Button Lock

flows, graph matchings, graphs

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Balance the Cards

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation

Graph Coloring

data structures, graphs, interactive

Two Houses

brute force, graphs, greedy, interactive, sortings

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Genius

bitmasks, dp, graphs, number theory

Squares

constructive algorithms, data structures, dp, graphs, trees

BFS Trees

combinatorics, dfs and similar, graphs, math, shortest paths, trees

Garden of the Sun

constructive algorithms, graphs

Delete The Edges

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

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Switch and Flip

constructive algorithms, graphs, math

Cheap Dinner

brute force, data structures, graphs, greedy, implementation, sortings, two pointers

Minimum Ties

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

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Useful Edges

graphs, shortest paths

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Nezzar and Hidden Permutations

constructive algorithms, dfs and similar, graphs

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Longest Simple Cycle

dp, graphs, greedy

Ball in Berland

combinatorics, graphs, math

Minimum Path

graphs, shortest paths

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

Long Jumps

dp, graphs

Strange Permutation

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

Strange Housing

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

Strange Definition

bitmasks, graphs, hashing, math, number theory

Similar Sets

data structures, graphs, implementation

Road Reform

dsu, graphs, greedy

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Plan of Lectures

constructive algorithms, dfs and similar, dsu, graphs, implementation, sortings, trees

Water Level

brute force, graphs, greedy, implementation, math

Flip and Reverse

data structures, graphs, greedy

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Capitalism

constructive algorithms, dfs and similar, graphs, shortest paths

Team-Building

data structures, dfs and similar, dsu, graphs

Graph Transpositions

dfs and similar, graphs, greedy, shortest paths

Graph Subset Problem

constructive algorithms, data structures, graphs

Binary Table (Hard Version)

constructive algorithms, graphs, greedy, implementation

Minimal Height Tree

graphs, greedy, shortest paths, trees

Bandit in a City

binary search, dfs and similar, graphs, greedy, trees

Reducing Delivery Cost

brute force, graphs, shortest paths

Yet Another DAG Problem

bitmasks, dfs and similar, dp, flows, graphs, math

Belted Rooms

graphs, implementation

One Billion Shades of Grey

flows, graphs

Ancient Language

graphs, sortings

Virus

data structures, divide and conquer, dsu, graphs

Dušan's Railway

divide and conquer, graphs, trees

Valuable Paper

binary search, flows, graph matchings, graphs

Returning Home

graphs, shortest paths, sortings

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Mortal Kombat Tower

dp, graphs, greedy, shortest paths

Graph and Queries

data structures, dsu, graphs, implementation, trees

Peaceful Rooks

dfs and similar, dsu, graphs

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Discrete Centrifugal Jumps

data structures, dp, graphs

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Bricks

flows, graph matchings, graphs

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Yet Another Segments Subset

data structures, dp, graphs, sortings

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Kevin and Grid

fft, graphs, math

Pairs of Pairs

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

Cyclic Permutations

combinatorics, dp, graphs, math

Directing Edges

dfs and similar, dp, graphs, trees

Captain Flint and Treasure

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

Columns Swaps

2-sat, dfs and similar, dsu, graphs, implementation

Directing Edges

constructive algorithms, dfs and similar, graphs

Special Edges

flows, graphs

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

String Transformation 2

bitmasks, dp, graphs, trees

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

The Hidden Pair (Hard Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

The Hidden Pair (Easy Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

TediousLee

dp, graphs, greedy, math, trees

Shifting Dominoes

data structures, geometry, graphs, trees

Ski Accidents

constructive algorithms, graphs, greedy

Necklace Assembly

brute force, dfs and similar, dp, graphs, greedy, number theory

Jog Around The Graph

binary search, dp, geometry, graphs

Solve The Maze

constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, shortest paths

Ehab's Last Corollary

constructive algorithms, dfs and similar, graphs, greedy, implementation, trees

James and the Chase

dfs and similar, graphs, probabilities, trees

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

Johnny and Contribution

constructive algorithms, graphs, greedy, sortings

Polygon

dp, graphs, implementation, shortest paths

Graph Coloring

dfs and similar, dp, graphs

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Phoenix and Memory

data structures, dfs and similar, graphs, greedy

Magic Tricks

*special problem, dp, graphs

Constructing the Dungeon

*special problem, graphs, greedy

Quantifier Question

dfs and similar, dp, graphs, math