Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Chess Rush

*special problem, combinatorics, dp, implementation, math

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Zigzags

brute force, combinatorics, data structures, math, two pointers

ZS Shuffles Cards

combinatorics, dp, math, probabilities

Cyclic Permutations

combinatorics, dp, graphs, math

Strange Operation

combinatorics, data structures, dp

Asterism (Hard Version)

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

Asterism (Easy Version)

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

Two Arrays

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

Secure Password

bitmasks, combinatorics, constructive algorithms, interactive, math

Modular Stability

combinatorics, math, number theory

Placing Rooks

combinatorics, fft, math

Chiori and Doll Picking (hard version)

bitmasks, brute force, combinatorics, math

Chiori and Doll Picking (easy version)

bitmasks, brute force, combinatorics, math

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Height All the Same

combinatorics, constructive algorithms, math, matrices

Dreamoon Likes Sequences

bitmasks, combinatorics, math

K-th Beautiful String

binary search, brute force, combinatorics, implementation, math

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Count The Blocks

combinatorics, dp, math

Permutation Partitions

combinatorics, greedy, math

Count the Arrays

combinatorics, math

Cow and Treats

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

Kuroni and Impossible Calculation

brute force, combinatorics, math, number theory

Ayoub's function

binary search, combinatorics, greedy, math, strings

Around the World

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

Good Contest

combinatorics, dp, probabilities

JOE is on TV!

combinatorics, greedy, math

Nora's Toy Boxes

bitmasks, combinatorics, dp

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Two Arrays

combinatorics, dp

Classical?

binary search, combinatorics, number theory

New Year and Castle Construction

combinatorics, geometry, math, sortings

New Year and Permutation

combinatorics, math

New Year and Ascent Sequence

binary search, combinatorics, data structures, dp, implementation, sortings

Intergalactic Sliding Puzzle

combinatorics, constructive algorithms, math

New Year Permutations

combinatorics, dp

Santa's Bot

combinatorics, math, probabilities

Cards

combinatorics, dp, math, number theory, probabilities

Beautiful Rectangle

brute force, combinatorics, constructive algorithms, data structures, greedy, math

Two Fairs

combinatorics, dfs and similar, dsu, graphs

Yet Another Broken Keyboard

combinatorics, dp, implementation

Common Number

binary search, combinatorics, dp, math

Key Storage

combinatorics, math

Beautiful Bracket Sequence (hard version)

combinatorics, probabilities

Beautiful Bracket Sequence (easy version)

combinatorics, dp, probabilities

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Red-White Fence

combinatorics, fft

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Ivan the Fool and the Probability Theory

combinatorics, dp, math

AB-string

binary search, combinatorics, dp, strings

Balanced Domino Placements

combinatorics, dp

Alice and the List of Presents

combinatorics, math

Another Filling the Grid

combinatorics, dp, math

Wrong Answer on test 233 (Hard Version)

combinatorics, math

Graph And Numbers

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

The Number of Products

combinatorics, dp, implementation

Number Of Permutations

combinatorics

Expected Value Again

combinatorics, strings

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Print a 1337-string...

combinatorics, constructive algorithms, math, strings

Culture Code

binary search, combinatorics, data structures, dp, shortest paths, sortings

Submarine in the Rybinsk Sea (hard edition)

combinatorics, math, number theory

Submarine in the Rybinsk Sea (easy edition)

combinatorics, math, number theory

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Problem from Red Panda

combinatorics

Playlist for Polycarp (hard version)

combinatorics, dp

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Flag

brute force, combinatorics, dp, implementation

Short Colorful Strip

combinatorics, dfs and similar, dp

Tiles

combinatorics, greedy, math

Ehab and the Expected GCD Problem

combinatorics, dp, math, number theory

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Scalar Queries

combinatorics, data structures, math, sortings

Range Deleting

binary search, combinatorics, data structures, two pointers

Silent Classroom

combinatorics, greedy

Serval and Bonus Problem

combinatorics, dp, math, probabilities

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Number of Components

combinatorics, data structures, dp, math

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Tree Cutting (Hard Version)

combinatorics, dfs and similar, dp, trees

Destroy the Colony

combinatorics, dp, math

Sasha and Interesting Fact from Graph Theory

brute force, combinatorics, dp, math, trees

Ayoub and Lost Array

combinatorics, dp, math

Monotonic Renumeration

combinatorics, sortings

Vladislav and a Great Legend

combinatorics, dp, trees

Alex and a TV Show

bitmasks, combinatorics, number theory

The Top Scorer

combinatorics, dp, math, probabilities

Substring Removal

combinatorics, math, strings

New Year and the Permutation Concatenation

combinatorics, dp, math

Interval-Free Permutations

combinatorics

Beautiful Matrix

combinatorics, data structures, dp

The Fair Nut and String

combinatorics, dp, implementation

Colorful Bricks

combinatorics, dp, math

Segment Sum

bitmasks, combinatorics, dp, math

Side Transmutations

combinatorics, strings

Shrinking Tree

combinatorics, dp

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths