Pashmak and Flowers

combinatorics, implementation, sortings

Random Teams

combinatorics, constructive algorithms, greedy, math

Sum in Binary Tree

bitmasks, combinatorics, math, trees

Dreamoon and WiFi

bitmasks, brute force, combinatorics, dp, math, probabilities

K-th Beautiful String

binary search, brute force, combinatorics, implementation, math

Password

brute force, combinatorics, implementation, math

Dictionary

combinatorics, math

Yet Another Broken Keyboard

combinatorics, dp, implementation

Ski Resort

combinatorics, math, two pointers

Longest Divisors Interval

brute force, combinatorics, greedy, math, number theory

Infinite Replacement

combinatorics, implementation, strings

AND 0, Sum Big

bitmasks, combinatorics, math

Customising the Track

combinatorics, greedy, math

Hossam and Combinatorics

combinatorics, math, sortings

Pasha and Stick

combinatorics, math

Tavas and SaDDas

bitmasks, brute force, combinatorics, implementation

Binary Cafe

bitmasks, combinatorics, math

Domino on Windowsill

combinatorics, constructive algorithms, math

Mashmokh and ACM

combinatorics, dp, number theory

JOE is on TV!

combinatorics, greedy, math

Lucky Numbers

combinatorics, math

Ball in Berland

combinatorics, graphs, math

Contest Start

combinatorics, geometry, greedy, math

Erase First or Second Letter

brute force, combinatorics, data structures, dp, strings

Matching

combinatorics, math

Forming Triangles

combinatorics, constructive algorithms, math, sortings

Luntik and Subsequences

combinatorics, math

Marin and Anti-coprime Permutation

combinatorics, math, number theory

Two Round Dances

combinatorics, math

Counting Orders

combinatorics, math, sortings, two pointers

Chocolate

combinatorics

Apple Tree

combinatorics, dfs and similar, dp, math, trees

Combinatorics Homework

combinatorics, greedy, math

Points on Line

binary search, combinatorics, two pointers

Emordnilap

combinatorics, greedy, math

Ice Cream Balls

binary search, combinatorics, constructive algorithms, math

Divisible Pairs

combinatorics, math, number theory

A-characteristic

combinatorics, constructive algorithms, math

Permutation Partitions

combinatorics, greedy, math

Make it Alternating

combinatorics, dp, greedy

Running for Gold

combinatorics, graphs, greedy, sortings

Cyclic Permutations

combinatorics, dp, graphs, math

Bestie

brute force, combinatorics, constructive algorithms, implementation, math, number theory

Silent Classroom

combinatorics, greedy

AND Sequences

bitmasks, combinatorics, constructive algorithms, math

Kuroni and Impossible Calculation

brute force, combinatorics, math, number theory

CQXYM Count Permutations

combinatorics, math, number theory

Close Tuples (easy version)

binary search, combinatorics, math, sortings, two pointers

Far Relative’s Birthday Cake

brute force, combinatorics, constructive algorithms, implementation

Advertising Agency

combinatorics, math, sortings

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Two Arrays

combinatorics, dp

The Number of Products

combinatorics, dp, implementation

Reorder the Array

combinatorics, data structures, math, sortings, two pointers

Carrying Conundrum

bitmasks, combinatorics, dp, math

Weird Sum

combinatorics, data structures, geometry, math, matrices, sortings

Jury Meeting

combinatorics, math

Kolya and Tanya

combinatorics

Modulo Sum

combinatorics, data structures, dp, two pointers

Ciel and Flowers

combinatorics, math

Tiles

combinatorics, greedy, math

The Morning Star

combinatorics, data structures, geometry, implementation, math, sortings

Rubik's Cube Coloring (easy version)

combinatorics, math

Wet Shark and Bishops

combinatorics, implementation

The World is a Theatre

combinatorics, math

Alice and the List of Presents

combinatorics, math

New Year and Ascent Sequence

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

Binary Search

binary search, combinatorics

Substring Removal

combinatorics, math, strings

Pocket Book

combinatorics

Ayoub and Lost Array

combinatorics, dp, math

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

Zigzags

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

Minimum number of steps

combinatorics, greedy, implementation, math

Playoff

combinatorics, constructive algorithms, dp, greedy, math

The Third Problem

combinatorics, constructive algorithms, math

Bus Video System

combinatorics, math

Close Tuples (hard version)

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

Ayoub's function

binary search, combinatorics, greedy, math, strings

Count the Arrays

combinatorics, math

Beautiful Numbers

brute force, combinatorics

Binary Strings are Fun

combinatorics, math

Good Triples

brute force, combinatorics, number theory

Card Game

combinatorics, constructive algorithms, dp, games

Classy Numbers

combinatorics, dp

Count The Blocks

combinatorics, dp, math

Triangle Coloring

combinatorics, math

Kavi on Pairing Duty

combinatorics, dp, math

Training Session

combinatorics, data structures, geometry, implementation, math

Kyoya and Colored Balls

combinatorics, dp, math

Monoblock

combinatorics, data structures, implementation, math

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Serval and Toxel's Arrays

combinatorics, dp, implementation, math

Bargain

combinatorics, dp, math

Radio Towers

combinatorics, dp, math

Submarine in the Rybinsk Sea (easy edition)

combinatorics, math, number theory

How Does the Rook Move?

combinatorics, dp, math

New Year and Permutation

combinatorics, math

Almost Identity Permutations

combinatorics, dp, math

The Fair Nut and String

combinatorics, dp, implementation