Magic Matrix

brute force, divide and conquer, graphs, matrices, trees

Magician and Pigs (Easy Version)

brute force, data structures, implementation

Hongcow Buys a Deck of Cards

bitmasks, brute force, dp

Carousel of Combinations

brute force, combinatorics, dp, math, number theory

Bacterial Melee

brute force, combinatorics, dp, string suffix structures

Rat Kwesh and Cheese

brute force, constructive algorithms, math

Two Permutations (Easy Version)

brute force, constructive algorithms, greedy, number theory

Maximum Matching

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

Pave the Parallelepiped

bitmasks, brute force, combinatorics, math, number theory

Minimum Modular

brute force, graphs, math, number theory

Prefix Sums

binary search, brute force, combinatorics, math, matrices

Mighty Rock Tower

brute force, combinatorics, dp, math, probabilities

Cinema

brute force, data structures

Lihmuf Balling

binary search, brute force, math

Magical Permutation

bitmasks, brute force, constructive algorithms, data structures, graphs, math

Geometrical Progression

brute force, math, number theory

Project Manager

brute force, data structures, implementation

Cube Problem

brute force, math, number theory

Balanced Unshuffle (Medium)

brute force, constructive algorithms, trees

Rectangles and Square

brute force, dp

Plane of Tanks: Duel

brute force, dp, math, probabilities

Domino

brute force, implementation

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Subset Sums

brute force, data structures

Fuzzy Search

bitmasks, brute force, fft

Xor of 3

brute force, constructive algorithms, greedy, two pointers

Maximum Monogonosity

brute force, dp, math

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Two Editorials

brute force, dp, greedy, sortings, two pointers

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

MinimizOR

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

Complete the MST

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

Sanae and Giant Robot

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

Strange Shuffle

binary search, brute force, constructive algorithms, interactive

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

XOR Triangle

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

Bash Plays with Functions

brute force, combinatorics, dp, number theory

Expected diameter of a tree

binary search, brute force, dfs and similar, dp, sortings, trees

Rollbacks (Easy Version)

brute force, data structures, dfs and similar, trees

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Removing Graph

brute force, dp, games, graphs, math

LCM Sum (hard version)

brute force, data structures, math, number theory, two pointers

Almost Fault-Tolerant Database

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

ANDfinity

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

Summer Earnings

binary search, bitmasks, brute force, geometry, sortings

Text Editor

brute force, dp, greedy, strings

Cats on the Upgrade (easy version)

brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees

Curious Array

brute force, combinatorics, implementation, math

Doremy's Experimental Tree

brute force, constructive algorithms, dfs and similar, dsu, sortings, trees

Narrow Components

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

Lottery

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

Smooth Sailing (Easy Version)

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

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Balancing Weapons

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

The Neutral Zone

brute force, math

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Serval and Music Game

brute force, dp, implementation, math, number theory

Hossam and a Letter

brute force, dp, implementation, two pointers

Function Sum

brute force, combinatorics, dp, fft, math

Multiset of Strings

bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees

Perun, Ult!

brute force, greedy, sortings

Typewriter

brute force, math

Fetch the Treasure

brute force, data structures, graphs, shortest paths

Polycarpus the Safecracker

brute force, dp

Interactive Factorial Guessing

brute force, games, implementation, interactive

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Azembler

brute force, implementation

Igor and Interesting Numbers

brute force, combinatorics, dp, math

Dividing Kingdom

binary search, brute force, data structures

Savior

brute force, dsu, math

Rhombus

brute force, data structures, dp

Digits

brute force, implementation, math

Shaass and Painter Robot

brute force, implementation, number theory

Cycle

brute force, dfs and similar, implementation

Interactive Bulls and Cows (Hard)

brute force, constructive algorithms, interactive

Two Circles

brute force, data structures, implementation

Lift and Throw

brute force

Machine Learning

brute force, data structures

Binary Table

bitmasks, brute force, divide and conquer, dp, fft, math

Ehab's REAL Number Theory Problem

brute force, dfs and similar, graphs, number theory, shortest paths

Lizards and Basements 2

brute force, dp

Rebrending

brute force, data structures, divide and conquer, implementation

Palindrome Partition

binary search, brute force, data structures, dp, hashing, strings

Mathematics Curriculum

brute force, combinatorics, dp, trees

Twin Clusters

bitmasks, brute force, constructive algorithms, math, probabilities

Bring Balance

brute force, constructive algorithms, greedy

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Tree Recovery

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

Serega the Pirate

brute force, constructive algorithms

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Wise Men (Easy Version)

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

Playoff Restoration

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

Matrix Sorting

bitmasks, brute force, constructive algorithms, greedy, two pointers

Vika and Stone Skipping

brute force, implementation, math, number theory

Vova Escapes the Matrix

brute force, dfs and similar, divide and conquer, shortest paths

Min Cost Permutation (Easy Version)

brute force, constructive algorithms, greedy, math

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings