The Delivery Dilemma

binary search, greedy, sortings

Black, White and Grey Tree

binary search, constructive algorithms, dfs and similar, dp, greedy, trees

Greedy Shopping

binary search, data structures, divide and conquer, greedy, implementation

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Make It Increasing

binary search, constructive algorithms, data structures, dp, implementation

Complicated Computations

binary search, data structures, two pointers

Bandit in a City

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

Binary Search

binary search, combinatorics

Neural Network Problem

*special problem, binary search, greedy

String Deletion

binary search, data structures, greedy, two pointers

Rotary Laser Lock

binary search, interactive

Fruit Sequences

binary search, data structures, divide and conquer, dp, two pointers

Carrots for Rabbits

binary search, data structures, greedy, math, sortings

Prison Break

binary search, games, geometry, ternary search

Increase and Copy

binary search, constructive algorithms, math

Lonely Numbers

binary search, math, number theory, two pointers

Valuable Paper

binary search, flows, graph matchings, graphs

Rain of Fire

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

Sage's Birthday (hard version)

binary search, brute force, constructive algorithms, greedy, sortings, two pointers

Sage's Birthday (easy version)

binary search, constructive algorithms, greedy, sortings

Expected Damage

binary search, combinatorics, probabilities

Split

binary search, data structures, dp, greedy

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Perform Easily

binary search, brute force, dp, implementation, sortings, two pointers

Two Platforms

binary search, dp, sortings, two pointers

Rainbow Triples

binary search, data structures, flows, greedy

Searchlights

binary search, brute force, data structures, dp, implementation, sortings, two pointers

Discrete Acceleration

binary search, dp, implementation, math, two pointers

Fixed Point Removal

binary search, constructive algorithms, data structures, greedy, two pointers

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Reverse and Swap

binary search, bitmasks, data structures

Weights Division (hard version)

binary search, dfs and similar, greedy, sortings, trees, two pointers

Controversial Rounds

binary search, data structures, dp, greedy, two pointers

Two Types of Spells

binary search, data structures, greedy, implementation, math, sortings

Boboniu and String

binary search, geometry, ternary search

Omkar and Landslide

binary search, constructive algorithms, data structures, greedy, math

Graph

*special problem, binary search, dfs and similar, dp, math, ternary search

Colors

*special problem, binary search, constructive algorithms, interactive

Chess Strikes Back (easy version)

binary search, data structures

New Passenger Trams

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

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Dubious Cyrpto

binary search, brute force, math, number theory

Network Coverage

binary search, constructive algorithms, data structures, greedy

Omkar and Modes

binary search, divide and conquer, interactive

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

Asterism (Easy Version)

binary search, brute force, combinatorics, math, number theory, sortings

The Hidden Pair (Hard Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

The Hidden Pair (Easy Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Flying Sort (Hard Version)

binary search, data structures, dp, greedy, sortings, two pointers

Jog Around The Graph

binary search, dp, geometry, graphs

Two Arrays

binary search, brute force, combinatorics, constructive algorithms, dp, two pointers

Shovels and Swords

binary search, greedy, math

Guess The Maximums

binary search, implementation, interactive, math

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

Binary Median

binary search, bitmasks, brute force, constructive algorithms

RC Kaboom Show

binary search, brute force, data structures, geometry, math

Mixing Water

binary search, math

Tasty Cookie

binary search, constructive algorithms, greedy, implementation

The Best Vacation

binary search, brute force, greedy, implementation, two pointers

Restorer Distance

binary search, greedy, math, sortings, ternary search

Count Triangles

binary search, implementation, math, two pointers

Find a Gift

binary search, interactive, probabilities

Multiset

binary search, data structures

Not So Simple Polygon Embedding

binary search, brute force, geometry, math

Simple Polygon Embedding

binary search, geometry, math, ternary search

Ternary String

binary search, dp, implementation, two pointers

K-th Not Divisible by n

binary search, math

Phoenix and Science

binary search, constructive algorithms, greedy, implementation, math

Card Constructions

binary search, brute force, dp, math

Résumé Review

binary search, greedy, math

Multiple Testcases

binary search, constructive algorithms, data structures, greedy, sortings, two pointers

Xenia and Colorful Gems

binary search, greedy, math, sortings, two pointers

Three Blocks Palindrome (easy version)

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

Two Teams Composing

binary search, greedy, implementation, sortings

Strange Function

binary search, data structures, dp, greedy

Eugene and an array

binary search, data structures, implementation, two pointers

Dreamoon Loves AA

binary search, greedy

K-th Beautiful String

binary search, brute force, combinatorics, implementation, math

Prefix-Suffix Palindrome (Hard version)

binary search, greedy, hashing, string suffix structures, strings

Pair of Topics

binary search, data structures, sortings, two pointers

Frog Jumps

binary search, data structures, dfs and similar, greedy, implementation

Count Subrectangles

binary search, greedy, implementation

Present

binary search, bitmasks, constructive algorithms, data structures, math, sortings

Homecoming

binary search, dp, greedy, strings

Au Pont Rouge

binary search, dp, strings

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Cow and Fields

binary search, data structures, dfs and similar, graphs, greedy, shortest paths, sortings

Kuroni the Private Tutor

binary search, greedy

Nanosoft

binary search, data structures, dp, implementation

Ayoub's function

binary search, combinatorics, greedy, math, strings

Motarack's Birthday

binary search, greedy, ternary search

Bonus Distribution

*special problem, binary search, greedy, sortings

ConneR and the A.R.C. Markland-N

binary search, brute force, implementation

Irreducible Anagrams

binary search, constructive algorithms, data structures, strings, two pointers

Minimax Problem

binary search, bitmasks, dp

Deadline

binary search, brute force, math, ternary search

Classical?

binary search, combinatorics, number theory

New Year and Conference

binary search, data structures, hashing, sortings