Maximum GCD Sum Queries

brute force, dp, implementation, number theory

Cat, Fox and Maximum Array Split

brute force, interactive

Chess For Three

brute force, dp, implementation, math

Contest Proposal

brute force, greedy, two pointers

Circle Perimeter

binary search, brute force, dfs and similar, geometry, implementation, math

Min-Fund Prison (Medium)

brute force, dfs and similar, dp, graphs, trees

Arithmancy (Easy)

brute force, constructive algorithms, interactive, strings

Balanced Unshuffle (Medium)

brute force, constructive algorithms, trees

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Permutation Game

brute force, dfs and similar, games, graphs, greedy, math

Maximize?

brute force, math, number theory

Next and Prev

brute force, data structures, implementation

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, trees

Reverse Card (Hard Version)

brute force, math, number theory

Reverse Card (Easy Version)

brute force, math, number theory

Carousel of Combinations

brute force, combinatorics, dp, math, number theory

A BIT of an Inequality

bitmasks, brute force, dp, math

Nene vs. Monsters (Hard Version)

brute force, greedy, implementation, math

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Nene and the Mex Operator

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

Nene's Game

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

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Long Inversions

brute force, greedy, implementation, sortings

Help, what does it mean to be "Based"

brute force, constructive algorithms, expression parsing, implementation, sortings

Grid

brute force

They Have Fooled

brute force, schedules

No Palindromes

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

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

Nearly Shortest Repeating Substring

brute force, implementation, number theory, strings

Product of Binary Decimals

brute force, dp, implementation, number theory

Damage per Second

brute force, math

Charming Meals

binary search, brute force, greedy, sortings

Grove

brute force, dfs and similar, dp, geometry, probabilities

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Clique Partition

brute force, constructive algorithms, graphs, greedy, implementation

Tandem Repeats?

brute force, strings, two pointers

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths

Array Fix

brute force, dp, greedy, implementation

Special Characters

brute force, constructive algorithms

Birthday Gift

bitmasks, brute force, constructive algorithms, greedy, implementation

GCD is Greater

brute force, data structures, math, number theory

Left and Right Houses

brute force

MEX Game 2 (Easy Version)

binary search, brute force, greedy

Counting Is Fun (Easy Version)

brute force, combinatorics, dp, math

Farmer John's Favorite Function

brute force, data structures, implementation, math

Rudolf and 121

brute force, dp, greedy, math

Rudolf and the Ticket

brute force, math

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

Messenger in MAC

binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings

Weird LCM Operations

brute force, constructive algorithms, number theory

Yet Another Coin Problem

brute force, dp, greedy, math

Turtle Magic: Royal Turtle Shell Pattern

bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math

Turtle Fingers: Count the Values of k

brute force, implementation, math, number theory

LR-remainders

brute force, data structures, implementation, math, two pointers

Make Equal Again

brute force, greedy, math

Recovering a Small String

brute force, strings

Maximize the Difference

bitmasks, brute force, dfs and similar

Sum over all Substrings (Easy Version)

brute force, dp, greedy, strings

Permutation Printing

brute force, constructive algorithms, math

Sasha and the Wedding Binary Search Tree

brute force, combinatorics, data structures, dfs and similar, math, trees

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Sasha and the Casino

binary search, brute force, constructive algorithms, games, greedy, math

Modular Sequence

brute force, constructive algorithms, dp, graphs, greedy, math, number theory

Lonely Mountain Dungeons

brute force, data structures, greedy, math, ternary search

Physical Education Lesson

brute force, math, number theory

Find the Different Ones!

binary search, brute force, data structures, dp, dsu, greedy, two pointers

Choose the Different Ones!

brute force, greedy, math

Vlad and Avoiding X

bitmasks, brute force, dfs and similar, dp, implementation

A Balanced Problemset?

brute force, greedy, math, number theory

Shrink-Reverse

binary search, brute force, greedy, hashing, implementation, string suffix structures, strings

Berserk Monsters

brute force, data structures, dsu, implementation, math

Mischievous Shooter

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

Sum of Progression

brute force, data structures, dp, implementation, math

Eat the Chip

brute force, games, greedy, math

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Array Repetition

binary search, brute force, dsu, implementation, math

Partitioning the Array

brute force, math, number theory

Satisfying Constraints

brute force, greedy, math

Watering an Array

brute force, greedy, implementation, math

Erase First or Second Letter

brute force, combinatorics, data structures, dp, strings

Matrix Rank (Easy Version)

brute force, combinatorics, dp, math, matrices

Mathematical Problem

brute force, constructive algorithms, geometry, math

Not Quite Latin Square

bitmasks, brute force, implementation

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Game with Marbles (Easy Version)

brute force, games, greedy, sortings

Three Activities

brute force, dp, greedy, implementation, sortings

Game with Multiset

binary search, bitmasks, brute force, greedy

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Multiple Lamps

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

Lights

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Good Triples

brute force, combinatorics, number theory

Easy As ABC

brute force

Field Should Not Be Empty

brute force, data structures, divide and conquer

Set To Max (Easy Version)

brute force, constructive algorithms, greedy

Array Game

binary search, brute force, data structures, sortings, two pointers

Forked!

brute force, implementation

Maximum And Queries (easy version)

binary search, bitmasks, brute force, greedy

StORage room

bitmasks, brute force, constructive algorithms, greedy

Halloumi Boxes

brute force, greedy, sortings