XOR Inverse

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

Two Different

constructive algorithms, divide and conquer

Clear the Multiset

data structures, divide and conquer, dp, greedy

Joker

*special problem, bitmasks, data structures, divide and conquer, dsu

a-Good String

bitmasks, brute force, divide and conquer, dp, implementation

Chess Strikes Back (hard version)

data structures, divide and conquer

Inverse Genealogy

constructive algorithms, divide and conquer, dp, math, trees

Set Merging

constructive algorithms, divide and conquer

Pawns

data structures, divide and conquer, greedy

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Omkar and Modes

binary search, divide and conquer, interactive

Raging Thunder

data structures, divide and conquer, implementation

X-OR

bitmasks, constructive algorithms, divide and conquer, interactive, probabilities

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

Journey

data structures, divide and conquer, graphs, trees

Battalion Strength

data structures, divide and conquer, probabilities

Moving Points

data structures, divide and conquer, implementation, sortings

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Permutation Separation

data structures, divide and conquer

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Tests for problem D

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

Invertation in Tournament

brute force, divide and conquer, graphs, math

Xor-Set

bitmasks, divide and conquer, math

Divisor Set

divide and conquer, fft, greedy, math, number theory

SmartGarden

constructive algorithms, divide and conquer

Balanced Removals (Harder)

binary search, constructive algorithms, divide and conquer, greedy, implementation, sortings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Product Tuples

divide and conquer, fft

Xor Spanning Tree

divide and conquer, fft, graphs

Forced Online Queries Problem

data structures, divide and conquer, dsu, graphs, trees

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Dynamic Diameter

*special problem, data structures, dfs and similar, divide and conquer, trees

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Vus the Cossack and a Field

divide and conquer, implementation, math

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Alesya and Discrete Math

divide and conquer, interactive

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Lost Numbers

brute force, divide and conquer, interactive, math

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

0-1-Tree

dfs and similar, divide and conquer, dp, dsu, trees

Beautiful Array

brute force, data structures, divide and conquer, dp, greedy

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Double Tree

data structures, divide and conquer, shortest paths, trees

Extending Set of Points

data structures, divide and conquer, dsu

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Dish Shopping

data structures, divide and conquer

Please, another Queries on Array?

bitmasks, data structures, divide and conquer, math, number theory

Creative Snap

binary search, brute force, divide and conquer, math

Ivan and Burgers

data structures, divide and conquer, greedy, math

Lucky Tickets

divide and conquer, dp, fft

Algoland and Berland

constructive algorithms, divide and conquer, geometry

Speckled Band

data structures, divide and conquer, hashing, string suffix structures, strings

Petya and Array

data structures, divide and conquer, two pointers

Ray in the tube

data structures, divide and conquer, dp, math

Raining season

data structures, divide and conquer, trees

Sonya and Bitwise OR

bitmasks, data structures, divide and conquer

One Occurrence

data structures, divide and conquer

Cycles in product

combinatorics, divide and conquer, trees

Number Clicker

divide and conquer, graphs, meet-in-the-middle, number theory

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

Iqea

data structures, dfs and similar, divide and conquer, dsu, shortest paths, trees

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Maximum Subsequence

bitmasks, divide and conquer, meet-in-the-middle

High Cry

binary search, bitmasks, combinatorics, data structures, divide and conquer

Merge Sort

constructive algorithms, divide and conquer

Yet Another Minimization Problem

divide and conquer, dp

Egg Roulette

bitmasks, brute force, divide and conquer, math, meet-in-the-middle

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Random Elections

bitmasks, brute force, divide and conquer, fft, math

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Goodbye Souvenir

data structures, divide and conquer

Nikita and game

binary search, dfs and similar, divide and conquer, graphs, trees

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

The Bakery

binary search, data structures, divide and conquer, dp, two pointers

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Surprise me!

divide and conquer, math, number theory, trees

Find a car

combinatorics, divide and conquer, dp

Oleg and chess

data structures, divide and conquer, flows, graph matchings

Julia the snail

data structures, divide and conquer, dp

Finding lines

constructive algorithms, divide and conquer, interactive

Till I Collapse

data structures, divide and conquer

Sherlock's bet to Moriarty

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation, trees

Test Data Generation

combinatorics, divide and conquer, dp, fft, math, number theory

Verifying Kingdom

binary search, divide and conquer, interactive, trees

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Timofey and our friends animals

data structures, divide and conquer, dsu

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

PolandBall and Many Other Balls

combinatorics, divide and conquer, dp, fft, math, number theory

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Hongcow's Game

bitmasks, divide and conquer, interactive

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Lena and Queries

data structures, divide and conquer, geometry