Three Minimums

combinatorics, constructive algorithms, divide and conquer, dp, fft, math

Dušan's Railway

divide and conquer, graphs, trees

Strange Covering

divide and conquer

Balance the Cards

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

Speckled Band

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

Journey

data structures, divide and conquer, graphs, trees

Hard Cut

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

Gregor and the Two Painters

data structures, divide and conquer, graphs, greedy, math

Stairs

combinatorics, divide and conquer, dp, fft, math

Test Data Generation

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

Iqea

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

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Oleg and chess

data structures, divide and conquer, flows, graph matchings

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Egg Roulette

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

Special Positions

combinatorics, divide and conquer, fft, math

Omkar and Tours

data structures, divide and conquer, sortings, trees

Set Merging

constructive algorithms, divide and conquer

Verifying Kingdom

binary search, divide and conquer, interactive, trees

Alesya and Discrete Math

divide and conquer, interactive

Air Reform

data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees

Invertation in Tournament

brute force, divide and conquer, graphs, math

Raining season

data structures, divide and conquer, trees

Try Booking

data structures, divide and conquer

PolandBall and Many Other Balls

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

Xor-Set

bitmasks, divide and conquer, math

Tavas on the Path

data structures, divide and conquer, trees

Surprise me!

divide and conquer, math, number theory, trees

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Algoland and Berland

constructive algorithms, divide and conquer, geometry

Wizards and Roads

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

Reindeer Games

binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Yet Another Partiton Problem

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

Finding lines

constructive algorithms, divide and conquer, interactive

Bear and Cavalry

data structures, divide and conquer, dp

Julia the snail

data structures, divide and conquer, dp

Empty Rectangles

divide and conquer, two pointers

Artistic Partition

divide and conquer, dp, number theory

Keep XOR Low

bitmasks, combinatorics, data structures, divide and conquer, dp, math

Quick Tortoise

bitmasks, divide and conquer, dp

Freezing with Style

binary search, data structures, divide and conquer, trees

Logistical Questions

dfs and similar, divide and conquer, trees

Pastoral Oddities

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

Pudding Monsters

data structures, divide and conquer

Tree or not Tree

data structures, divide and conquer, implementation, trees

Cycles in product

combinatorics, divide and conquer, trees

Fox And Polygon

constructive algorithms, divide and conquer

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

Subsequence

brute force, divide and conquer, dp, greedy, trees

XOR and Distance

bitmasks, divide and conquer, trees

Fairy

dfs and similar, divide and conquer, dsu

Perfect Matching

data structures, divide and conquer, interactive, trees

Nikita and game

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

Inverse Genealogy

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

Joker

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

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Chess Strikes Back (hard version)

data structures, divide and conquer

Random Elections

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

Decinc Dividing

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

Sherlock's bet to Moriarty

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

Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Raging Thunder

data structures, divide and conquer, implementation

Battalion Strength

data structures, divide and conquer, probabilities

Parking Lot

data structures, divide and conquer

Interesting Sections

data structures, divide and conquer, meet-in-the-middle, two pointers

Serious Business

data structures, divide and conquer, dp, implementation, shortest paths

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

Yura and Developers

data structures, divide and conquer

Sum

data structures, divide and conquer, dp, greedy

Kingdom and its Cities

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

Double Tree

data structures, divide and conquer, shortest paths, trees

Omkar and Modes

binary search, divide and conquer, interactive

The Final Pursuit

bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math

Jumping Around

binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths

Number Clicker

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

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

New Year Shopping

divide and conquer, dp

Permutation

data structures, divide and conquer, hashing

X-OR

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

Close Vertices

data structures, divide and conquer, trees

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Vowels

combinatorics, divide and conquer, dp

Blue and Red of Our Faculty!

divide and conquer, dp

Doe Graphs

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

Formurosa

divide and conquer, dp, expression parsing

Lenient Vertex Cover

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

Forced Online Queries Problem

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

Sonya and Bitwise OR

bitmasks, data structures, divide and conquer

Divisor Set

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

Tree Coloring

combinatorics, divide and conquer, fft

Find a car

combinatorics, divide and conquer, dp

Pawns

data structures, divide and conquer, greedy

Extending Set of Points

data structures, divide and conquer, dsu

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Song of the Sirens

combinatorics, divide and conquer, hashing, math, string suffix structures, strings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Goodbye Souvenir

data structures, divide and conquer

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices