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

Desktop Rearrangement

data structures, greedy, implementation

PermutationForces

data structures, greedy

Zigu Zagu

constructive algorithms, data structures, greedy

Where is the Pizza?

data structures, dfs and similar, dsu, graphs, implementation, math

Eating Candies

binary search, data structures, greedy, two pointers

2-Letter Strings

data structures, math, strings

Optimal Partition

data structures, dp

MinimizOR

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

Il Derby della Madonnina

data structures, dp, math

Antennas

data structures, dfs and similar, graphs, graphs, implementation, implementation, shortest paths, shortest paths

Narrow Components

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

Progressions Covering

data structures, greedy

Promising String (hard version)

data structures, implementation, math, strings

Reverse Sort Sum

constructive algorithms, data structures, greedy, implementation, math, two pointers

Gojou and Matrix Game

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

388535 (Hard Version)

bitmasks, brute force, data structures, math

Equal LCM Subsets

data structures, math, number theory

Subtract Operation

data structures, greedy, math, two pointers

Snowy Mountain

data structures, dfs and similar, graphs, greedy, shortest paths, trees

Minimal String Xoration

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

Arithmetic Operations

brute force, data structures, graphs, math

Alice and the Cake

data structures, greedy, implementation, sortings

Tower Defense

binary search, brute force, data structures

Nearest Excluded Points

binary search, data structures, dfs and similar, graphs, shortest paths

Fault-tolerant Network

brute force, data structures, implementation

Counting Shortcuts

data structures, dfs and similar, dp, graphs, shortest paths

Rescheduling the Exam

binary search, data structures, greedy, implementation, math, sortings

Two Avenues

data structures, dfs and similar, graphs

Air Reform

data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees

Serious Business

data structures, divide and conquer, dp, implementation, shortest paths

Tyler and Strings

combinatorics, data structures, implementation

Integral Array

brute force, constructive algorithms, data structures, math

Weird Sum

combinatorics, data structures, geometry, math, matrices, sortings

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Expand the Path

brute force, combinatorics, data structures, implementation, math

Cross Coloring

data structures, implementation, math

Anonymity Is Important

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

Two Posters

brute force, data structures, greedy, two pointers

Colorful Operations

brute force, data structures, implementation

Big Brush

constructive algorithms, data structures, greedy, implementation