Zigu Zagu

constructive algorithms, data structures, greedy

Cross Xor

constructive algorithms, graphs, math, matrices

Checker for Array Shuffling

constructive algorithms, dfs and similar, graphs

Array Shuffling

constructive algorithms, graphs, greedy

notepad.exe

binary search, constructive algorithms, greedy, interactive

Cyclic Rotation

constructive algorithms, greedy, implementation, two pointers

Permutation Counting

brute force, combinatorics, dp, fft, math

Preorder

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

Insert a Progression

brute force, constructive algorithms, greedy

Jee, You See?

bitmasks, combinatorics, dp

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Very Suspicious

binary search, brute force, geometry, greedy, implementation, math

Where is the Pizza?

data structures, dfs and similar, dsu, graphs, implementation, math

Yin Yang

implementation

Centroid Probabilities

combinatorics, dp, fft, math

Edge Elimination

constructive algorithms, dfs and similar, dp, trees

Half Queen Cover

constructive algorithms, math

Optimal Partition

data structures, dp

Labyrinth

dfs and similar, graphs

Kingdom Partition

flows

Job Lookup

constructive algorithms, dp, shortest paths, trees

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

Heroes of Might

math

Global Warming

geometry, math

Fancy Stack

combinatorics, dp, implementation

Even Split

binary search, constructive algorithms, greedy, math

Connect the Points

brute force, constructive algorithms, geometry

Budget Distribution

Admissible Map

MinimizOR

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

GCD Guess

bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory

Tree Infection

binary search, greedy, sortings, trees

Teleporters

binary search, greedy

Narrow Components

brute force, data structures, dp, dsu, math, trees

Progressions Covering

data structures, greedy

Water the Trees

binary search, greedy, math

Promising String (hard version)

data structures, implementation, math, strings

Promising String (easy version)

brute force, implementation, math, strings

Matrix and Shifts

brute force, constructive algorithms, greedy, implementation

Maximum Product Strikes Back

brute force, implementation, math, two pointers

Tree and Permutation Game

dfs and similar, games, graphs, trees

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Reverse Sort Sum

constructive algorithms, data structures, greedy, implementation, math, two pointers

Line Empire

binary search, brute force, dp, greedy, implementation, math

Juju and Binary String

brute force, constructive algorithms, greedy, math

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

388535 (Hard Version)

bitmasks, brute force, data structures, math

388535 (Easy Version)

bitmasks, math

Shinju and the Lost Permutation

constructive algorithms, math

Words on Tree

2-sat, dfs and similar, dsu, graphs, trees

Star MST

combinatorics, dp, graph matchings, math

For Gamers. By Gamers.

binary search, brute force, greedy, math, sortings

Neighbour Ordering

constructive algorithms, graphs

Equal LCM Subsets

data structures, math, number theory

Cycle Palindrome

constructive algorithms, graphs, math

Parametric MST

binary search, constructive algorithms, graphs, greedy, math, sortings

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

K-good

constructive algorithms, math, number theory

Three Minimums

combinatorics, constructive algorithms, divide and conquer, dp, fft, math

Snowy Mountain

data structures, dfs and similar, graphs, greedy, shortest paths, trees

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

Arithmetic Operations

brute force, data structures, graphs, math

Potion Brewing Class

dfs and similar, math, number theory, trees

Alice and the Cake

data structures, greedy, implementation, sortings

Tower Defense

binary search, brute force, data structures

Sum of Matchings

brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math

Nearest Excluded Points

binary search, data structures, dfs and similar, graphs, shortest paths

Fault-tolerant Network

brute force, data structures, implementation

Counting Shortcuts

data structures, dfs and similar, dp, graphs, shortest paths

Vitaly and Advanced Useless Algorithms

dp, greedy, implementation

Rescheduling the Exam

binary search, data structures, greedy, implementation, math, sortings

Two Avenues

data structures, dfs and similar, graphs

Air Reform

data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees

Serious Business

data structures, divide and conquer, dp, implementation, shortest paths

Tyler and Strings

combinatorics, data structures, implementation

Integral Array

brute force, constructive algorithms, data structures, math

Weird Sum

combinatorics, data structures, geometry, math, matrices, sortings

Madoka and Laziness

dp, greedy

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Madoka and the Best School in Russia

constructive algorithms, dp, math, number theory

Playing Around the Table

constructive algorithms, greedy, implementation

Power Board

brute force, dp, math, number theory

Weight the Tree

constructive algorithms, dfs and similar, dp, implementation, trees

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

Basis

combinatorics, fft, math, number theory

Expand the Path

brute force, combinatorics, data structures, implementation, math

Cross Coloring

data structures, implementation, math

Increase Subarray Sums

brute force, dp, greedy, implementation

Covering Circle

geometry

Special Positions

combinatorics, divide and conquer, fft, math

Two Arrays

bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers

Anonymity Is Important

binary search, brute force, data structures, dsu, greedy, sortings

Repetitions Decoding

constructive algorithms, implementation, sortings

Two Posters

brute force, data structures, greedy, two pointers

Colorful Operations

brute force, data structures, implementation

Big Brush

constructive algorithms, data structures, greedy, implementation

Minimize Inversions Number

data structures, greedy, math, sortings

Birthday

constructive algorithms, greedy, math

Towers

constructive algorithms, dfs and similar, dp, greedy, trees

Best Pair

binary search, brute force, implementation