Tensor

constructive algorithms, graphs, interactive

Cat, Fox and Swaps

graphs, math, sortings

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Min-Fund Prison (Medium)

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

Balanced Unshuffle (Hard)

constructive algorithms, trees

Balanced Unshuffle (Medium)

brute force, constructive algorithms, trees

Long Way to be Non-decreasing

binary search, dfs and similar, graphs, implementation, shortest paths, two pointers

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, trees

Conference

data structures, flows

Equal Trees

*special problem, graphs, meet-in-the-middle

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

Frequency Mismatch (Easy Version)

binary search, data structures, divide and conquer, hashing, probabilities, trees

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

Chain Reaction

binary search, data structures, dsu, greedy, implementation, math, number theory

Growing Trees

binary search, constructive algorithms, flows, graphs, greedy

Thanos Snap

binary search, dp, games, greedy, trees

Amanda the Amoeba

graphs, implementation, trees, two pointers

Scooter

graphs, greedy

Dating

greedy, sortings, trees

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Nobody is needed

2-sat, data structures, dfs and similar, dp

Tree Compass

constructive algorithms, dfs and similar, greedy, trees

Farmer John's Favorite Intern

data structures, dp, flows, trees

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Andrey's Tree

binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees

Moving Platforms

graphs, math, number theory, shortest paths

Interactive Mex Tree

constructive algorithms, dfs and similar, interactive, trees

Prefix Max Set Counting

data structures, dp, trees

Sasha and the Wedding Binary Search Tree

brute force, combinatorics, data structures, dfs and similar, math, trees

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Modular Sequence

brute force, constructive algorithms, dp, graphs, greedy, math, number theory

Replace on Segment

dp, graph matchings

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Tree LGM

constructive algorithms, divide and conquer, games, trees

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Caterpillar on a Tree

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

Construct Tree

bitmasks, constructive algorithms, dp, trees

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Group Division

constructive algorithms, dfs and similar, graphs, greedy

Happy Life in University

data structures, dfs and similar, greedy, trees

Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Matrix Problem

flows, graphs

Hypercatapult Commute

graphs

Lights

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Contingency Plan 2

graph matchings

One-X

combinatorics, dfs and similar, dp, math, trees

Beautiful Tree

data structures, dfs and similar, graphs, implementation, trees

Tree Queries

data structures, dfs and similar, graphs, implementation, trees

Babysitting

2-sat, binary search, data structures, graphs, trees

Trees and XOR Queries Again

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

Compressed Tree

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

Vova Escapes the Matrix

brute force, dfs and similar, divide and conquer, shortest paths

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

Infinite Card Game

binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Doremy's Average Tree

data structures, dp, greedy, trees

Doremy's Swapping Trees

dfs and similar, graphs, trees

Game of Stacks

brute force, dfs and similar, graphs, implementation, trees

Good Colorings

binary search, constructive algorithms, graphs, interactive

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers

Interactive Game with Coloring

brute force, constructive algorithms, dfs and similar, graphs, implementation, interactive, trees

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Clubstep

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

Indefinite Clownfish

binary search, graphs

Ball-Stackable

constructive algorithms, data structures, dp, trees

Lexichromatography

combinatorics, dfs and similar, dsu, graphs, two pointers

Jellyfish and EVA

dp, graphs, greedy, math, probabilities

Jellyfish and Math

bitmasks, brute force, dfs and similar, dp, graphs, shortest paths

Standard Graph Problem

data structures, graphs, greedy, trees

Another MEX Problem

bitmasks, brute force, dp, shortest paths

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Travel Plan

combinatorics, dp, implementation, math, trees

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

Future Dominators

graphs, greedy

Redundant Routes

constructive algorithms, dp, trees

Goldberg Machine 3

dp, trees

Swaps

combinatorics, dp, graphs, math

Four Suits

binary search, bitmasks, flows, greedy

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Teleportation in Byteland

data structures, dfs and similar, divide and conquer, graphs, shortest paths, trees

Rollbacks (Hard Version)

data structures, interactive, trees

Rollbacks (Easy Version)

brute force, data structures, dfs and similar, trees

PermuTree (hard version)

bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees

Michael and Hotel

binary search, interactive, trees

Panda Meetups

data structures, dp, flows

XOR Partition

binary search, bitmasks, data structures, divide and conquer, greedy, trees

Max to the Right of Min

binary search, data structures, divide and conquer, dp, dsu, two pointers

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Great Grids

2-sat, constructive algorithms, dfs and similar, dsu, graphs

Omsk Metro (hard version)

data structures, dfs and similar, divide and conquer, dp, math, trees

Tenzing and Random Real Numbers

bitmasks, dp, graphs, math, probabilities

Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

Railguns

brute force, dfs and similar, dp, graphs

Playoff Fixing

combinatorics, trees

Good Graph

bitmasks, dfs and similar, graph matchings, graphs, implementation

Doctor's Brown Hypothesis

dfs and similar, graphs, math, number theory

Mex Tree

brute force, dp, trees