Say No to Palindromes

brute force, constructive algorithms, dp, strings

Strange Function

math, number theory

PriceFixed

binary search, greedy, implementation, sortings, two pointers

Erase and Extend (Easy Version)

binary search, brute force, dp, greedy, hashing, implementation, string suffix structures, strings, two pointers

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

Sequence Pair Weight

hashing, implementation, math

Potions (Hard Version)

data structures, greedy

Compression and Expansion

brute force, data structures, greedy, implementation, trees

Guess the K-th Zero (Easy version)

binary search, interactive

Maximum Sum of Products

brute force, dp, implementation, math, two pointers

Product 1 Modulo N

greedy, number theory

Add One

dp, matrices

Permutation by Sum

brute force, greedy, math

Min Cost String

brute force, constructive algorithms, graphs, greedy, strings

DMCA

*special problem, implementation, number theory

Balance the Bits

constructive algorithms, greedy

Planar Reflections

brute force, data structures, dp

k-LCM (hard version)

constructive algorithms, math

Guessing the Greatest (easy version)

binary search, interactive

Basic Diplomacy

brute force, constructive algorithms, greedy, implementation

Fence Painting

brute force, constructive algorithms, greedy

Longest Simple Cycle

dp, graphs, greedy

Advertising Agency

combinatorics, math, sortings

Building a Fence

dp, greedy, implementation, two pointers

The Robot

brute force, implementation

Divide and Summarize

binary search, brute force, data structures, divide and conquer, implementation, sortings

Row GCD

math, number theory

Sequence and Swaps

dp, greedy, sortings

Radio Towers

combinatorics, dp, math

Minimal Height Tree

graphs, greedy, shortest paths, trees

Black Friday

*special problem, implementation

Lonely Numbers

binary search, math, number theory, two pointers

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

Good Subarrays

data structures, dp, math

Multiples of Length

constructive algorithms, greedy, number theory

Boboniu and Bit Operations

bitmasks, brute force, dp, greedy

Array Walk

brute force, dp, greedy

Reading Books (easy version)

data structures, greedy, sortings

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Grid-00100

constructive algorithms, greedy, implementation

Ehab and Prefix MEXs

brute force, constructive algorithms, greedy

Game On Leaves

games, trees

Celex Update

math

Constructing the Array

constructive algorithms, data structures, sortings

Special Permutation

constructive algorithms

Orac and LCM

data structures, math, number theory

Phoenix and Distribution

constructive algorithms, greedy, sortings, strings

Constructing the Dungeon

*special problem, graphs, greedy

Spring Cleaning

*special problem, greedy, sortings

Hilbert's Hotel

math, number theory, sortings

Yet Another Counting Problem

math, number theory

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Circle of Monsters

brute force, constructive algorithms, greedy, math

Game with Chips

constructive algorithms, implementation

Remove Adjacent

brute force, constructive algorithms, greedy, strings

Kuroni and Impossible Calculation

brute force, combinatorics, math, number theory

Perfect Keyboard

dfs and similar, greedy, implementation

Obtain The String

dp, greedy, strings

MEX maximizing

data structures, greedy, implementation, math

Mind Control

brute force, data structures, implementation

Two Arrays

combinatorics, dp

New Year and Permutation

combinatorics, math

K for the Price of One (Hard Version)

dp, greedy, sortings

Azamon Web Services

greedy

League of Leesins

constructive algorithms, implementation

Even Path

data structures, implementation

Minimize The Integer

greedy, two pointers

Character Swap (Hard Version)

strings

Standard Free2play

dp, greedy, math

Distinct Characters Queries

data structures

Optimal Subsequences (Easy Version)

data structures, greedy

p-binary

bitmasks, brute force, math

Save the Nature

binary search, greedy

Zmei Gorynich

greedy, math

Equalizing by Division (hard version)

brute force, math, sortings

Remove the Substring (easy version)

greedy, implementation

Welfare State

binary search, brute force, data structures, sortings

MP3

sortings, two pointers

RGB Substring (hard version)

data structures, dp, implementation, two pointers

Add on a Tree

trees

Parallel Universes (Easy)

implementation

Heidi and the Turing Test (Easy)

implementation

Electrification

binary search, brute force, greedy

Catch Overflow!

data structures, expression parsing, implementation

Two Arrays and Sum of Functions

greedy, math, sortings

Almost All Divisors

math, number theory

Cat Party (Hard Edition)

data structures, implementation

Stas and the Queue at the Buffet

greedy, math, sortings

Dima and a Bad XOR

bitmasks, brute force, constructive algorithms, dp

Born This Way

binary search, brute force, two pointers

Playlist

brute force, data structures, sortings

Camp Schedule

greedy, hashing, strings

Skyscrapers

implementation, sortings

Spanning Tree with Maximum Degree

graphs

System Testing

implementation

Chessboard unitary

*special problem

Palindrome checker oracle

*special problem

OR oracle

*special problem

Sasha and a Bit of Relax

dp, implementation