Make it Zigzag

constructive algorithms, greedy

Notelock

greedy, two pointers

Odd Queries on Odd Array

bitmasks, brute force, data structures, implementation, trees

Zero Trailing Factorial

brute force, math, number theory

Not Alone

dp, greedy

Symmetrical Polygons

constructive algorithms, geometry, greedy, implementation, sortings

Bitwise Reversion

bitmasks, greedy

Circle of Apple Trees

greedy, sortings

Victorious Coloring (Hard Version)

data structures, greedy, schedules

Victorious Coloring (Easy Version)

dfs and similar, dp, greedy

Query Jungle

data structures, implementation, math, matrices, trees

Triple Attack

data structures, greedy

Monotone Subsequence

constructive algorithms, graphs, greedy, interactive, math

Division Versus Addition

games, greedy, math

Triple Removal

data structures, greedy, math

Catching the Krug

games

Increase or Smash

greedy, implementation

Incremental Stay

greedy, implementation, math

Incremental Subarray

math, strings

Counting Is Fun: The Finale

combinatorics, implementation

Cycle Closing

constructive algorithms, graphs, implementation, shortest paths, trees

Hidden Single (Version 2)

binary search, divide and conquer, interactive, math, probabilities

Hidden Single (Version 1)

divide and conquer, interactive, math, probabilities, sortings

Attraction Theory

combinatorics, dp, math

Limited Edition Shop

data structures, dp

Grid Counting

combinatorics, implementation, math

Incremental Path

data structures, hashing, implementation

Buratsuta 3

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

Nezuko in the Clearing

binary search, math, ternary search

Hidden Knowledge of the Ancients

data structures, two pointers

A and B

strings

MEX rose

greedy

Unconventional Pairs

greedy, sortings

Be Positive

math

Farmer John's Last Wish

binary search, data structures, math, number theory

Gravity Falls

greedy, implementation, sortings

Split

binary search, data structures, two pointers

Destruction of the Dandelion Fields

constructive algorithms, greedy, sortings

Pacer

greedy, math

Lasers

geometry

Sublime Sequence

brute force, hashing, math

Longest Increasing Path (Hard Version)

constructive algorithms, math

Longest Increasing Path (Easy Version)

constructive algorithms, math

Maxflow GCD Coloring

constructive algorithms, flows, graphs

Modular Tetration

combinatorics, math, number theory

Exchange Queries

combinatorics, data structures, greedy

Maximum OR Popcount

binary search, bitmasks, brute force, data structures, greedy

Game on Array

games, greedy

Rabbits

constructive algorithms, dp, greedy, implementation

Multiple Construction

constructive algorithms

Shortest Increasing Path

constructive algorithms, greedy

Bubble Sort

brute force, combinatorics, dp

Yet Another MEX Problem

brute force, constructive algorithms, data structures, divide and conquer, greedy, hashing

Max Sum OR (Hard Version)

bitmasks, constructive algorithms, divide and conquer, greedy

Max Sum OR (Easy Version)

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

Wrong Binary Search

binary search, constructive algorithms

Merging the Sets

greedy, implementation

Equal Occurrences

brute force, greedy, implementation

Cost of Coloring

combinatorics, divide and conquer, dp, fft, math

Long Journey

dfs and similar, divide and conquer, dp, graphs, greedy, math, matrices, number theory

Predicting Popularity

binary search, data structures, greedy, sortings

Inversion Value of a Permutation

constructive algorithms, dfs and similar, dp

Monocarp's String

binary search, greedy, strings

Deck of Cards

greedy, implementation

Candies for Nephews

math

Bracket Groups

brute force, constructive algorithms, dp, string suffix structures, strings

Looking at Towers (difficult version)

combinatorics, data structures, dp

Looking at Towers (easy version)

combinatorics, dp

Price Tags

brute force, dp, math

Non-Descending Arrays

combinatorics, dp, math

Maximum Cost Permutation

constructive algorithms, greedy

Cut the Array

brute force, constructive algorithms, math, number theory

Increasing Xor

bitmasks, data structures, math

Make Good

constructive algorithms, greedy, math, strings

Inversion Graph Coloring (Hard Version)

binary search, combinatorics, data structures, dp, two pointers

Inversion Graph Coloring (Easy Version)

combinatorics, data structures, dp, greedy, two pointers

Max Tree

constructive algorithms, dfs and similar, graphs, greedy

Discounts

greedy, sortings, two pointers

All Lengths Subtraction

brute force, two pointers

Color the Tree

*special problem

Merging Vertices in a Graph

*special problem, dfs and similar, dsu, graphs

Good Robot Paths

*special problem, data structures, geometry, sortings

Array Reduction

*special problem, greedy

Perfect Cut

*special problem, dp, greedy

Avoid Minimums

*special problem, greedy, math

Minimum on Subarrays

*special problem, brute force

Games

*special problem, greedy

Furniture Store

*special problem, implementation

Sum Minimisation

number theory

Prime Gaming (Hard Version)

bitmasks, combinatorics, dp, probabilities

Prime Gaming (Easy Version)

bitmasks, combinatorics, dp

A Cruel Segment's Thesis

data structures, greedy, sortings

Ultimate Value

data structures, games, greedy

Another Divisibility Problem

constructive algorithms, math, number theory

Shift Sort

greedy, sortings

Cake Collection

greedy

Maple and Multiplication

greedy, math

Ode to the Bridge Builder

constructive algorithms, geometry

Determinant Construction (Hard Version)

brute force, constructive algorithms, math, matrices, number theory

Determinant Construction (Easy Version)

brute force, constructive algorithms, math, matrices, number theory