Permutation Transformation

dfs and similar, divide and conquer, implementation

Masha and a Beautiful Tree

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

Lost Numbers

brute force, divide and conquer, interactive, math

a-Good String

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

Greetings

data structures, divide and conquer, sortings

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Parsa's Humongous Tree

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

Divide and Summarize

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

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Practice

constructive algorithms, divide and conquer, implementation

Equivalent Strings

divide and conquer, hashing, sortings, strings

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

Creative Snap

binary search, brute force, divide and conquer, math

Ones and Twos

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

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

Increasing Subsequences

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

Maximum Subsequence

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

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Maximum AND

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

Petya and Array

data structures, divide and conquer, two pointers

Max GEQ Sum

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

Set To Max (Hard Version)

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

Merge Sort

constructive algorithms, divide and conquer

Permutations

bitmasks, divide and conquer, math

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Painting Fence

divide and conquer, dp, greedy

Dr. Evil Underscores

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

Beautiful Array

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

Array Stabilization (GCD version)

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

Permutation Graph

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

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Balanced Removals (Harder)

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

Moving Points

data structures, divide and conquer, implementation, sortings

How many trees?

combinatorics, divide and conquer, dp

Counting Factorizations

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

Counting Rectangles is Fun

brute force, divide and conquer, dp

Hongcow's Game

bitmasks, divide and conquer, interactive

Minimum Sum

divide and conquer, geometry, sortings

Book of Evil

dfs and similar, divide and conquer, dp, trees

XOR Inverse

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

Counting Graphs

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

Nene and the Mex Operator

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

No Palindromes

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

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Ciel the Commander

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

Pokémon Army (hard version)

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

Xor Tree

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

Points on Plane

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

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

Skyline Photo

data structures, divide and conquer, dp

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Array Collapse

data structures, divide and conquer, dp, trees

Preorder

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

Sum over all Substrings (Hard Version)

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

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Blueprint for Seating

combinatorics, divide and conquer, math

Clear the Multiset

data structures, divide and conquer, dp, greedy

The Bakery

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

0-1-Tree

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

Non-Decreasing Dilemma

data structures, divide and conquer, math

Minimal Segment Cover

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

Perfect Triples

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

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Tricky Function

data structures, divide and conquer, geometry

Permutation Separation

data structures, divide and conquer

Addition on Segments

bitmasks, data structures, divide and conquer, dp

High Cry

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

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Tests for problem D

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

ace5 and Task Order

constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings

Minibuses on Venus (easy version)

combinatorics, divide and conquer, dp

Package Delivery

data structures, divide and conquer, greedy

Mischievous Shooter

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

Paint Tree

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

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Maze 2D

data structures, divide and conquer

Dogeforces

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

Qpwoeirut and Vertices

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

Two Different

constructive algorithms, divide and conquer

Optimal Insertion

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

Alternating Tree

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

Yet Another Array Counting Problem

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

Unique Occurrences

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

Max to the Right of Min

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

Omsk Metro (hard version)

data structures, dfs and similar, divide and conquer, dp, math, trees

Decomposition

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

Superset

constructive algorithms, divide and conquer

Xenia and Tree

data structures, divide and conquer, trees

One Occurrence

data structures, divide and conquer

Thief in a Shop

divide and conquer, dp, fft, math

Till I Collapse

data structures, divide and conquer

Fruit Sequences

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

New Year Tree

data structures, divide and conquer, trees

Fib-tree

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