Elimination of Players

combinatorics, dp, math

Good Substrings

combinatorics, data structures, data structures, dp, greedy, greedy, strings

Caveman

combinatorics, graphs

A Problem to Warm Up the Eyebrows

combinatorics, combinatorics, dp, dp, math, math

Clean Substrings

combinatorics, data structures, math

A Prime Flood (Hard Version)

brute force, combinatorics, combinatorics, combinatorics, dp, dp, number theory, number theory

A Prime Flood (Easy Version)

combinatorics, dp, number theory

Madamant's Skating Dynasty

combinatorics, math, sortings

Paired Bracket Sequences

combinatorics, math

Traveling the World

combinatorics, constructive algorithms, graphs, greedy, math

Sortable Permutations

brute force, combinatorics, math, number theory

A Ribbon for Tomorrow

combinatorics, math

Generational Triplets

bitmasks, combinatorics, dp, math

Permutation Cuts

combinatorics, implementation, math

0mar and Alternating Sums

combinatorics, dp, math

Familiar?

brute force, combinatorics, dp

Fair and Square

combinatorics, dp, graphs, math, number theory, trees

AI Finds Nothing Here

combinatorics, math

Hunting the Beast

combinatorics, dp, graphs, math

Infinite Work

combinatorics, graphs, greedy, math, trees

Elections in Saransk (hard version)

combinatorics, dp, dp, dp, math, number theory

Vlad, Misha and Two Arrays

brute force, combinatorics, dfs and similar, divide and conquer, math

Permutation Transmission (Difficult Version)

bitmasks, combinatorics, sortings

Permutation Transmission (Easy Version)

bitmasks, combinatorics, sortings

Snaking Arrangement

combinatorics, combinatorics, combinatorics, constructive algorithms

Wowee Binary String

combinatorics, dp, strings

Deconstruction Tree

combinatorics, data structures, dp, graphs, trees

Amanojaku and Sequence (Hard Version)

combinatorics, data structures, implementation, math

Amanojaku and Sequence (Easy Version)

combinatorics, math

Counting Sort?

brute force, combinatorics, dp

Down the Pivot

combinatorics, dp, math, trees

Interval Game

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

Learning Binary Search

combinatorics, divide and conquer, dp, math

AND-array

bitmasks, combinatorics, math

Counting Cute Arrays

combinatorics, dp

N-MEX (Counting Version)

combinatorics, constructive algorithms, math

Growth Factor

combinatorics, dp, math, number theory

Simons and Dividing the Rhythm

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

Sum of Fractions

binary search, brute force, combinatorics, data structures, greedy, math, number theory, two pointers

Rigged Bracket Sequence

combinatorics, dp, greedy

Operation Permutation

combinatorics, dp, math, probabilities

Sum of MEX

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

Self-Produced Sequences

*special problem, combinatorics, math

Interactive Graph (Hard Version)

combinatorics, dfs and similar, dp, graphs, interactive

Interactive Graph (Simple Version)

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

Median Permutation

combinatorics

Prufer Vertex

combinatorics, dsu, number theory, probabilities, trees

Sub-RBS (Easy Version)

combinatorics, constructive algorithms, dp, greedy, strings, two pointers

Little String (Hard Version)

combinatorics, dp, greedy, math, number theory

Little String (Easy Version)

combinatorics, dp, greedy, math, number theory

Exquisite Array

combinatorics, data structures, dsu, sortings

Unfair Game

combinatorics, dp, math

Jumping Man

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

Tree Coloring (Hard Version)

combinatorics, constructive algorithms, data structures, dfs and similar, greedy, implementation, trees

Short Garland

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

Christmas Reindeer (hard version)

bitmasks, brute force, combinatorics, data structures, greedy, math

Christmas Reindeer (easy version)

bitmasks, brute force, combinatorics, dp, math

Christmas Tree Decoration

combinatorics, dp, greedy, math

Production of Snowmen

brute force, combinatorics, dp

Balance

bitmasks, combinatorics, implementation, math

Control Car (Hard Version)

combinatorics, dp, matrices, probabilities

Control Car (Easy Version)

combinatorics, dp, probabilities

Numbers or Fireworks

bitmasks, combinatorics, dp, graphs

Conquer or of Forest

combinatorics, math, trees

Omega Numbers

bitmasks, combinatorics, dp, math, number theory

Mosaic Tree

combinatorics, dp, fft, math, trees

Beautiful Patterns (Hard Version)

combinatorics, math, probabilities

Beautiful Patterns (Easy Version)

combinatorics, math, probabilities

Divisor Card Game

combinatorics, dp

Sakura Adachi and Optimal Sequences

bitmasks, combinatorics, greedy, math

Binary Strings and Blocks

combinatorics, data structures, dp

Subsequence Problem

combinatorics, dp, fft, math

Locate

binary search, combinatorics, communication, constructive algorithms, greedy, interactive

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

Plegma

bitmasks, combinatorics, communication, interactive

Monopati

brute force, combinatorics, dp, math, two pointers

SubMST

combinatorics, graphs, trees

Left is Always Right

combinatorics, implementation, math

Twin Polynomials

combinatorics, graph matchings, math

Distinct GCDs (Hard Version)

combinatorics, constructive algorithms, graphs, math, number theory, number theory

Keygen 3

brute force, combinatorics, constructive algorithms, dfs and similar, math

Bombing (Hard Version)

combinatorics, dp

Bombing (Easy Version)

brute force, combinatorics, constructive algorithms, implementation, math

Counting Is Fun: The Finale

combinatorics, implementation

Attraction Theory

combinatorics, dp, math

Grid Counting

combinatorics, implementation, math

Modular Tetration

combinatorics, math, number theory

Exchange Queries

combinatorics, data structures, greedy

Bubble Sort

brute force, combinatorics, dp

Cost of Coloring

combinatorics, divide and conquer, dp, fft, math

Looking at Towers (difficult version)

combinatorics, data structures, dp

Looking at Towers (easy version)

combinatorics, dp

Non-Descending Arrays

combinatorics, 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

Prime Gaming (Hard Version)

bitmasks, combinatorics, dp, probabilities

Prime Gaming (Easy Version)

bitmasks, combinatorics, dp

Antiamuny and Slider Movement

brute force, combinatorics, implementation, math, sortings

Prefix Maximum Invariance

binary search, combinatorics, data structures, sortings