Max Mex

data structures, trees

Space Rescuers

geometry, ternary search

Strange Array

data structures, greedy, sortings

Путь Робота

constructive algorithms, dfs and similar, graphs

Economic Difficulties

data structures, dfs and similar, dp, flows, graphs, trees

Long Colorful Strip

dp

New Year and Handle Change

binary search, dp

Letter A

geometry, implementation

Kids' Riddle

*special problem

Christmas Chocolates

dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees

Dasha and Chess

constructive algorithms, games, interactive

Points and Segments

graphs

Instant Messanger

data structures

Furlo and Rublo and Game

games, implementation, math

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Zbazi in Zeydabad

data structures, implementation

Good Graph

data structures, dsu, graphs, trees

Opening Portals

dsu, graphs, shortest paths

Helping People

dp, probabilities

Groceries in Meteor Town

binary search, data structures, dsu, trees

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Serega the Pirate

brute force, constructive algorithms

Power Sockets

binary search, data structures, greedy

Lena and Queries

data structures, divide and conquer, geometry

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Balanced Domino Placements

combinatorics, dp

Parquet

combinatorics, constructive algorithms, greedy, implementation

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Code Review

*special problem

Indecisive Taxi Fee

data structures, graphs, shortest paths

Ladies' Shop

constructive algorithms, fft, math

Numbers

dp, math, number theory

Balancing Weapons

binary search, brute force, data structures, math, two pointers

April Fools' Problem (hard)

binary search, data structures, flows

Frog Jumping

*special problem, math

GCD Groups 2

greedy, number theory, probabilities

Generate superposition of all basis states

Colorful Constructive

constructive algorithms, data structures, greedy

Comfortably Numb

bitmasks, data structures, divide and conquer, strings, trees

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Buying Sets

flows, graph matchings

Monsters and Potions

brute force, dp, greedy, implementation

Apprentice Learning Trajectory

Airplane Arrangements

math, number theory

Balance

dp

Wise Men (Easy Version)

bitmasks, brute force, dp, meet-in-the-middle

Baby Ehab Plays with Permutations

combinatorics, dp, math

Guess Divisors Count

constructive algorithms, interactive, number theory

Slime and Biscuits

math, probabilities

Curfew

binary search, brute force, greedy, sortings

Lexichromatography

combinatorics, dfs and similar, dsu, graphs, two pointers

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Gotta Go Fast

binary search, dp

PolandBall and White-Red graph

constructive algorithms, graphs, shortest paths

Split

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

Divan and a Cottage

binary search, data structures

The Supersonic Rocket

geometry, hashing, strings

Contact ATC

Casinos and travel

dp

E-mail Addresses

implementation

Brand New Easy Problem

brute force

Clearing Up

constructive algorithms, dp, dsu, graphs

Closing ceremony

greedy

Playing on Graph

graphs, shortest paths

Tree Queries

data structures, dfs and similar, graphs, implementation, trees

The Tree

data structures

A Museum Robbery

data structures, dp

Table with Letters - 2

brute force, two pointers

Thwarting Demonstrations

binary search, data structures, trees

Fibonacci Sums

dp, math

Abnormal Permutation Pairs (hard version)

combinatorics, dp, fft, math

Boboniu and Jianghu

dp, greedy, sortings, trees

Singer House

combinatorics, dp, graphs, trees

Superset

constructive algorithms, divide and conquer

Off by One

constructive algorithms, dfs and similar, geometry, graphs, sortings, trees

Even Harder

dp

Danger of Mad Snakes

combinatorics, dp, math

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

Elevator

dp, graphs, shortest paths

Autocompletion

*special problem, strings, trees

Greedy Change

constructive algorithms

Red-White Fence

combinatorics, fft

String Journey

data structures, dp, string suffix structures

Nested Rubber Bands

constructive algorithms, dfs and similar, dp, math, trees

General Mobilization

data structures, dfs and similar, sortings

Hobbits

binary search, geometry

Nastya and Time Machine

constructive algorithms, dfs and similar, graphs, trees

Research Rover

combinatorics, dp

The Coronation

graphs, implementation

Tavas and Pashmaks

geometry, math

Village (Maximum)

*special problem, dfs and similar, trees

The Neutral Zone

brute force, math

Dark Assembly

brute force, probabilities

Nauuo and Pictures (hard version)

dp, probabilities

Petya and Pipes

flows, graphs, shortest paths

Zoning Restrictions

dp, flows, graphs

Preorder Test

binary search, dfs and similar, dp, graphs, greedy, trees

Bear and Floodlight

bitmasks, dp, geometry

Robo-Footballer

binary search, geometry

Traveling Graph

bitmasks, graph matchings, graphs