Knowledge Cards

constructive algorithms, data structures

Keyboard Design

bitmasks, data structures, dp, string suffix structures, strings

Reset K Edges

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

Palindrome Addicts

data structures, strings

Permutation Addicts

constructive algorithms, data structures, dfs and similar, dsu, graphs, trees

Ela Takes Dancing Class

binary search, data structures

Good Subarrays (Hard Version)

binary search, data structures, dp, two pointers

Good Subarrays (Easy Version)

binary search, data structures, schedules, two pointers

Pebbles and Beads

data structures, geometry

House Planning

constructive algorithms, data structures, graph matchings, greedy

Meta-set

brute force, combinatorics, data structures, hashing, math

Slime Escape

data structures, dp, greedy, two pointers

Location

data structures, dp, math, number theory

Balance (Hard version)

brute force, data structures, number theory

Balance (Easy version)

brute force, data structures, implementation, number theory

Valiant's New Map

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

Almost Sorted

bitmasks, data structures, dp

Maximums and Minimums

combinatorics, data structures, divide and conquer, number theory

Minimum Notation

data structures, greedy, math, sortings

Planets

data structures, greedy, sortings

Red-Black Pepper

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

Digital Logarithm

data structures, greedy, sortings

A Certain Magical Party

combinatorics, data structures, greedy, sortings

Late For Work (submissions are not allowed)

data structures, greedy, schedules, shortest paths

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

Lemper Cooking Competition

data structures

Kingdom of Criticism

data structures, dsu

Field Photography

bitmasks, data structures, sortings

Electrical Efficiency

combinatorics, data structures, dp, math, number theory, trees

Counting Rectangles

brute force, data structures, dp, implementation

Word Game

data structures, implementation

Misha and Paintings

constructive algorithms, data structures, greedy, implementation, math

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Interesting Sum

brute force, data structures, greedy, math, sortings

Fighting Tournament

binary search, data structures, implementation, two pointers

Burenka, an Array and Queries

data structures, math, number theory

Permutation for Burenka

data structures, graph matchings, greedy, math, trees

Tonya and Burenka-179

data structures, greedy, math, number theory

Burenka and Traditions (hard version)

data structures, dp, greedy

Swap and Maximum Block

bitmasks, data structures, dfs and similar, divide and conquer, dp

Robot in a Hallway

data structures, dp, greedy, implementation, ternary search

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths

Monoblock

combinatorics, data structures, implementation, math

Path Prefixes

binary search, data structures, dfs and similar, trees

Color with Occurrences

brute force, data structures, dp, greedy, strings

Remove Prefix

data structures, greedy, implementation

Cross Swapping

2-sat, data structures, dsu, greedy, matrices

Triameter

binary search, data structures, dfs and similar, trees

LCM Sum (hard version)

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

Empty Graph

binary search, constructive algorithms, data structures, greedy, shortest paths

Rain

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

XOR Tree

bitmasks, data structures, dfs and similar, dsu, greedy, trees

Rorororobot

binary search, data structures, greedy, math

Also Try Minecraft

data structures, dp, implementation

Replace

binary search, data structures

Difference Array

brute force, data structures, implementation, sortings

Qpwoeirut and Vertices

binary search, data structures, dfs and similar, divide and conquer, dsu, greedy, trees

Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

Mark and Professor Koro

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

Yet Another Problem About Pairs Satisfying an Inequality

binary search, data structures, dp, greedy, sortings

Double Strings

brute force, data structures, strings

ICPC Balloons

data structures, implementation

Passable Paths (hard version)

data structures, dfs and similar, trees

Equate Multisets

constructive algorithms, data structures, greedy, math, number theory

Train and Queries

data structures, greedy

Points

combinatorics, data structures, implementation, math, matrices

Permutation Restoration

binary search, data structures, greedy, math, sortings, two pointers

Helping the Nature

constructive algorithms, data structures, greedy

Three Days Grace

data structures, dp, greedy, math, number theory, two pointers

Almost Triple Deletions

data structures, dp, greedy

3SUM Closure

brute force, data structures

awoo's Favorite Problem

binary search, constructive algorithms, data structures, greedy, implementation, strings, two pointers

Fishingprince Plays With Array Again

brute force, data structures, geometry, math

Permutation Graph

binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths

Zero Path

brute force, data structures, dp, graphs, greedy, shortest paths

Outermost Maximums

data structures, greedy

Decinc Dividing

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

Gambling

data structures, dp, greedy, math

2^Sort

data structures, dp, sortings, two pointers

Number of Groups

data structures, dfs and similar, dsu, graphs, greedy, sortings

Max GEQ Sum

binary search, constructive algorithms, data structures, divide and conquer, implementation, two pointers

Count the Trains

binary search, data structures, greedy, sortings

Restoring the Duration of Tasks

data structures, greedy, implementation

Lena and Matrix

data structures, dp, geometry, shortest paths

Mystic Permutation

data structures, greedy

Cute number

binary search, brute force, data structures, dsu, implementation, math

Sanae and Giant Robot

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

The Ultimate LIS Problem

data structures, greedy

Diverse Segments

data structures, two pointers

MEX vs DIFF

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

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

Unique Occurrences

data structures, dfs and similar, divide and conquer, dp, dsu, trees

Labyrinth Adventures

data structures, dp, matrices, shortest paths

Rooks Defenders

data structures, implementation

Stone Age Problem

data structures, implementation

Tokitsukaze and Beautiful Subsegments

data structures

Tokitsukaze and Meeting

data structures, implementation, math

Tokitsukaze and Strange Inequality

brute force, data structures, dp

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Longest Strike

data structures, greedy, implementation, sortings, two pointers