similar, graphs, greedy

Watto and Mechanism

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

Tree Shuffling

dfs and similar, dp, greedy, trees

Max Median

binary search, data structures, dp