Permutation Transformation

dfs and similar, divide and conquer, implementation

a-Good String

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

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Parsa's Humongous Tree

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

Equivalent Strings

divide and conquer, hashing, sortings, strings

Lost Numbers

brute force, divide and conquer, interactive, math

Divide and Summarize

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

Pashmak and Parmida's problem

data structures, divide and conquer, sortings

Integers Have Friends

binary search, data structures, divide and conquer, math, number theory, two pointers

Painting Fence

divide and conquer, dp, greedy

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Creative Snap

binary search, brute force, divide and conquer, math

Beautiful Array

brute force, data structures, divide and conquer, dp, greedy

Xenia and Tree

data structures, divide and conquer, trees

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Book of Evil

dfs and similar, divide and conquer, dp, trees

Petya and Array

data structures, divide and conquer, two pointers

Maximum Subsequence

bitmasks, divide and conquer, meet-in-the-middle

Array Stabilization (GCD version)

binary search, brute force, data structures, divide and conquer, number theory, two pointers

Clear the Multiset

data structures, divide and conquer, dp, greedy

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Balanced Removals (Harder)

binary search, constructive algorithms, divide and conquer, greedy, implementation, sortings

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Moving Points

data structures, divide and conquer, implementation, sortings

Ciel and Gondolas

data structures, divide and conquer, dp

The Bakery

binary search, data structures, divide and conquer, dp, two pointers

Non-Decreasing Dilemma

data structures, divide and conquer, math

How many trees?

combinatorics, divide and conquer, dp

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

0-1-Tree

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

Mike's Sequence

divide and conquer, implementation, math

Permutations

bitmasks, divide and conquer, math

Merge Sort

constructive algorithms, divide and conquer

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Skyline Photo

data structures, divide and conquer, dp

Counting Rectangles is Fun

brute force, divide and conquer, dp

One Occurrence

data structures, divide and conquer

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

Tricky Function

data structures, divide and conquer, geometry

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Permutation Separation

data structures, divide and conquer

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Two Different

constructive algorithms, divide and conquer

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Yet Another Minimization Problem

divide and conquer, dp

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Fruit Sequences

binary search, data structures, divide and conquer, dp, two pointers

Thief in a Shop

divide and conquer, dp, fft, math

New Year Tree

data structures, divide and conquer, trees

Till I Collapse

data structures, divide and conquer

Fib-tree

brute force, dfs and similar, divide and conquer, number theory, trees

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Vowels

combinatorics, divide and conquer, dp

High Cry

binary search, bitmasks, combinatorics, data structures, divide and conquer

Kingdom and its Cities

dfs and similar, divide and conquer, dp, graphs, sortings, trees

Hongcow's Game

bitmasks, divide and conquer, interactive

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Optimal Insertion

data structures, divide and conquer, dp, greedy, sortings

Binary Table

bitmasks, brute force, divide and conquer, dp, fft, math

Tests for problem D

constructive algorithms, dfs and similar, divide and conquer, trees

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Pudding Monsters

data structures, divide and conquer

Please, another Queries on Array?

bitmasks, data structures, divide and conquer, math, number theory

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Partition Game

binary search, data structures, divide and conquer, dp

Practice

constructive algorithms, divide and conquer, implementation

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

Greedy Shopping

binary search, data structures, divide and conquer, greedy, implementation

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Ray in the tube

data structures, divide and conquer, dp, math

Ivan and Burgers

data structures, divide and conquer, greedy, math

Fairy

dfs and similar, divide and conquer, dsu

Sum

data structures, divide and conquer, dp, greedy

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Lucky Tickets

divide and conquer, dp, fft

Package Delivery

data structures, divide and conquer, greedy

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Bear and Bowling 4

binary search, data structures, divide and conquer, geometry, ternary search

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Close Vertices

data structures, divide and conquer, trees

Goodbye Souvenir

data structures, divide and conquer

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

X-OR

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

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Minimum Sum

divide and conquer, geometry, sortings

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Permutation

data structures, divide and conquer, hashing