Iris and the Tree

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

Alter the GCD

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

Make a Palindrome

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

Not a Nim Problem

brute force, games, math, number theory

Colored Portals

binary search, brute force, data structures, graphs, greedy, implementation, shortest paths

Game with Doors

brute force, greedy

Turtle and Three Sequences

brute force, data structures, dp, greedy, math, probabilities, two pointers

Turtle and Inversions (Hard Version)

brute force, data structures, divide and conquer, dp, greedy, math, two pointers

Turtle and Inversions (Easy Version)

brute force, divide and conquer, dp, greedy, math

Lattice Optimizing

bitmasks, brute force, hashing, meet-in-the-middle

Court Blue (Hard Version)

brute force, dp, math, number theory

Court Blue (Easy Version)

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

Cosmic Rays

brute force, data structures, dp

DFS Checker (Easy Version)

brute force, data structures, dfs and similar, graphs, hashing, trees

Black Circles

brute force, geometry, greedy, math

Longest Max Min Subsequence

brute force, constructive algorithms, data structures, greedy, implementation

Guess The Tree

binary search, brute force, dfs and similar, divide and conquer, dsu, greedy, interactive, trees

Ksyusha and the Loaded Set

binary search, brute force, data structures, implementation

Call During the Journey

binary search, brute force, graphs, greedy, shortest paths

Card Game

brute force, constructive algorithms, implementation

Eliminating Balls With Merging (Hard Version)

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

Eliminating Balls With Merging (Easy Version)

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

Perform Operations to Maximize Score

binary search, brute force, constructive algorithms, greedy, implementation

Chips on a Line

brute force, combinatorics, dp, greedy, math

Level Up

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

Strong Password

brute force, implementation, strings

Penacony

brute force, data structures, graphs, greedy, hashing

Fun

binary search, brute force, combinatorics, math, number theory

Cases

bitmasks, brute force, dp, strings

Squaring

brute force, constructive algorithms, greedy, implementation, math, number theory

Bouquet (Easy Version)

binary search, brute force, greedy, sortings, two pointers

Diagonals

brute force, greedy, implementation, math

Minecraft

bitmasks, brute force, dp, graphs, math

Dyn-scripted Robot (Easy Version)

brute force, chinese remainder theorem, constructive algorithms, math, number theory

Valuable Cards

brute force, dp, greedy, number theory, two pointers

Novice's Mistake

brute force, constructive algorithms, implementation, math, strings

Only Pluses

brute force, constructive algorithms, greedy, math, sortings

Triangle Formation

brute force, greedy, implementation, math, sortings

Polygonal Segments

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

Grid Puzzle

bitmasks, brute force, dp, greedy, implementation

Mad MAD Sum

brute force, greedy, math

Submission Bait

brute force, games, greedy, sortings

Smithing Skill

brute force, data structures, dp, greedy, math, sortings, two pointers

Substring and Subsequence

brute force, greedy, strings

Range Minimum Sum

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

The Omnipotent Monster Killer

brute force, dfs and similar, dp, trees

Split the Multiset

brute force, greedy, implementation, math

Wonderful Tree!

brute force, data structures, dfs and similar, dsu, greedy, trees

Permutation Problem (Hard Version)

brute force, data structures, hashing, math, number theory

Permutation Problem (Simple Version)

binary search, brute force, combinatorics, data structures, math, number theory

Mathematical Problem

brute force, dp, greedy, implementation, math, two pointers

Matrix Stabilization

brute force, data structures, greedy, sortings

X Axis

brute force, geometry, math, sortings

Maximize the Largest Component (Easy Version)

brute force, data structures, dfs and similar, dsu, graphs, implementation

Secret Box

brute force, combinatorics, math

Maximum Multiple Sum

brute force, math, number theory

Reconstruction

brute force, dp, math

''a'' String Problem

brute force, hashing, implementation, math, string suffix structures, strings

Your Loss

bitmasks, brute force, dp, trees

Have Your Cake and Eat It Too

binary search, brute force, greedy, implementation

Number of k-good subarrays

bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle

Beauty of the mountains

brute force, data structures, implementation, math, number theory

Collatz Conjecture

brute force, implementation, math, number theory

Turtle and an Incomplete Sequence

bitmasks, brute force, constructive algorithms, greedy, implementation, math

Turtle and Piggy Are Playing a Game

brute force, greedy, math

Kostyanych's Theorem

brute force, constructive algorithms, graphs, interactive

Fixing a Binary String

bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings

Guess the Maximum

brute force, greedy, implementation

Computing Machine

brute force, data structures, dp, greedy, implementation

XORificator

bitmasks, brute force, greedy, hashing

Nikita and LCM

brute force, data structures, dp, greedy, math, number theory, sortings

Set

bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math

Paint the Tree

brute force, dfs and similar, dp, greedy, shortest paths, trees

Chamo and Mocha's Array

binary search, brute force, greedy

378QAQ and Mocha's Array

brute force, greedy, math, sortings

Bazoka and Mocha's Array

brute force, greedy, implementation, sortings

Cutting Game

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

Maximum GCD Sum Queries

bitmasks, brute force, dp, implementation, number theory

Cat, Fox and Maximum Array Split

brute force, interactive, math

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