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

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Equivalent Strings

divide and conquer, hashing, sortings, strings

Guess The Tree

binary search, brute force, dfs and similar, divide and conquer, dsu, greedy, interactive, trees

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

Xenia and Tree

data structures, divide and conquer, trees

Painting Fence

divide and conquer, dp, greedy

Swap Dilemma

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

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

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Ciel the Commander

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

Maximum Subsequence

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

Beautiful Array

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

Maximum AND

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

Creative Snap

binary search, brute force, divide and conquer, math

Petya and Array

data structures, divide and conquer, two pointers

Book of Evil

dfs and similar, divide and conquer, dp, trees

Code For 1

constructive algorithms, dfs and similar, divide and conquer

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

Ones and Twos

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

Permutation Graph

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

Clear the Multiset

data structures, divide and conquer, dp, greedy

Ciel and Gondolas

data structures, divide and conquer, dp

The Bakery

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

Pokémon Army (hard version)

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

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Counting Graphs

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

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

Set To Max (Hard Version)

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

Moving Points

data structures, divide and conquer, implementation, sortings

Invertible Bracket Sequences

binary search, combinatorics, data structures, divide and conquer, implementation, two pointers

0-1-Tree

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

How many trees?

combinatorics, divide and conquer, dp

One Occurrence

data structures, divide and conquer

Nene and the Mex Operator

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

Yet Another Minimization Problem

divide and conquer, dp

Non-Decreasing Dilemma

data structures, divide and conquer, math

Xor Tree

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

Minimal Segment Cover

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

Counting Factorizations

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

No Palindromes

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

Points on Plane

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

Mike's Sequence

*special problem, divide and conquer, implementation, math

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

Perfect Triples

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

Skyline Photo

data structures, divide and conquer, dp

Merge Sort

constructive algorithms, divide and conquer

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Array Collapse

data structures, divide and conquer, dp, trees

Vowels

combinatorics, divide and conquer, dp

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Kingdom and its Cities

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

Tricky Function

data structures, divide and conquer, geometry

Till I Collapse

data structures, divide and conquer

Thief in a Shop

divide and conquer, dp, fft, math

Preorder

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

Level Up

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

Qpwoeirut and Vertices

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

Permutations

bitmasks, divide and conquer, math

Counting Rectangles is Fun

brute force, divide and conquer, dp

Sum over all Substrings (Hard Version)

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

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

Permutation Separation

data structures, divide and conquer

Pudding Monsters

data structures, divide and conquer

Ivan and Burgers

data structures, divide and conquer, greedy, math

Two Different

constructive algorithms, divide and conquer

Partition Game

binary search, data structures, divide and conquer, dp

Fruit Sequences

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

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

New Year Tree

data structures, divide and conquer, trees

High Cry

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

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Sum

data structures, divide and conquer, dp, greedy

Fib-tree

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

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Binary Table

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

Optimal Insertion

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

Please, another Queries on Array?

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

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Alternating Tree

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

Tests for problem D

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

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Yet Another Array Counting Problem

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

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory