Distinguish Z from S

*special problem

Distinguish I ⊗ X from CNOT

*special problem

Goofy Numbers

*special problem, implementation

Used Markers

*special problem, greedy

Set subtraction

*special problem

String Searching

*special problem, hashing

LCM

*special problem, implementation, math

Joker

*special problem, bitmasks, data structures, divide and conquer, dsu

Touchy-Feely Palindromes

*special problem, implementation

Storage2

*special problem

Magic Tree

*special problem, data structures, dp, trees

Decoding of Integer Sequences

*special problem, data structures, implementation

Cartoons

*special problem, implementation, sortings

Two Policemen

*special problem, binary search, brute force, math

Deutsch-Jozsa algorithm

*special problem

Dream Team

*special problem, greedy

Good Array

*special problem

AND oracle

*special problem

Exponentiation

*special problem

Magic Tricks

*special problem, dp, graphs

Игра в Девятку I

*special problem, brute force, dp

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

Rhyme

*special problem, implementation

Caesar Cipher

*special problem

Сортировка слиянием

*special problem

Stepan's Series

*special problem, dp

Редактируем Зингер | color

*special problem, *special problem

Rotation

*special problem, geometry, math

Сортировка слиянием

*special problem, *special problem, brute force

Table

*special problem, greedy, implementation, math

In Every Generation...

*special problem, strings

Distinguish Z from -Z

*special problem

Array Sorting

*special problem, implementation

Date calculation

*special problem

Cubeword

*special problem, brute force, dp, meet-in-the-middle

Bars

*special problem, binary search

Fix the String

*special problem, bitmasks, dp, greedy

Chocolate Bar

*special problem, math

Sweepstake

*special problem, brute force, constructive algorithms, implementation, math

Problemsolving Marathon

*special problem, binary search, greedy

The Teacher of Physical Education

*special problem

Symmetric Difference

*special problem

Binary notation

*special problem

OR oracle

*special problem

Sum and product

*special problem

Prepare state |01⟩ + |10⟩ + |11⟩

*special problem

World of Mouth

*special problem, strings

Remove and Add

*special problem, greedy

Amusement Park

*special problem, ternary search

Encoded message

*special problem, implementation

Tribonacci numbers

*special problem

Binary Notation

*special problem, implementation

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Presents

*special problem, greedy

Decrement

*special problem

Increment

*special problem

CAPS LOCK ON

*special problem

More Gifts

*special problem, dfs and similar, two pointers

Prime factorization

*special problem

Chess Team Forming

*special problem, binary search, data structures, greedy

Сортировка слиянием

*special problem, binary search

BHTML+BCSS

*special problem, dfs and similar, expression parsing

A polyline

*special problem, implementation

Lamps in a Line

*special problem, math

Reverse It!

*special problem, implementation

Bonus Distribution

*special problem, binary search, greedy, sortings

Контрольная сумма

*special problem

Sliding Doors

*special problem, binary search

Repairing Of String

*special problem, constructive algorithms

Hexakosioihexekontahexaphobia

*special problem

Mountain Climber

*special problem

Anti-diagonal unitary

*special problem

Colors

*special problem, binary search, constructive algorithms, interactive

Stack

*special problem, expression parsing, implementation

Amusement Park

*special problem, dp, math

Prime Segment

*special problem, brute force, math, number theory

Eval

*special problem

Primes in Interval

*special problem

Chessboard unitary

*special problem

Palindrome checker oracle

*special problem

Teams

*special problem, binary search, greedy, math

Remove digits

*special problem

Seasons

*special problem

Dune II: Battle For Arrakis

*special problem, data structures, greedy, math

Chess Match

*special problem

Significant Cups

*special problem, binary search, data structures, two pointers

Prefixes and Suffixes

*special problem, strings

Alternating case

*special problem

Evidence Board

*special problem, constructive algorithms, dfs and similar, graphs, trees

Binary String Partition

*special problem, binary search, greedy

Big Number and Remainder

*special problem, math, number theory

Six Characters

*special problem, constructive algorithms, strings

Modernization of Treeland

*special problem, dfs and similar, trees

Star Trek

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

Block unitary

*special problem

HQ

*special problem, constructive algorithms

Palindromic Doubles

*special problem, data structures, dp

Factorial zeros

*special problem

Chessboard

*special problem

Double Permutation Inc.

*special problem, binary search, greedy