Minimax

constructive algorithms, greedy, strings

Extra-terrestrial Intelligence

implementation

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Pasha and Phone

binary search, math

Marathon

implementation, math

Lucky Queries

data structures

Help Chef Gerasim

implementation, sortings

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Gluttony

constructive algorithms, greedy

Read Time

binary search, greedy, two pointers

Paths in a Complete Binary Tree

bitmasks, trees

Clothes

brute force

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math

Subsequences (hard version)

dp, strings

Secret

constructive algorithms, implementation

Vlad and the Mountains

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

Kuroni and the Score Distribution

constructive algorithms, greedy, implementation, math

Little Artem and Time Machine

data structures

Marbles

bitmasks, dp

New Year and Conference

binary search, data structures, hashing, sortings

Credit Card

data structures, dp, greedy, implementation

String Manipulation 1.0

*special problem, binary search, brute force, data structures, strings

Delete Them

constructive algorithms, implementation

Calendar

brute force, implementation

Nearest Fraction

brute force, implementation, two pointers

Balls and Boxes

constructive algorithms, greedy, implementation

Send Boxes to Alice (Hard Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Skyline Photo

data structures, divide and conquer, dp

System Administrator

graphs

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

Prime Number

math, number theory

Closest Equals

*special problem, data structures

Mysterious strings

*special problem, implementation

Turn Off The TV

data structures, sortings

Blood Cousins Return

binary search, data structures, dfs and similar, dp, sortings

Winter Is Coming

dp, greedy, sortings

Ciel and Duel

dp, flows, greedy

My pretty girl Noora

brute force, dp, greedy, math, number theory

Single-use Stones

binary search, flows, greedy, two pointers

Permutation Game

implementation

Pavel and barbecue

constructive algorithms, dfs and similar

Monsters

brute force, data structures, dfs and similar, dsu, graphs, greedy

Expand the Path

brute force, combinatorics, data structures, implementation, math

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

Clear Symmetry

constructive algorithms, dp, math

Let's Play the Words?

data structures, hashing, implementation, math

Array Shuffling

constructive algorithms, graphs, greedy

Rectangle Painting 1

dp

Bank Hacking

constructive algorithms, data structures, dp, trees

Salyg1n and Array (hard version)

constructive algorithms, interactive

Make k Equal

greedy

Robin Hood

binary search, greedy

Vasya and Good Sequences

bitmasks, dp

Vasya and Beautiful Arrays

brute force, dp, number theory

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Sergey and Subway

dfs and similar, dp, trees

Centroids

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

Labyrinth

dfs and similar, graphs

Tennis Game

binary search

Flying Sort (Easy Version)

dp, greedy, two pointers

Coprime Subsequences

bitmasks, combinatorics, number theory

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Minimal Labels

data structures, dfs and similar, graphs, greedy

Elections

greedy

Exposition

binary search, data structures, dsu, trees, two pointers

Message

brute force

Five Dimensional Points

brute force, geometry, math

Merge Sort

constructive algorithms, divide and conquer

Flag

brute force, combinatorics, dp, implementation

Maximize!

binary search, greedy, ternary search, two pointers

Game on Sum (Easy Version)

combinatorics, dp, games, math

Least Cost Bracket Sequence

greedy

Command Line Arguments

*special problem, implementation, strings

April Fools' Problem (easy)

greedy, sortings

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

The Human Equation

greedy, implementation

Almost Triple Deletions

data structures, dp, greedy

Infinite Path

brute force, dfs and similar, graphs, math, number theory

Naming Company

games, greedy, sortings

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Sleepy Game

dfs and similar, dp, games, graphs

MEX vs DIFF

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

Number of Components

combinatorics, data structures, dp, math

Space Formula

greedy

The Big Race

math

Yaroslav and Sequence

constructive algorithms

Om Nom and Spiders

implementation, math

Petya and His Friends

constructive algorithms, math, number theory

Mahmoud and Ehab and another array construction task

constructive algorithms, greedy, math, number theory

Equalizing Two Strings

constructive algorithms, sortings, strings

Decreasing Heights

brute force, dp

New Year and Fireworks

brute force, data structures, dfs and similar, dp, implementation

Friends and Subsequences

binary search, data structures

Build a Tree and That Is It

constructive algorithms, implementation, trees

Nezzar and Binary String

data structures, greedy

Graph Coloring

dfs and similar, dp, graphs

Magazine Ad

binary search, greedy

Resort

graphs

Four Segments

brute force, constructive algorithms, geometry, implementation, math