Speckled Band

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

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Test Data Generation

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

Egg Roulette

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

Iqea

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

Alesya and Discrete Math

divide and conquer, interactive

Verifying Kingdom

binary search, divide and conquer, interactive, trees

Raining season

data structures, divide and conquer, trees

Algoland and Berland

constructive algorithms, divide and conquer, geometry

Oleg and chess

data structures, divide and conquer, flows, graph matchings

Invertation in Tournament

brute force, divide and conquer, graphs, math

Xor-Set

bitmasks, divide and conquer, math

Tavas on the Path

data structures, divide and conquer, trees

PolandBall and Many Other Balls

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

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Nikita and game

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

Empty Rectangles

divide and conquer, two pointers

Logistical Questions

dfs and similar, divide and conquer, trees

Freezing with Style

binary search, data structures, divide and conquer, trees

Surprise me!

divide and conquer, math, number theory, trees

Wizards and Roads

data structures, divide and conquer, graph matchings, graphs, greedy

Finding lines

constructive algorithms, divide and conquer, interactive

Julia the snail

data structures, divide and conquer, dp

Double Tree

data structures, divide and conquer, shortest paths, trees

Bear and Cavalry

data structures, divide and conquer, dp

Sonya and Bitwise OR

bitmasks, data structures, divide and conquer

Quick Tortoise

bitmasks, divide and conquer, dp

Pastoral Oddities

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

Find a car

combinatorics, divide and conquer, dp

Pudding Monsters

data structures, divide and conquer

Tree or not Tree

data structures, divide and conquer, implementation, trees

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Random Elections

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

Dish Shopping

data structures, divide and conquer

Fox And Polygon

constructive algorithms, divide and conquer

Forced Online Queries Problem

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

Cycles in product

combinatorics, divide and conquer, trees

Battalion Strength

data structures, divide and conquer, probabilities

Timofey and our friends animals

data structures, divide and conquer, dsu

Pumping Stations

brute force, dfs and similar, divide and conquer, flows, graphs, greedy, trees

Parking Lot

data structures, divide and conquer

Goodbye Souvenir

data structures, divide and conquer

Fairy

dfs and similar, divide and conquer, dsu

Kingdom and its Cities

dfs and similar, divide and conquer, dp, graphs, sortings, trees

Binary Table

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

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Yet Another Partiton Problem

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

Doe Graphs

constructive algorithms, divide and conquer, dp, graphs, shortest paths

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Sherlock's bet to Moriarty

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

SmartGarden

constructive algorithms, divide and conquer

Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Divisor Set

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

Number Clicker

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

Extending Set of Points

data structures, divide and conquer, dsu

Yura and Developers

data structures, divide and conquer

Close Vertices

data structures, divide and conquer, trees

Vowels

combinatorics, divide and conquer, dp

Xor Spanning Tree

divide and conquer, fft, graphs

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Lena and Queries

data structures, divide and conquer, geometry

New Year Shopping

divide and conquer, dp

Permutation

data structures, divide and conquer, hashing

The Number of Subpermutations

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

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Ivan and Burgers

data structures, divide and conquer, greedy, math

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Till I Collapse

data structures, divide and conquer

Ciel and Gondolas

data structures, divide and conquer, dp

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Product Tuples

divide and conquer, fft

Formurosa

divide and conquer, dp, expression parsing

Vus the Cossack and a Field

divide and conquer, implementation, math

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Yet Another Minimization Problem

divide and conquer, dp

Please, another Queries on Array?

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

Thief in a Shop

divide and conquer, dp, fft, math

Ciel the Commander

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

Half-decay tree

data structures, divide and conquer, dp, math, probabilities

Not Quick Transformation

divide and conquer, math

Candies and Stones

divide and conquer, dp

Magic Matrix

brute force, divide and conquer, graphs, matrices, trees

Abracadabra

divide and conquer

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Paint Tree

constructive algorithms, divide and conquer, geometry, sortings, trees

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Lucky Tickets

divide and conquer, dp, fft

GCD Counting

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

Ray in the tube

data structures, divide and conquer, dp, math

One Occurrence

data structures, divide and conquer

New Year Tree

data structures, divide and conquer, trees

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Superset

constructive algorithms, divide and conquer

Ehab and the Big Finale

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

Package Delivery

data structures, divide and conquer, greedy

0-1-Tree

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

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Alternating Tree

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