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

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Binary Table

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

Bear and Bowling 4

binary search, data structures, divide and conquer, geometry, ternary search

Magic Matrix

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

Thief in a Shop

divide and conquer, dp, fft, math

Package Delivery

data structures, divide and conquer, greedy

Kingdom and its Cities

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

Pastoral Oddities

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

Points on Plane

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

Bear and Cavalry

data structures, divide and conquer, dp

Logistical Questions

dfs and similar, divide and conquer, trees

Equivalent Strings

divide and conquer, hashing, sortings, strings

Yura and Developers

data structures, divide and conquer

Tavas on the Path

data structures, divide and conquer, trees

Pudding Monsters

data structures, divide and conquer

Permutations

bitmasks, divide and conquer, math

Fox And Polygon

constructive algorithms, divide and conquer

New Year Shopping

divide and conquer, dp

Parking Lot

data structures, divide and conquer

Pashmak and Parmida's problem

data structures, divide and conquer, sortings

Permutation

data structures, divide and conquer, hashing

Painting Fence

divide and conquer, dp, greedy

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Tricky Function

data structures, divide and conquer, geometry

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Maze 2D

data structures, divide and conquer

Vowels

combinatorics, divide and conquer, dp

New Year Tree

data structures, divide and conquer, trees

Counting Rectangles is Fun

brute force, divide and conquer, dp

Empty Rectangles

divide and conquer, two pointers

Pumping Stations

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

Xenia and Tree

data structures, divide and conquer, trees

Book of Evil

dfs and similar, divide and conquer, dp, trees

Ciel and Gondolas

data structures, divide and conquer, dp

Ciel the Commander

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

Close Vertices

data structures, divide and conquer, trees

Practice

constructive algorithms, divide and conquer, implementation

Quick Tortoise

bitmasks, divide and conquer, dp

Doe Graphs

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

Formurosa

divide and conquer, dp, expression parsing

Paint Tree

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

Wizards and Roads

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

Abracadabra

divide and conquer

Freezing with Style

binary search, data structures, divide and conquer, trees

Minimum Sum

divide and conquer, geometry, sortings

Tree or not Tree

data structures, divide and conquer, implementation, trees

Not Quick Transformation

divide and conquer, math

Candies and Stones

divide and conquer, dp

Superset

constructive algorithms, divide and conquer

Half-decay tree

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

Fairy

dfs and similar, divide and conquer, dsu

How many trees?

combinatorics, divide and conquer, dp