Substring Search

bitmasks, brute force, fft

Strange Function

binary search, data structures, dp, greedy

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Minimum Euler Cycle

constructive algorithms, graphs, greedy, implementation

Circle of Monsters

brute force, constructive algorithms, greedy, math

Kate and imperfection

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

Road to 1600

brute force, constructive algorithms

Challenges in school №41

brute force, constructive algorithms, games, graphs, greedy, implementation, sortings

Eugene and an array

binary search, data structures, implementation, two pointers

No Monotone Triples

data structures

Independent Set

dfs and similar, dp, trees

Height All the Same

combinatorics, constructive algorithms, math, matrices

Walk on Matrix

bitmasks, constructive algorithms, math

Dreamoon Loves AA

binary search, greedy

Dreamoon Likes Strings

constructive algorithms, data structures

Drazil Likes Heap

constructive algorithms, data structures, greedy, implementation

Dreamoon Likes Sequences

bitmasks, combinatorics, math

Dreamoon Likes Coloring

constructive algorithms, greedy, implementation, math

Make k Equal

greedy

Tree Queries

dfs and similar, graphs, trees

Carousel

constructive algorithms, dp, graphs, greedy, math

Letters and Question Marks

bitmasks, dp, string suffix structures

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Count The Blocks

combinatorics, dp, math

Infinite Path

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

Game with Chips

constructive algorithms, implementation

Spiderweb Trees

dp, geometry, trees

Wise Men (Hard Version)

bitmasks, dp, math

Wise Men (Easy Version)

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

Bombs

data structures, two pointers

Prefix-Suffix Palindrome (Hard version)

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

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Ehab's REAL Number Theory Problem

brute force, dfs and similar, graphs, number theory, shortest paths

Ehab the Xorcist

bitmasks, constructive algorithms, greedy, number theory

Maximum White Subtree

dfs and similar, dp, graphs, trees

Sleeping Schedule

dp, implementation

Assigning Fares

dp, trees

Median Mountain Range

data structures

Reality Show

bitmasks, dp

Instant Noodles

graphs, hashing, math, number theory

Present

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

Remove Adjacent

brute force, constructive algorithms, greedy, strings

Blocks and Sensors

brute force

Treeland and Viruses

data structures, dfs and similar, dp, shortest paths, trees

Reachable Strings

data structures, hashing, strings

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Navigation System

dfs and similar, graphs, shortest paths

Battalion Strength

data structures, divide and conquer, probabilities

Team Building

bitmasks, dp, greedy, sortings

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Primitive Primes

constructive algorithms, math, ternary search

Concatenation with intersection

data structures, hashing, strings, two pointers

Happy New Year

bitmasks, dp, implementation

Skyscrapers (hard version)

data structures, dp, greedy

Different Rules

constructive algorithms, greedy, implementation, math

Autocompletion

data structures, dfs and similar, dp

Attack on Red Kingdom

games, two pointers

Array Shrinking

dp, greedy

Count the Arrays

combinatorics, math

Moving Points

data structures, divide and conquer, implementation, sortings

Construct the Binary Tree

brute force, constructive algorithms, trees

Three Integers

brute force, math

Bad Cryptography

math, number theory

Strange Function

dp

Tourism

dp, graphs, probabilities

Au Pont Rouge

binary search, dp, strings

Double Elimination

dp, implementation

Recommendations

data structures, greedy, sortings

Cow and Exercise

flows, graphs, shortest paths

Cow and Vacation

dfs and similar, dsu, trees

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

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Kuroni and the Punishment

math, number theory, probabilities

Kuroni and the Score Distribution

constructive algorithms, greedy, implementation, math

Kuroni and the Celebration

constructive algorithms, dfs and similar, interactive, trees

Kuroni and Impossible Calculation

brute force, combinatorics, math, number theory

Animal Observation (hard version)

data structures, dp, greedy

Animal Observation (easy version)

data structures, dp

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Shortest and Longest LIS

constructive algorithms, graphs, greedy, two pointers

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Number of Components

dsu, implementation

Erase Subsequences

dp, strings

Fill The Bag

bitmasks, greedy

Perfect Keyboard

dfs and similar, greedy, implementation

Super Jaber

dfs and similar, graphs, implementation, shortest paths

Nanosoft

binary search, data structures, dp, implementation

Time to Run

constructive algorithms, graphs, implementation

Ayoub's function

binary search, combinatorics, greedy, math, strings

So Mean

interactive, math

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

Water Balance

data structures, geometry, greedy

Aerodynamic

geometry

Berland Beauty

constructive algorithms, dfs and similar, greedy, sortings, trees

String Coloring (hard version)

data structures, dp

String Coloring (easy version)

constructive algorithms, dp, graphs, greedy, sortings

Good Contest

combinatorics, dp, probabilities

Permutation Separation

data structures, divide and conquer