Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Andrey's Tree

binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees

Design Tutorial: Increase the Constraints

bitmasks, data structures, fft

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Location

data structures, dp, math, number theory

Sherlock's bet to Moriarty

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

Robots protection

data structures

Joker

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

Chess Strikes Back (hard version)

data structures, divide and conquer

Big Problems for Organizers

data structures, graphs, trees

Distance to the Path

data structures, dfs and similar, trees

Last Man Standing

brute force, data structures, number theory

Cyclic Cipher

chinese remainder theorem, data structures, implementation, number theory, two pointers

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Ehab and a weird weight formula

data structures, trees

BRT Contract

data structures

Raging Thunder

data structures, divide and conquer, implementation

The Next Good String

data structures, greedy, hashing, strings

Battalion Strength

data structures, divide and conquer, probabilities

Parking Lot

data structures, divide and conquer

M-tree

data structures, math, sortings, trees

Cats on the Upgrade (hard version)

binary search, data structures, dfs and similar, graphs, trees

Misha and Apples

brute force, data structures, dp, two pointers

Karen and Cards

binary search, combinatorics, data structures, geometry

Ultimate Weirdness of an Array

data structures, number theory

Tricky and Clever Password

binary search, constructive algorithms, data structures, greedy, hashing, strings

Two Centroids

data structures, dfs and similar, greedy, trees

Prince's Problem

brute force, data structures, math, number theory, trees

Roads and Ramen

data structures, trees

Xors on Segments

data structures, strings, trees

Eels

data structures

Yash And Trees

bitmasks, data structures, dfs and similar, math, number theory

Cow Tennis Tournament

combinatorics, data structures, math

Interesting Sections

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

Leha and security system

data structures

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Strange Operation

combinatorics, data structures, dp

Decinc Dividing

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

Serious Business

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

A Museum Robbery

data structures, dp

Yura and Developers

data structures, divide and conquer

NN country

binary search, data structures, trees

Closest Pair

data structures, greedy

Minimal String Xoration

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

Team Rocket Rises Again

data structures, graphs, shortest paths

Little Elephant and Strings

data structures, implementation, string suffix structures, two pointers

T-Shirts

data structures

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Kazaee

data structures, hashing, probabilities

e-Government

data structures, dfs and similar, dp, strings, trees

You Are Given a Tree

data structures, dp, trees

Sum

data structures, divide and conquer, dp, greedy

Mike and Friends

data structures, string suffix structures, strings, trees

Points

data structures

Game with Segments

*special problem, data structures, games

MUH and Lots and Lots of Segments

data structures, dsu

Desert

data structures, graphs

Game with Two Trees

data structures

Cubes

data structures, dp, geometry, two pointers

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

Store

data structures

Maximum Sine

binary search, data structures, number theory

Donkey and Stars

data structures, dp, geometry, math, sortings

Uncle Bogdan and Projections

data structures, geometry, sortings

Adilbek and the Watering System

data structures, greedy, sortings

Most Dangerous Shark

data structures, dp, two pointers

Almost Sorted

bitmasks, data structures, dp

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Arkady and a Nobody-men

data structures, dfs and similar, trees

Double Tree

data structures, divide and conquer, shortest paths, trees

Game On Tree

data structures, dfs and similar, greedy, trees

Colored Tree

data structures, trees

Train Car Selection

data structures, greedy

Sasha and a Very Easy Test

data structures, number theory

DFS

data structures

Yet Another Maxflow Problem

data structures, flows, graphs

Concatenation with intersection

data structures, hashing, strings, two pointers

Birthday

data structures, dfs and similar, dp, trees

And Yet Another Bracket Sequence

data structures, greedy, hashing, string suffix structures, strings

Farmer John's Favorite Function

brute force, data structures, implementation, math

Construct the String

data structures, dp, strings

Strange Instructions

data structures, greedy, implementation

Two-Paths

data structures, dp, trees

Chess Strikes Back (easy version)

binary search, data structures

Paths

data structures, number theory

Maximums and Minimums

combinatorics, data structures, divide and conquer, 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

Magician and Pigs (Hard Version)

binary search, brute force, data structures, implementation

Andryusha and Nervous Barriers

data structures, dp

Gardener Alex

binary search, data structures

Chips on a Board

bitmasks, brute force, data structures, dp, games, two pointers

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Misha and Paintings

constructive algorithms, data structures, greedy, implementation, math

Fedor Runs for President

data structures, dp, trees

Friends

binary search, bitmasks, data structures, math

Fibonotci

data structures, math, matrices

Two Permutations

data structures, hashing, strings

Split

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

Good Graph

data structures, dsu, graphs, trees