Three Minimums

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

Dušan's Railway

divide and conquer, graphs, trees

Egg Roulette

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

Algoland and Berland

constructive algorithms, divide and conquer, geometry

Strange Covering

divide and conquer

Balance the Cards

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

Verifying Kingdom

binary search, divide and conquer, interactive, trees

Alesya and Discrete Math

divide and conquer, interactive

Hard Cut

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

Gregor and the Two Painters

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

Speckled Band

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

Journey

data structures, divide and conquer, graphs, trees

Stairs

combinatorics, divide and conquer, dp, fft, math

Test Data Generation

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

Special Positions

combinatorics, divide and conquer, fft, math

Iqea

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

Wizards and Roads

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

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Omkar and Tours

data structures, divide and conquer, sortings, trees

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

Air Reform

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

Tree or not Tree

data structures, divide and conquer, implementation, trees

Blue and Red of Our Faculty!

divide and conquer, dp

Yet Another Partiton Problem

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

Oleg and chess

data structures, divide and conquer, flows, graph matchings

Perfect Matching

data structures, divide and conquer, interactive, trees

Xor-Set

bitmasks, divide and conquer, math

Doe Graphs

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

Xor Spanning Tree

divide and conquer, fft, graphs

Nikita and game

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

Finding lines

constructive algorithms, divide and conquer, interactive

Invertation in Tournament

brute force, divide and conquer, graphs, math

Tavas on the Path

data structures, divide and conquer, trees

Raining season

data structures, divide and conquer, trees

Set Merging

constructive algorithms, divide and conquer

Inverse Genealogy

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

Joker

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

Formurosa

divide and conquer, dp, expression parsing

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Product Tuples

divide and conquer, fft

Chess Strikes Back (hard version)

data structures, divide and conquer

Double Tree

data structures, divide and conquer, shortest paths, trees

Bear and Cavalry

data structures, divide and conquer, dp

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Lenient Vertex Cover

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

Dish Shopping

data structures, divide and conquer

Not Quick Transformation

divide and conquer, math

Random Elections

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

SmartGarden

constructive algorithms, divide and conquer

Omkar and Modes

binary search, divide and conquer, interactive

Try Booking

data structures, divide and conquer

Julia the snail

data structures, divide and conquer, dp

Decinc Dividing

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

The Final Pursuit

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

Sherlock's bet to Moriarty

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

Empty Rectangles

divide and conquer, two pointers

Artistic Partition

divide and conquer, dp, number theory

Cycles in product

combinatorics, divide and conquer, trees

Candies and Stones

divide and conquer, dp

Half-decay tree

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

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Fox And Polygon

constructive algorithms, divide and conquer

Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Forced Online Queries Problem

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

Timofey and our friends animals

data structures, divide and conquer, dsu

Virus

data structures, divide and conquer, dsu, graphs

Raging Thunder

data structures, divide and conquer, implementation

Battalion Strength

data structures, divide and conquer, probabilities

Keep XOR Low

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

Parking Lot

data structures, divide and conquer

Sonya and Bitwise OR

bitmasks, data structures, divide and conquer

Jumping Around

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

Quick Tortoise

bitmasks, divide and conquer, dp

Divisor Set

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

Number Clicker

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

Freezing with Style

binary search, data structures, divide and conquer, trees

Tree Coloring

combinatorics, divide and conquer, fft

Pumping Stations

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

Interesting Sections

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

Subsequence

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

Maze 2D

data structures, divide and conquer

XOR and Distance

bitmasks, divide and conquer, trees

Vus the Cossack and a Field

divide and conquer, implementation, math

Logistical Questions

dfs and similar, divide and conquer, trees

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

New Year Shopping

divide and conquer, dp

Surprise me!

divide and conquer, math, number theory, trees

Serious Business

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

Abracadabra

divide and conquer

Anti-Theft Road Planning

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

PolandBall and Many Other Balls

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

Dynamic Diameter

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

Lena and Queries

data structures, divide and conquer, geometry

Find a car

combinatorics, divide and conquer, dp

Pawns

data structures, divide and conquer, greedy

Minimal String Xoration

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

Pastoral Oddities

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

Superset

constructive algorithms, divide and conquer

Yura and Developers

data structures, divide and conquer