Almost Sorted

binary search, combinatorics, constructive algorithms

Travelling Salesman Problem

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

Subset Trick

binary search, data structures

Two chandeliers

binary search, brute force, chinese remainder theorem, math, number theory

Box Fitting

binary search, bitmasks, data structures, greedy

1D Sokoban

binary search, dp, greedy, implementation, two pointers

K-beautiful Strings

binary search, brute force, constructive algorithms, greedy, strings

Maximum width

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

Magnets

binary search, constructive algorithms, interactive

Old Floppy Drive

binary search, data structures, math

Equalize the Array

binary search, data structures, greedy, math, sortings

Accidental Victory

binary search, data structures, greedy

Sum of Cubes

binary search, brute force, brute force, math

Dogecoin

*special problem, *special problem, binary search, data structures

Problemsolving Marathon

*special problem, binary search, greedy

Two Policemen

*special problem, binary search, brute force, math

Pythagorean Triples

binary search, brute force, math, number theory

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Max Median

binary search, data structures, dp

Guessing the Greatest (hard version)

binary search, interactive

Guessing the Greatest (easy version)

binary search, interactive

Eastern Exhibition

binary search, geometry, shortest paths, sortings

Floor and Mod

binary search, brute force, math, number theory

Vabank

binary search, interactive

Odd Mineral Resource

binary search, bitmasks, brute force, data structures, probabilities, trees

Searching Local Minimum

binary search, interactive, ternary search

Lanterns

binary search, data structures, dp

Inflation

binary search, brute force, greedy, math

K-divisible Sum

binary search, constructive algorithms, greedy, math

Cleaning the Phone

binary search, dp, sortings, two pointers

Different Divisors

binary search, constructive algorithms, greedy, math, number theory

Correct Placement

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

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Strange Shuffle

binary search, brute force, constructive algorithms, interactive

Strange Birthday Party

binary search, dp, greedy, sortings, two pointers

Power Sockets

binary search, data structures, greedy

Prime Divisors Selection

binary search, greedy, math, number theory

Hobbits

binary search, geometry

Firecrackers

binary search, sortings

The Riddle of the Sphinx

binary search, data structures, data structures, interactive

Pairs

binary search, constructive algorithms, greedy, two pointers

Dungeon

binary search, math

The Treasure of The Segments

binary search, data structures, greedy

Close Tuples (hard version)

binary search, combinatorics, implementation, math, sortings, two pointers

Close Tuples (easy version)

binary search, combinatorics, math, sortings, two pointers

Divide and Summarize

binary search, brute force, data structures, divide and conquer, implementation, sortings

Array Partition

binary search, data structures, greedy, two pointers

Dog Snacks

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

Toy Blocks

binary search, greedy, math, sortings

Rating Compression

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

Line Distance

binary search, data structures, geometry

Xor Tree

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

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