Arrays Sum

constructive algorithms, greedy, math

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

Big Vova

brute force, greedy, math, number theory

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Balanced Bitstring

implementation, strings

Mere Array

constructive algorithms, math, number theory, sortings

Binary String Reconstruction

2-sat, brute force, constructive algorithms, greedy

RPG Protagonist

brute force, greedy, math

Binary String To Subsequences

constructive algorithms, data structures, greedy, implementation

Good Subarrays

data structures, dp, math

Power Sequence

brute force, math, number theory, sortings

Multiples of Length

constructive algorithms, greedy, number theory

Boboniu and Bit Operations

bitmasks, brute force, dp, greedy

Pinkie Pie Eats Patty-cakes

constructive algorithms, greedy, math, sortings

Applejack and Storages

constructive algorithms, data structures, greedy, implementation

Omkar and Bed Wars

dp, greedy

Cyclic Permutations

combinatorics, dp, graphs, math

Good String

brute force, dp, greedy, two pointers

Array Walk

brute force, dp, greedy

a-Good String

bitmasks, brute force, divide and conquer, dp, implementation

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

Create The Teams

brute force, dp, greedy, implementation, sortings

Universal Solution

greedy

Dubious Cyrpto

binary search, brute force, math, number theory

Acacius and String

brute force, implementation, strings

Element Extermination

constructive algorithms, data structures, greedy

Reading Books (easy version)

data structures, greedy, sortings

Zero Remainder Array

math, sortings, two pointers

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Pluses and Minuses

math

Omkar and Baseball

constructive algorithms, math

Omkar and Last Class of Math

greedy, math, number theory

Grid-00100

constructive algorithms, greedy, implementation

A Cookie for You

greedy, implementation, math

Number Game

games, math, number theory

RationalLee

greedy, math, sortings, two pointers

AND, OR and square sum

bitmasks, greedy, math

Even Picture

constructive algorithms

Codeforces Subsequences

brute force, constructive algorithms, greedy, math, strings

Social Distance

constructive algorithms, greedy, math

Palindromic Paths

greedy, math

Shuffle

math, two pointers

Solve The Maze

constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, shortest paths

Rotation Matching

constructive algorithms, data structures, greedy, implementation

Trouble Sort

constructive algorithms, implementation

Ehab and Prefix MEXs

brute force, constructive algorithms, greedy

Most socially-distanced subsequence

greedy, two pointers

Game On Leaves

games, trees

Subsequence Hate

implementation, strings

Johnny and Another Rating Drop

bitmasks, greedy, math

Johnny and Contribution

constructive algorithms, graphs, greedy, sortings

Spy-string

bitmasks, brute force, constructive algorithms, dp, hashing, strings

Polygon

dp, graphs, implementation, shortest paths

Buying Shovels

math, number theory

Mixing Water

binary search, math

Celex Update

math

Game With Array

constructive algorithms, math

Simple Polygon Embedding

binary search, geometry, math, ternary search

Constructing the Array

constructive algorithms, data structures, sortings

Special Permutation

constructive algorithms

Binary String Reconstruction

constructive algorithms, dfs and similar, math

Special Elements

brute force, implementation, two pointers

Alice, Bob and Candies

implementation

Skier

data structures, implementation

Orac and Models

dp, math, number theory

Orac and LCM

data structures, math, number theory

Phoenix and Distribution

constructive algorithms, greedy, sortings, strings

Phoenix and Beauty

constructive algorithms, data structures, greedy, sortings

Magic Tricks

*special problem, dp, graphs

Constructing the Dungeon

*special problem, graphs, greedy

Spring Cleaning

*special problem, greedy, sortings

Boot Camp

*special problem, greedy

Hilbert's Hotel

math, number theory, sortings

Constant Palindrome Sum

brute force, data structures, greedy, two pointers

Yet Another Counting Problem

math, number theory

Nastya and Door

greedy, implementation

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

Nastya and Strange Generator

brute force, data structures, greedy, implementation

Powered Addition

greedy, math

Xenia and Colorful Gems

binary search, greedy, math, sortings, two pointers

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Three Blocks Palindrome (easy version)

binary search, brute force, data structures, dp, two pointers

Anti-Sudoku

constructive algorithms, implementation

Circle of Monsters

brute force, constructive algorithms, greedy, math

Eugene and an array

binary search, data structures, implementation, two pointers

Walk on Matrix

bitmasks, constructive algorithms, math

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Composite Coloring

brute force, constructive algorithms, greedy, math, number theory

Dreamoon Likes Permutations

implementation, math

Dreamoon Likes Sequences

bitmasks, combinatorics, math

K-th Beautiful String

binary search, brute force, combinatorics, implementation, math

Game with Chips

constructive algorithms, implementation

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Permutation Partitions

combinatorics, greedy, math

Ehab the Xorcist

bitmasks, constructive algorithms, greedy, number theory

Ehab and Path-etic MEXs

constructive algorithms, dfs and similar, greedy, trees

Sleeping Schedule

dp, implementation

Pair of Topics

binary search, data structures, sortings, two pointers