Chess Strikes Back (hard version)

data structures, divide and conquer

Chess Strikes Back (easy version)

binary search, data structures

Inverse Genealogy

constructive algorithms, divide and conquer, dp, math, trees

New Passenger Trams

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

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Dubious Cyrpto

binary search, brute force, math, number theory

Acacius and String

brute force, implementation, strings

Cubic Lattice

geometry, math, matrices, number theory

Set Merging

constructive algorithms, divide and conquer

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

Integer Game

constructive algorithms, games, interactive, math

Inversion SwapSort

constructive algorithms, greedy, sortings

Replace by MEX

brute force, constructive algorithms, sortings

Element Extermination

constructive algorithms, data structures, greedy

Neighbor Grid

constructive algorithms, greedy

Sign Flipping

constructive algorithms, math

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Reading Books (easy version)

data structures, greedy, sortings

Zero Remainder Array

math, sortings, two pointers

Move Brackets

greedy, strings

Multiply by 2, divide by 6

math

Required Remainder

math

Pawns

data structures, divide and conquer, greedy

Network Coverage

binary search, constructive algorithms, data structures, greedy

Sum of Digits

brute force, constructive algorithms, dp, greedy

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Pluses and Minuses

math

01 Game

games

Donut Shops

greedy, implementation, math

Omkar and Modes

binary search, divide and conquer, interactive

Omkar and Last Floor

dp, greedy, two pointers

Omkar and Circle

brute force, dp, games, greedy

Omkar and Baseball

constructive algorithms, math

Omkar and Last Class of Math

greedy, math, number theory

Omkar and Completion

constructive algorithms, implementation

Raging Thunder

data structures, divide and conquer, implementation

Asterism (Hard Version)

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

Asterism (Easy Version)

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

Grid-00100

constructive algorithms, greedy, implementation

A Cookie for You

greedy, implementation, math

Magical Calendar

math

Magical Sticks

math

The Hidden Pair (Hard Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

The Hidden Pair (Easy Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Number Game

games, math, number theory

GCD Compression

constructive algorithms, math, number theory

Maximum GCD

greedy, implementation, math, number theory

BareLee

dfs and similar, dp, games

DeadLee

data structures, dfs and similar, greedy, implementation, sortings

TediousLee

dp, graphs, greedy, math, trees

RationalLee

greedy, math, sortings, two pointers

AccurateLee

greedy, implementation, strings

FashionabLee

geometry, math

Breadboard Capacity (hard version)

Breadboard Capacity (easy version)

dp, flows, greedy

Shifting Dominoes

data structures, geometry, graphs, trees

Lamps on a Circle

games, implementation, interactive, math

Ski Accidents

constructive algorithms, graphs, greedy

AND, OR and square sum

bitmasks, greedy, math

Even Picture

constructive algorithms

Codeforces Subsequences

brute force, constructive algorithms, greedy, math, strings

C+=

brute force, greedy, implementation, math

Flying Sort (Hard Version)

binary search, data structures, dp, greedy, sortings, two pointers

Flying Sort (Easy Version)

dp, greedy, two pointers

Necklace Assembly

brute force, dfs and similar, dp, graphs, greedy, number theory

Task On The Board

constructive algorithms, greedy, implementation, sortings

Social Distance

constructive algorithms, greedy, math

Even Array

greedy, math

Short Substrings

implementation, strings

Construct the String

data structures, dp, strings

Jog Around The Graph

binary search, dp, geometry, graphs

Two Arrays

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

Two Divisors

constructive algorithms, math, number theory

Palindromic Paths

greedy, math

Shuffle

math, two pointers

Shovels and Swords

binary search, greedy, math

Secure Password

bitmasks, combinatorics, constructive algorithms, interactive, math

Swaps Again

constructive algorithms, implementation, sortings

Maximum Subsequence Value

brute force, constructive algorithms

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

Matrix Game

games, greedy, implementation

X-OR

bitmasks, constructive algorithms, divide and conquer, interactive, probabilities

Ehab's Last Corollary

constructive algorithms, dfs and similar, graphs, greedy, implementation, trees

Ehab and Prefix MEXs

brute force, constructive algorithms, greedy

Most socially-distanced subsequence

greedy, two pointers

XXXXX

brute force, data structures, number theory, two pointers

Rotating Substrings

dp, strings

Tree Shuffling

dfs and similar, dp, greedy, trees

Guess The Maximums

binary search, implementation, interactive, math

Game On Leaves

games, trees

Subsequence Hate

implementation, strings

Odd Selection

brute force, implementation, math

Johnny and Another Rating Drop

bitmasks, greedy, math

Johnny and His Hobbies

bitmasks, brute force

Johnny and Ancient Computer

implementation