Closer

dfs and similar, dp, trees

Down the Pivot

combinatorics, dp, math, trees

Interval Game

bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities

EXPloration, EXPloitation, and Gain Some EXPerience!

bitmasks, brute force, dp, greedy, implementation

Learning Binary Search

combinatorics, divide and conquer, dp, math

Minimum Path Cover

brute force, dp, greedy, interactive, interactive, math, number theory, trees

A Simple GCD Problem (Hard Version)

dp, greedy, number theory

A Trivial String Problem

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

Counting Cute Arrays

combinatorics, dp

Hanabi

binary search, data structures, dp, dsu, flows, graph matchings, graphs, greedy

Boxed Like a Fish

dfs and similar, dp, games, shortest paths, trees

Growth Factor

combinatorics, dp, math, number theory

Christmas Tree Un-decoration

data structures, dp, trees

Simons and Dividing the Rhythm

combinatorics, data structures, dp, dsu, math, string suffix structures, strings, strings, strings

Grid Path

dp, dp, graphs, matrices

Binary Search with One Swap

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

Rigged Bracket Sequence

combinatorics, dp, greedy

Operation Permutation

combinatorics, dp, math, probabilities

Sum of MEX

*special problem, combinatorics, data structures, dp, math

Fuzzy Concatenation (Hard version)

binary search, bitmasks, data structures, dp, greedy, string suffix structures

Double Bracket Sequence

data structures, dp, expression parsing, flows, greedy, strings

Interactive Graph (Hard Version)

combinatorics, dfs and similar, dp, graphs, interactive

Interactive Graph (Simple Version)

binary search, combinatorics, dfs and similar, dp, graphs, interactive

Idiot First Search and Queries

binary search, data structures, dp, graphs, trees

Parabola Independence

dp, graphs, greedy, math, sortings

Again Trees... (hard version)

bitmasks, data structures, dfs and similar, dp, fft, trees

Again Trees... (Easy Version)

bitmasks, dfs and similar, dp, trees

The Turtle Strikes Back

dp, graphs, greedy, implementation

Remove the Grail Tree

dfs and similar, dp, graphs, greedy, implementation, trees

Fish Fight

dp, dp, math, probabilities, probabilities

Cost of Tree

dp, greedy, trees, trees

Xor Product

bitmasks, dp

Sub-RBS (Hard Version)

dp, games, implementation, strings

Zhora the Vacuum Cleaner

data structures, dfs and similar, dp, greedy, implementation, sortings, trees

Little String (Hard Version)

combinatorics, dp, greedy, math, number theory

Little String (Easy Version)

combinatorics, dp, greedy, math, number theory

Al Fine (Counting Version)

dp, trees

Doors and Keys

brute force, data structures, dp

Cool Problem

bitmasks, dp, math

Shortest Statement Ever

bitmasks, constructive algorithms, dp, greedy

BattleCows 2

binary search, brute force, data structures, dp, greedy

Cherry Tree

dfs and similar, dp, graphs, trees

Minimise Cost

binary search, dp, greedy, sortings

Jumping Man

brute force, combinatorics, dfs and similar, dp, trees

LCM is Legendary Counting Master

dp, math, number theory

Short Garland

combinatorics, data structures, dfs and similar, dp, trees

Christmas Reindeer (easy version)

bitmasks, brute force, combinatorics, dp, math

Jinx or Jackpot

brute force, dp, math, probabilities

Greta's Game

binary search, dp, graphs, greedy, math

Control Car (Hard Version)

combinatorics, dp, matrices, probabilities

Control Car (Easy Version)

combinatorics, dp, probabilities

No Effect XOR

bitmasks, divide and conquer, dp, greedy, math

Insolvable Disks

data structures, dp, greedy, math

XOR-factorization

bitmasks, constructive algorithms, dp, greedy, number theory

Blackslex and Plants

bitmasks, data structures, dp, implementation, math

Numbers or Fireworks

bitmasks, combinatorics, dp, graphs

deCH OR Dations

bitmasks, data structures, dp, hashing, probabilities

Omega Numbers

bitmasks, combinatorics, dp, math, number theory

Remove at the lowest cost

data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Fibonacci Paths

data structures, dp, graphs, sortings

Mosaic Tree

combinatorics, dp, fft, math, trees

Secret Message

data structures, dp, greedy, trees

Wishing Cards

dp

Taiga's Carry Chains

bitmasks, brute force, dp, greedy, math

Maximum Color Segment

dp, implementation

Divisor Card Game

combinatorics, dp

Shiori Miyagi and Maximum Array Score

binary search, data structures, dp, sortings

Build XOR on a Segment

bitmasks, dp

Binary Strings and Blocks

combinatorics, data structures, dp

Subsequence Problem

combinatorics, dp, fft, math

Points Selection

dp, greedy

Rainbow Branch

constructive algorithms, dp, greedy, trees

Marble Council

dp, math, sortings

Chain Prefix Rank (Hard Version)

binary search, combinatorics, data structures, dfs and similar, dp, graphs, math, trees

Chain Prefix Rank (Easy Version)

combinatorics, dfs and similar, dp, math, trees

Beautiful Problem

dp

Locked Out

binary search, data structures, dp, greedy

Inverse Minimum Partition (Hard Version)

dp, greedy, math

Inverse Minimum Partition (Easy Version)

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

Rectangles

brute force, data structures, dp, dsu, greedy, implementation, two pointers

Hyper Smawk Bros

dp, dp, games

Isaac's Queries

bitmasks, brute force, constructive algorithms, dfs and similar, divide and conquer, dp, greedy, interactive, math, probabilities

Adjusting Drones

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

Best Time to Buy and Sell Stock

binary search, brute force, data structures, dp, games, graphs, greedy

Bombing (Hard Version)

combinatorics, dp

Not Alone

dp, greedy

Victorious Coloring (Easy Version)

dfs and similar, dp, greedy

Attraction Theory

combinatorics, dp, math

Limited Edition Shop

data structures, dp

Bubble Sort

brute force, combinatorics, dp

Cost of Coloring

combinatorics, divide and conquer, dp, fft, math

Long Journey

dfs and similar, divide and conquer, dp, graphs, greedy, math, matrices, number theory

Inversion Value of a Permutation

constructive algorithms, dfs and similar, dp

Bracket Groups

brute force, constructive algorithms, dp, string suffix structures, strings

Looking at Towers (difficult version)

combinatorics, data structures, dp

Looking at Towers (easy version)

combinatorics, dp

Price Tags

brute force, dp, math

Inversion Graph Coloring (Hard Version)

binary search, combinatorics, data structures, dp, two pointers

Inversion Graph Coloring (Easy Version)

combinatorics, data structures, dp, greedy, two pointers

Perfect Cut

*special problem, dp, greedy