Social Network

greedy, two pointers

Omkar and Last Floor

dp, greedy, two pointers

Flip the Cards

2-sat, constructive algorithms, data structures, greedy, sortings, two pointers

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Array Equalizer

binary search, greedy, implementation, math, number theory, sortings, two pointers

Polycarp and the Language of Gods

*special problem, implementation, two pointers

Two Arrays

bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers

New Passenger Trams

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

Controversial Rounds

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

Permutation and Queries

brute force, data structures, divide and conquer, two pointers

Three Days Grace

data structures, dp, greedy, math, number theory, two pointers

Little Elephant and Strings

data structures, implementation, string suffix structures, two pointers

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

Decomposition

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

Name That Tune

dp, probabilities, two pointers

Emotional Fishermen

combinatorics, dp, math, two pointers

LCM Sum (hard version)

brute force, data structures, math, number theory, two pointers

Bamboo Partition

brute force, data structures, implementation, math, number theory, sortings, two pointers

Bug in Code

data structures, graphs, implementation, two pointers

Banquet Preparations 2

greedy, sortings, two pointers

Li Hua and Array

brute force, data structures, dsu, math, number theory, two pointers

Lightsabers (medium)

binary search, two pointers

Subway Innovation

greedy, math, two pointers

Songwriter

greedy, two pointers

Frequency Problem (Hard Version)

data structures, greedy, two pointers

Long Permutation

brute force, math, two pointers

Drazil and Morning Exercise

dfs and similar, dp, dsu, trees, two pointers

Good Subarrays (Hard Version)

binary search, data structures, dp, two pointers

Rectangle Shrinking

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

Dima and Trap Graph

binary search, data structures, dfs and similar, dsu, shortest paths, two pointers

Gaining Rating

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

Geometry Horse

greedy, implementation, sortings, two pointers

Yurii Can Do Everything

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

Double Knapsack

constructive algorithms, two pointers

Spider's Web

binary search, sortings, two pointers

Little Elephant and Inversions

data structures, two pointers

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Flying Sort (Hard Version)

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

Vika and Segments

constructive algorithms, data structures, geometry, two pointers

Balance Addicts

combinatorics, dp, math, two pointers

Infinite Card Game

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

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Two Editorials

brute force, dp, greedy, sortings, two pointers

Prime Gift

binary search, dfs and similar, math, meet-in-the-middle, number theory, two pointers

Max to the Right of Min

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

There Should Be a Lot of Maximums

brute force, data structures, dfs and similar, dp, trees, two pointers

Circular Mirror

binary search, combinatorics, geometry, math, two pointers

Bored Bakry

bitmasks, greedy, math, two pointers

Square-free division (hard version)

data structures, dp, greedy, math, number theory, two pointers

PermutationForces II

brute force, combinatorics, greedy, sortings, trees, two pointers

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Diana and Liana

greedy, implementation, two pointers

Vlad and the Nice Paths (hard version)

binary search, combinatorics, data structures, dp, math, two pointers

Professor GukiZ and Two Arrays

binary search, two pointers

Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

Earth Wind and Fire

constructive algorithms, greedy, math, sortings, two pointers

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Genetic Engineering

implementation, two pointers

Korney Korneevich and XOR (hard version)

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

Cubes

binary search, dp, two pointers

Beaver

data structures, dp, greedy, hashing, strings, two pointers

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

Xor of 3

brute force, constructive algorithms, greedy, two pointers

Two Bracket Sequences

dp, strings, two pointers

Excellent Arrays

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

Rooter's Song

constructive algorithms, data structures, geometry, implementation, sortings, two pointers

A Bit Similar

bitmasks, brute force, hashing, string suffix structures, strings, two pointers

Card Game Again

binary search, data structures, number theory, two pointers

Castle Defense

binary search, data structures, greedy, two pointers

Array Game

games, greedy, two pointers

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Bombs

data structures, two pointers

Irrigation

binary search, data structures, implementation, sortings, trees, two pointers

LCM Sum (easy version)

binary search, brute force, combinatorics, math, number theory, two pointers

Sofia and Strings

data structures, greedy, sortings, strings, two pointers

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Towers

dp, greedy, two pointers

Complicated Computations

binary search, data structures, two pointers

Olympiad

binary search, greedy, sortings, two pointers

Fruit Sequences

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

Petya, Petya, Petr, and Palindromes

binary search, brute force, data structures, two pointers

Skills

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

Correcting Mistakes

constructive algorithms, dp, greedy, hashing, strings, two pointers

Cartons of milk

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

Random Query

data structures, math, probabilities, two pointers

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Hamsters and Tigers

two pointers

Weights Division (hard version)

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

Non-Secret Cypher

two pointers

Not Escaping

data structures, dp, implementation, shortest paths, two pointers

Two strings

binary search, hashing, strings, two pointers

Sheikh (Hard Version)

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

Pinball

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

Fixed Point Removal

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

Jury Meeting

greedy, sortings, two pointers