Count Seconds

brute force, constructive algorithms, dp, graphs, implementation, math

Magical Array

constructive algorithms, hashing, implementation, math

Virus

greedy, implementation, sortings

Luke is a Foodie

brute force, greedy, implementation

Two 0-1 Sequences

constructive algorithms, greedy

Good Key, Bad Key

bitmasks, brute force, dp, greedy, math

Yet Another Problem About Pairs Satisfying an Inequality

binary search, data structures, dp, greedy, sortings

Mirror Grid

implementation

Double Strings

brute force, data structures, strings

Cypher

brute force, implementation, strings

ICPC Balloons

data structures, implementation

YES or YES?

brute force, implementation, strings

Passable Paths (hard version)

data structures, dfs and similar, trees

Passable Paths (easy version)

dfs and similar, trees

Equate Multisets

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

Split Into Two Sets

dfs and similar, dsu, graphs

Not a Cheap String

greedy

Train and Queries

data structures, greedy

Polycarp Writes a String from Memory

greedy

Round Down the Price

constructive algorithms

Points

combinatorics, data structures, implementation, math, matrices

Text Editor

brute force, dp, greedy, strings

Permutation Restoration

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

Schedule Management

binary search, greedy, implementation, two pointers

Permutation

greedy

Grass Field

implementation

Puzzle

constructive algorithms, dp, greedy

Serega the Pirate

brute force, constructive algorithms

River Locks

binary search, dp, greedy, math

Helping the Nature

constructive algorithms, data structures, greedy

Palindromic Numbers

constructive algorithms, implementation, math

Optimal Path

constructive algorithms, greedy, math

Three Days Grace

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

Almost Triple Deletions

data structures, dp, greedy

The Third Problem

combinatorics, constructive algorithms, math

Almost Ternary Matrix

bitmasks, constructive algorithms, matrices

The Third Three Number Problem

constructive algorithms, math

Long Binary String

bitmasks, math, matrices, meet-in-the-middle, number theory

Equal Reversal

constructive algorithms, graphs, implementation, math

PermutationForces II

brute force, combinatorics, greedy, sortings, trees, two pointers

Fixed Point Guessing

binary search, constructive algorithms, interactive

3SUM Closure

brute force, data structures

Rising Sand

constructive algorithms, greedy, implementation

XOR Mixup

bitmasks, brute force

Too Many Constraints

2-sat, constructive algorithms, graphs, implementation

Coloring

brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math

Guess The String

binary search, constructive algorithms, interactive

awoo's Favorite Problem

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

Promo

greedy, sortings

Parkway Walk

greedy, implementation

Maximum Product?

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

Fishingprince Plays With Array Again

brute force, data structures, geometry, math

Tree Recovery

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

Placing Jinas

combinatorics, math

Permutation Graph

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

Fishingprince Plays With Array

constructive algorithms, greedy, implementation, math

NIT Destroys the Universe

greedy

NIT orz!

bitmasks, greedy

Ambiguous Dominoes

constructive algorithms, dfs and similar, graphs

Tree Queries (Hard Version)

constructive algorithms, dfs and similar, dp, greedy, trees

Tree Queries (Easy Version)

brute force, constructive algorithms, dfs and similar, dp, greedy, trees

Zero Path

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

Circle Game

games, greedy

Subrectangle Guess

games

Paranoid String

constructive algorithms, greedy

Creep

greedy, implementation

I Might Be Wrong

binary search, greedy, two pointers

Outermost Maximums

data structures, greedy

Decinc Dividing

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

Keshi in Search of AmShZ

graphs, greedy, shortest paths

Fake Plastic Trees

dfs and similar, dp, greedy, trees

Directional Increase

greedy

Gambling

data structures, dp, greedy, math

2^Sort

data structures, dp, sortings, two pointers

3SUM

brute force, math

Binary Deque

binary search, implementation, two pointers

The Clock

brute force, implementation

Where's the Bishop?

implementation

All Distinct

greedy, sortings

Marathon

implementation

K-Set Tree

combinatorics, dfs and similar, dp, math, trees

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

Sum of Substrings

brute force, constructive algorithms, greedy, math, strings

Shoe Shuffling

constructive algorithms, greedy, implementation, two pointers

Beat The Odds

brute force, greedy, math

Count the Trains

binary search, data structures, greedy, sortings

Shifting String

graphs, math, number theory, strings

Price Maximization

binary search, greedy, math, two pointers

Black and White Stripe

implementation, two pointers

Restoring the Duration of Tasks

data structures, greedy, implementation

Array Decrements

greedy, implementation

Print a Pedestal (Codeforces logo?)

constructive algorithms, greedy

ANDfinity

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

Lena and Matrix

data structures, dp, geometry, shortest paths

Infected Tree

dfs and similar, dp, trees

Mystic Permutation

data structures, greedy

Lex String

brute force, greedy, implementation, sortings, two pointers

Manipulating History

constructive algorithms, greedy, strings

Patchouli's Magical Talisman

bitmasks, constructive algorithms, greedy, sortings