Permutation Separation

data structures, divide and conquer

Sum over all Substrings (Hard Version)

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

Qpwoeirut and Vertices

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

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Dogeforces

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

Till I Collapse

data structures, divide and conquer

Counting Rectangles is Fun

brute force, divide and conquer, dp

Permutations

bitmasks, divide and conquer, math

Thief in a Shop

divide and conquer, dp, fft, math

Tricky Function

data structures, divide and conquer, geometry

Preorder

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

Kingdom and its Cities

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

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Skyline Photo

data structures, divide and conquer, dp

Perfect Triples

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

No Palindromes

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

Merge Sort

constructive algorithms, divide and conquer

Nene and the Mex Operator

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

More Wrong

divide and conquer, interactive

Timofey and Black-White Tree

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

Minimal Segment Cover

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

Points on Plane

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

Counting Factorizations

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

Mike's Sequence

*special problem, divide and conquer, implementation, math

Xor Tree

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

Yet Another Minimization Problem

divide and conquer, dp

Non-Decreasing Dilemma

data structures, divide and conquer, math

One Occurrence

data structures, divide and conquer

How many trees?

combinatorics, divide and conquer, dp

0-1-Tree

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

Set To Max (Hard Version)

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

Moving Points

data structures, divide and conquer, implementation, sortings

Counting Graphs

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

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

The Bakery

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

Ciel and Gondolas

data structures, divide and conquer, dp

Pokémon Army (hard version)

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

Clear the Multiset

data structures, divide and conquer, dp, greedy

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

Max GEQ Sum

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

Array Stabilization (GCD version)

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

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

Creative Snap

binary search, brute force, divide and conquer, math

Maximum AND

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

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Maximum Subsequence

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

Beautiful Array

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

Ciel the Commander

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

Increasing Subsequences

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

Dr. Evil Underscores

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

Xenia and Tree

data structures, divide and conquer, trees

Painting Fence

divide and conquer, dp, greedy

Divide and Summarize

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

Integers Have Friends

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

Pashmak and Parmida's problem

data structures, divide and conquer, sortings

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Equivalent Strings

divide and conquer, hashing, sortings, strings

Lost Numbers

brute force, divide and conquer, interactive, math

Greetings

data structures, divide and conquer, sortings

Parsa's Humongous Tree

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

Masha and a Beautiful Tree

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

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

a-Good String

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

Permutation Transformation

dfs and similar, divide and conquer, implementation