Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Access Levels

bitmasks, dsu, flows, graph matchings

Delicious Dessert

binary search, dsu, hashing, math, number theory, string suffix structures

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Trails and Glades

constructive algorithms, dsu, graphs, greedy

Deduction Queries

data structures, dsu

Vasya and Maximum Profit

binary search, constructive algorithms, data structures, dp, dsu

Three strings

data structures, dsu, string suffix structures, strings

Labyrinth

binary search, dsu, greedy

Acyclic Organic Compounds

data structures, dfs and similar, dsu, hashing, strings, trees

Bear and Square Grid

dfs and similar, dsu, implementation

Connectivity Addicts

constructive algorithms, dsu, graphs, greedy, interactive, shortest paths, trees

Leaf Sets

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

Forbidden Indices

dsu, string suffix structures, strings

Koxia and Tree

combinatorics, dfs and similar, dp, dsu, math, probabilities, trees

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

DFS Trees

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

Plan of Lectures

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

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Session in BSU

binary search, dfs and similar, dsu, graph matchings, graphs

Cross Swapping

2-sat, data structures, dsu, greedy, matrices

Prefix Enlightenment

dfs and similar, dsu, graphs

Great Grids

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

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Avoid Rainbow Cycles

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

Mr. Kitayuta's Colorful Graph

brute force, dfs and similar, dsu, graphs

Imbalance Value of a Tree

data structures, dsu, graphs, trees

XOR Tree

bitmasks, data structures, dfs and similar, dsu, greedy, trees

Hercule Poirot Problem

dsu, graphs

Dima and Kicks

brute force, dsu, graphs, implementation

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Clearing Up

constructive algorithms, dp, dsu, graphs

Beautiful Road

dfs and similar, dp, dsu, graphs, implementation, sortings, trees

Ski Base

combinatorics, dsu, graphs

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

Interestring graph and Apples

dfs and similar, dsu, graphs

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

City Union

constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math

Li Hua and Array

brute force, data structures, dsu, math, number theory, two pointers

Columns Swaps

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

New Year Domino

data structures, dp, dsu

st-Spanning Tree

dsu, graphs, greedy, implementation

Infinite Card Game

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

Max to the Right of Min

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

Unique Occurrences

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

Number of Groups

data structures, dfs and similar, dsu, graphs, greedy, sortings

Merging Towers

data structures, dsu, implementation, trees

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Envy

data structures, dsu, graphs

Edges in MST

dfs and similar, dsu, graphs, sortings

Qpwoeirut and Vertices

binary search, data structures, dfs and similar, divide and conquer, dsu, greedy, trees

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

Dominant Indices

data structures, dsu, trees

Lomsat gelral

data structures, dfs and similar, dsu, trees

School

dp, dsu

Leaders

dfs and similar, dsu, graphs, trees

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Network Safety

dfs and similar, dsu, graphs, math, sortings

Gift

dsu, graphs, sortings, trees

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Trader Problem

data structures, dsu, greedy, sortings

Chain Reaction

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

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Love Triangles

dfs and similar, dsu, graphs

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Robots on a Grid

data structures, dfs and similar, dsu, graphs, greedy, matrices

Cars

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

Anonymity Is Important

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

Figure Fixing

constructive algorithms, dfs and similar, dsu, graphs, greedy, math

Ring Road 2

2-sat, dfs and similar, dsu, graphs

Tourism

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

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

0-1-Tree

dfs and similar, divide and conquer, dp, dsu, trees

Fools and Foolproof Roads

data structures, dfs and similar, dsu, graphs, greedy

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Valera and Swaps

constructive algorithms, dsu, graphs, implementation, math, string suffix structures

Petya and Spiders

bitmasks, dp, dsu

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

Counter Attack

data structures, dsu, graphs, hashing, sortings

Beard Graph

data structures, dsu, trees

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Information Graph

dfs and similar, dsu, graphs, trees

Weird journey

combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

MST Unification

binary search, dsu, graphs, greedy

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Euclid's nightmare

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

Monsters

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

Permutation Shift

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

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees

Segment Tree

data structures, dsu, graphs, trees

Civilization

dfs and similar, dp, dsu, ternary search, trees

Connected Components?

data structures, dfs and similar, dsu, graphs