Three Minimums

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

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

Tenzing and Necklace

divide and conquer, dp, greedy

Strange Covering

divide and conquer

Dušan's Railway

divide and conquer, graphs, trees

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Balance the Cards

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

Tree LGM

constructive algorithms, divide and conquer, games, trees

Journey

data structures, divide and conquer, graphs, trees

Speckled Band

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

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Yet Yet Another Permutation Problem

divide and conquer, fft, math

Treasure Hunt

data structures, divide and conquer, two pointers

Koxia and Bracket

divide and conquer, fft, math

Iqea

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

Test Data Generation

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

Stairs

combinatorics, divide and conquer, dp, fft, math

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Hard Cut

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

Half-sum

brute force, divide and conquer, greedy

Gregor and the Two Painters

data structures, divide and conquer, graphs, greedy, 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

Raining season

data structures, divide and conquer, trees

Teleportation in Byteland

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

Air Reform

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

Try Booking

data structures, divide and conquer

Invertation in Tournament

brute force, divide and conquer, graphs, math

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

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Reindeer Games

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

Li Hua and Path

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

Finding lines

constructive algorithms, divide and conquer, interactive

Gasoline prices

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

Yet Another Partiton Problem

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

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

Quick Tortoise

bitmasks, divide and conquer, dp

Logistical Questions

dfs and similar, divide and conquer, trees

Freezing with Style

binary search, data structures, divide and conquer, trees

Keep XOR Low

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

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

Graph Coloring (hard version)

brute force, combinatorics, divide and conquer, dp, fft, graphs

Cycles in product

combinatorics, divide and conquer, trees

Timofey and our friends animals

data structures, divide and conquer, dsu

Fox And Polygon

constructive algorithms, divide and conquer

XOR and Distance

bitmasks, divide and conquer, trees

Pumping Stations

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

Subsequence

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

Fairy

dfs and similar, divide and conquer, dsu

Perfect Matching

data structures, divide and conquer, interactive, trees

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Random Elections

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

Inverse Genealogy

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

Nikita and game

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

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Sherlock's bet to Moriarty

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

Joker

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

Chess Strikes Back (hard version)

data structures, divide and conquer

Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Raging Thunder

data structures, divide and conquer, implementation

Parking Lot

data structures, divide and conquer

Battalion Strength

data structures, divide and conquer, probabilities

Jellyfish and Miku

divide and conquer, dp, math, probabilities

Interesting Sections

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

Decinc Dividing

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

Serious Business

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

Yura and Developers

data structures, divide and conquer

Minimal String Xoration

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

Sum

data structures, divide and conquer, dp, greedy

Kingdom and its Cities

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

The Final Pursuit

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

Omkar and Modes

binary search, divide and conquer, interactive

Double Tree

data structures, divide and conquer, shortest paths, trees

Communication Towers

brute force, divide and conquer, dsu

Maximums and Minimums

combinatorics, data structures, divide and conquer, number theory

Number Clicker

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

Jumping Around

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

XOR Partition

binary search, bitmasks, data structures, divide and conquer, greedy, trees

New Year Shopping

divide and conquer, dp

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers

Approximate Diameter

binary search, divide and conquer, graphs, shortest paths

X-OR

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