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

Masha and a Beautiful Tree

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

Parsa's Humongous Tree

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

Greetings

data structures, divide and conquer, sortings

Lost Numbers

brute force, divide and conquer, interactive, math

Equivalent Strings

divide and conquer, hashing, sortings, strings

Maximum Crossings (Hard Version)

data structures, divide and conquer, 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

Divide and Summarize

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

Painting Fence

divide and conquer, dp, greedy

Xenia and Tree

data structures, divide and conquer, trees

Dr. Evil Underscores

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

Increasing Subsequences

bitmasks, constructive algorithms, divide and conquer, greedy, math

Ciel the Commander

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

Beautiful Array

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

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Maximum Subsequence

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

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

Maximum AND

bitmasks, dfs and similar, divide and conquer, greedy, sortings

Creative Snap

binary search, brute force, divide and conquer, math

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Book of Evil

dfs and similar, divide and conquer, dp, trees

Petya and Array

data structures, divide and conquer, two pointers

Array Stabilization (GCD version)

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

Max GEQ Sum

binary search, constructive algorithms, data structures, divide and conquer, implementation, two pointers

Permutation Graph

binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths

Ones and Twos

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

Clear the Multiset

data structures, divide and conquer, dp, greedy

Pokémon Army (hard version)

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

Ciel and Gondolas

data structures, divide and conquer, dp

The Bakery

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

Imbalanced Array

data structures, divide and conquer, dsu, sortings

XOR Inverse

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

Balanced Removals (Harder)

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

Counting Graphs

combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees

Moving Points

data structures, divide and conquer, implementation, sortings

Set To Max (Hard Version)

constructive algorithms, data structures, divide and conquer, greedy, implementation, sortings

How many trees?

combinatorics, divide and conquer, dp

0-1-Tree

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

One Occurrence

data structures, divide and conquer

Non-Decreasing Dilemma

data structures, divide and conquer, math

Yet Another Minimization Problem

divide and conquer, dp

Xor Tree

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

Mike's Sequence

*special problem, divide and conquer, implementation, math

Counting Factorizations

combinatorics, divide and conquer, dp, math, number theory

Points on Plane

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

Minimal Segment Cover

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

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

More Wrong

divide and conquer, interactive

Merge Sort

constructive algorithms, divide and conquer

Perfect Triples

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

Skyline Photo

data structures, divide and conquer, dp

Beautiful Subarrays

data structures, divide and conquer, strings, trees

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Vowels

combinatorics, divide and conquer, dp

Array Collapse

data structures, divide and conquer, dp, trees

Kingdom and its Cities

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

Preorder

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

Tricky Function

data structures, divide and conquer, geometry

Permutations

bitmasks, divide and conquer, math

Thief in a Shop

divide and conquer, dp, fft, math

Counting Rectangles is Fun

brute force, divide and conquer, dp

Till I Collapse

data structures, divide and conquer

Dogeforces

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

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Qpwoeirut and Vertices

binary search, data structures, dfs and similar, divide and conquer, dsu, greedy, trees

Permutation Separation

data structures, divide and conquer

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

Pudding Monsters

data structures, divide and conquer

Two Different

constructive algorithms, divide and conquer

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Fruit Sequences

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

New Year Tree

data structures, divide and conquer, trees

Ivan and Burgers

data structures, divide and conquer, greedy, math

Partition Game

binary search, data structures, divide and conquer, dp

Fib-tree

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

Addition on Segments

bitmasks, data structures, divide and conquer, dp

High Cry

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

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Binary Table

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

Sum

data structures, divide and conquer, dp, greedy

Optimal Insertion

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

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Please, another Queries on Array?

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

Alternating Tree

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

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Tests for problem D

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

GCD Counting

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

Hongcow's Game

bitmasks, divide and conquer, interactive

Yet Another Array Counting Problem

binary search, data structures, divide and conquer, dp, flows, math, trees

Greedy Shopping

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

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths