Unique Values (Hard version)

binary search, bitmasks, constructive algorithms, interactive

Unique Values (Easy version)

binary search, constructive algorithms, divide and conquer, interactive, math

Grid L

brute force, constructive algorithms, math, number theory

The 67th Iteration of "Counting is Fun"

implementation, math

The 67th Tree Problem

constructive algorithms, implementation, trees

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

Definitely Larger

binary search, constructive algorithms, data structures, graphs, greedy, sortings

Flip the Bit (Hard Version)

greedy, implementation, math

Maze

trees

Research

games

Star Map

constructive algorithms, data structures, geometry, greedy, sortings

EXPloration, EXPloitation, and Gain Some EXPerience!

bitmasks, brute force, dp, greedy, implementation

Oriented Journey

bitmasks, brute force, communication, constructive algorithms, graphs, interactive, trees

RReeppeettiittiioonn

binary search, brute force, implementation, math, number theory

Interval Mod

constructive algorithms, dp, greedy, math

Median Deletion

Rational Bubble Sort

constructive algorithms, geometry, greedy

Learning Binary Search

combinatorics, divide and conquer, dp, math

Minimum Path Cover

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

AND-array

bitmasks, combinatorics, math

Equal Multisets (Hard Version)

constructive algorithms, dsu, greedy

A Simple Problem

binary search, data structures, greedy, math, trees

Binary Strings are Simple?

constructive algorithms, implementation, interactive, number theory

A Simple RBS Problem

constructive algorithms, math, strings, trees

A Simple GCD Problem (Hard Version)

dp, greedy, number theory

Dynamic Values And Maximum Sum

data structures, data structures, greedy, implementation, trees

A Trivial String Problem

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

Ghostfires

constructive algorithms, greedy

Find the Zero

constructive algorithms, interactive

Counting Cute Arrays

combinatorics, dp

Tree Orientation (Hard Version)

dfs and similar, dsu, graphs, greedy, sortings, trees

Tree Orientation (Easy Version)

constructive algorithms, dfs and similar, dsu, graphs, greedy, matrices, trees

Bowser's Castle (Hard Version)

constructive algorithms, divide and conquer, interactive, trees, two pointers

Bowser's Castle (Medium Version)

constructive algorithms, divide and conquer, interactive, trees, two pointers

Bowser's Castle (Easy Version)

binary search, constructive algorithms, divide and conquer, greedy, interactive, trees

Toothless

constructive algorithms, dfs and similar, dsu

Hanabi

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

N-MEX (Counting Version)

combinatorics, constructive algorithms, math

N-MEX (Constructive Version)

constructive algorithms, greedy

Boxed Like a Fish

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

Where's My Water?

data structures, divide and conquer, dp, math

One Night At Freddy's

games, greedy, sortings

Deformed Balance

Onion

Worldwide Playlist

math

Growth Factor

combinatorics, dp, math, number theory

Reflect Sort

number theory

Extra Transition

graphs

Minesweeper String

fft, number theory

Parallel Sums

data structures, geometry

Christmas Tree Un-decoration

data structures, dp, trees

Upside Down Dijkstra

dfs and similar

Subtree Removal Game

binary search, games, trees

Compare Suffixes

interactive

Simons and Diophantus Equation

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

Simons and Reconstructing His Roads

constructive algorithms, constructive algorithms, constructive algorithms, constructive algorithms, data structures, data structures, dsu, graphs

Simons and Dividing the Rhythm

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

Simons and Beating Peaks

data structures, data structures, divide and conquer, dp, dp, greedy, implementation, trees

Simons and Posting Blogs

greedy, greedy, greedy, sortings

Grid Path

dp, dp, graphs, matrices

Sum of Fractions

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

Sum of Digits (and Again)

brute force, constructive algorithms, math

Alternating Path

constructive algorithms, dfs and similar, graph matchings, graphs, graphs, graphs, graphs

Binary Search with One Swap

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

Probabilistic Card Game

binary search, data structures, games, greedy, math, ternary search

Divisibility Game

brute force, games, games, games, greedy, number theory, number theory

Test Generator

binary search, bitmasks, greedy, math

Monotone Monochrome Matrices (Easy Version)

data structures, data structures, data structures, data structures

Codeforces Heuristic Contest 1001

constructive algorithms

Monotone Monochrome Matrices (Hard Version)

constructive algorithms, data structures, hashing, math

Monotone Monochrome Matrices (Medium Version)

data structures, hashing

ABBA Counting

fft, fft, math, number theory, strings

Binary Not Search and Queries

data structures, greedy, implementation

Rigged Bracket Sequence

combinatorics, dp, greedy

Recollect Numbers

constructive algorithms

Lost Civilization (Hard Version)

data structures, dp

Six Seven

divide and conquer, math, number theory, strings, strings, trees

Operation Permutation

combinatorics, dp, math, probabilities

Mooclear Reactor 2

brute force, data structures, greedy, implementation, sortings

Divisive Battle

games, greedy, math, number theory

Strange Process

*special problem

Sum of MEX

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

Jammer

*special problem, math

Self-Produced Sequences

*special problem, combinatorics, math

Supersequence

*special problem, binary search, greedy

Two Arrays

*special problem, math

Minesweeper

*special problem, constructive algorithms, greedy

Two Towers

*special problem, greedy, math

Indivisible

brute force, constructive algorithms, graphs

Fuzzy Concatenation (Hard version)

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

Fuzzy Concatenation (Easy Version)

binary search, bitmasks, brute force, data structures, 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

Another Problem about Beautiful Pairs

brute force, math, two pointers

Codeforces Heuristic Contest 001

brute force, constructive algorithms, geometry, implementation

Idiot First Search and Queries

binary search, data structures, dp, graphs, trees

Parabola Independence

dp, graphs, greedy, math, sortings