Tea Blend

hashing, math, number theory

The Projections of Paco

dfs and similar, dp, hashing, implementation, math

Come Be My Friend, Don't Be So Scared (Hard Version)

constructive algorithms, data structures, dsu, graphs, hashing, trees, two pointers

Paths on a Grid

data structures, dp, hashing

String Cutting

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

A Trivial String Problem

brute force, dp, hashing, string suffix structures, strings

Binary Search with One Swap

binary search, divide and conquer, dp, hashing, math, two pointers

Monotone Monochrome Matrices (Hard Version)

constructive algorithms, data structures, hashing, math

Monotone Monochrome Matrices (Medium Version)

data structures, hashing

deCH OR Dations

bitmasks, data structures, dp, hashing, probabilities

Shuffling Cards with Problem Solver 68!

hashing, string suffix structures, strings

Incremental Path

data structures, hashing, implementation

Sublime Sequence

brute force, hashing, math

Yet Another MEX Problem

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

To the Infinity

data structures, hashing, math, trees

Famous Choreographer

hashing, implementation, strings

Shifts and Swaps

data structures, graphs, hashing, trees

Fewer Batteries

binary search, dfs and similar, dp, graphs, greedy, hashing

Palindrome Shuffle

binary search, greedy, hashing, strings, two pointers

Counting Is Not Fun (Easy Version)

combinatorics, data structures, dfs and similar, dp, dsu, graphs, hashing, implementation, math, trees

Stop Gaming (Hard Version)

brute force, constructive algorithms, data structures, hashing, strings

Stop Gaming (Easy Version)

brute force, constructive algorithms, greedy, hashing, strings

Cosmic Divide

brute force, geometry, hashing, math, strings

Naive String Splits

binary search, brute force, greedy, hashing, math, number theory, strings

Auto Complete

binary search, data structures, hashing, implementation, sortings, strings, trees

Polyathlon

binary search, data structures, hashing, string suffix structures, strings

Permutations Harmony

combinatorics, constructive algorithms, greedy, hashing, math

C+K+S

constructive algorithms, dfs and similar, graphs, greedy, hashing, implementation, strings

Bitwise Balancing

bitmasks, hashing, implementation, math, schedules, ternary search

Robin Hood Archery

data structures, divide and conquer, greedy, hashing

Message Transmission Error (hard version)

hashing, string suffix structures, strings, two pointers

Lattice Optimizing

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

DFS Checker (Hard Version)

binary search, data structures, dfs and similar, graphs, hashing, trees

DFS Checker (Easy Version)

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

Penacony

brute force, data structures, graphs, greedy, hashing

Fortnite

combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings

Permutation Problem (Hard Version)

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

''a'' String Problem

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

Permutation of Rows and Columns

constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings

Fixing a Binary String

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

XORificator

bitmasks, brute force, greedy, hashing

Card Pairing

dp, greedy, hashing, implementation

Division + LCP (hard version)

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

Division + LCP (easy version)

binary search, data structures, dp, hashing, string suffix structures, strings

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

Frequency Mismatch (Easy Version)

binary search, data structures, divide and conquer, hashing, probabilities, trees

No Palindromes

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

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

Non-Palindromic Substring

hashing, implementation, math, strings

Shrink-Reverse

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

Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Palindromic Problem

binary search, data structures, hashing, string suffix structures, strings

Pumping Lemma

hashing, strings

Button Pressing

bitmasks, constructive algorithms, hashing

Yarik and Musical Notes

hashing, math, number theory

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

Most Different Tree

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

Binary String Copying

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

Character Blocking

data structures, hashing, implementation

Hyperregular Bracket Strings

combinatorics, greedy, hashing, math, number theory, sortings

Palindrome Partition

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

Gasoline prices

data structures, divide and conquer, dsu, hashing, trees

Symmetree

dfs and similar, hashing, implementation, trees

Dasha and Nightmares

bitmasks, hashing, meet-in-the-middle, strings

Remove Two Letters

data structures, greedy, hashing, strings

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Fixed Prefix Permutations

binary search, bitmasks, data structures, hashing, math, sortings

Delicious Dessert

binary search, dsu, hashing, math, number theory, string suffix structures

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Kazaee

data structures, hashing, probabilities

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Meta-set

brute force, combinatorics, data structures, hashing, math

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Kirei and the Linear Function

hashing, math

Prefix Function Queries

dfs and similar, dp, hashing, string suffix structures, strings, trees

Magical Array

constructive algorithms, hashing, implementation, math

Required Length

brute force, dfs and similar, dp, hashing, shortest paths

Preorder

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

Gojou and Matrix Game

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

Minimal String Xoration

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

Weight of the System of Nested Segments

greedy, hashing, implementation, sortings

Two Arrays

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

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Masha-forgetful

brute force, constructive algorithms, dp, hashing, implementation, strings

Quadratic Set

constructive algorithms, hashing, math, number theory

Two Sequences

data structures, hashing, string suffix structures

AmShZ Wins a Bet

data structures, greedy, hashing

Alphabetic Tree

binary search, data structures, dfs and similar, hashing, string suffix structures, strings, trees

Mars

hashing

The Sum of Good Numbers

hashing, math, string suffix structures, strings

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Palindromic Hamiltonian Path

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

Playoff Restoration

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

Common Divisor Graph

brute force, constructive algorithms, dsu, graphs, hashing, math, number theory

Reverse String

brute force, dp, hashing, implementation, strings

Funny Substrings

data structures, hashing, implementation, matrices, strings

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers