Chemical table

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

Professor Higashikata

data structures, dsu, greedy, implementation, strings

Permutation Addicts

constructive algorithms, data structures, dfs and similar, dsu, graphs, trees

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

Lucky Tree

dp, dsu, trees

The Child and Zoo

dsu, sortings

Restructuring Company

data structures, dsu

Spanning Tree with One Fixed Degree

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

Exposition

binary search, data structures, dsu, trees, two pointers

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

The Road to Berland is Paved With Good Intentions

2-sat, dfs and similar, dsu, graphs

Connected Components

data structures, dfs and similar, dp, dsu

Shark

brute force, data structures, dsu, trees

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

SUM and REPLACE

brute force, data structures, dsu, number theory

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

The Door Problem

2-sat, dfs and similar, dsu, graphs

Counting Graphs

combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees

Two Sets

2-sat, dfs and similar, dsu, graph matchings, greedy

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Range Sorting (Easy Version)

binary search, dp, dsu, greedy, trees, two pointers

Edge Split

brute force, constructive algorithms, dfs and similar, dsu, graphs, probabilities, trees

Mahmoud and a Dictionary

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

Count Paths

data structures, dfs and similar, dp, dsu, graphs, trees

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Vlad and the Mountains

binary search, data structures, dsu, graphs, implementation, sortings, trees, two pointers

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Dima and Bacteria

dsu, graphs, shortest paths

Segments Removal

data structures, dsu, flows, implementation, two pointers

Unusual Minesweeper

binary search, dfs and similar, dsu, greedy, sortings

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

Weak Memory

dfs and similar, dsu

Dima and Trap Graph

binary search, data structures, dfs and similar, dsu, shortest paths, two pointers

Nanami's Digital Board

dsu, implementation

Building Forest

data structures, dsu, graphs

Minimum spanning tree for each edge

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

Connected Components?

data structures, dfs and similar, dsu, graphs

Civilization

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

Segment Tree

data structures, dsu, graphs, trees

01 Tree

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

Permutation Shift

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

Monsters

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

Euclid's nightmare

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

Preorder

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

MST Unification

binary search, dsu, graphs, greedy

Sum over all Substrings (Hard Version)

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

Unstable String Sort

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

Weird journey

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

Information Graph

dfs and similar, dsu, graphs, trees

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Light Bulbs (Easy Version)

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

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Beard Graph

data structures, dsu, trees

Counter Attack

data structures, dsu, graphs, hashing, sortings

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

Petya and Spiders

bitmasks, dp, dsu

Valera and Swaps

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

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Fools and Foolproof Roads

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

0-1-Tree

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

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Tourism

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

Ring Road 2

2-sat, dfs and similar, dsu, graphs

Figure Fixing

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

Anonymity Is Important

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

Cars

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

Robots on a Grid

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

Table Compression

dfs and similar, dp, dsu, graphs, greedy

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Love Triangles

dfs and similar, dsu, graphs

Kuro and GCD and XOR and SUM

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

Chain Reaction

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

Trader Problem

data structures, dsu, greedy, sortings

AND-MEX Walk

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

Gift

dsu, graphs, sortings, trees

Network Safety

dfs and similar, dsu, graphs, math, sortings

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Leaders

dfs and similar, dsu, graphs, trees

School

dp, dsu

Lomsat gelral

data structures, dfs and similar, dsu, trees

Dominant Indices

data structures, dsu, trees

Dogeforces

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

Qpwoeirut and Vertices

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

Edges in MST

dfs and similar, dsu, graphs, sortings

Envy

data structures, dsu, graphs

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Merging Towers

data structures, dsu, implementation, trees

Number of Groups

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

Unique Occurrences

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

Max to the Right of Min

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

Infinite Card Game

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

st-Spanning Tree

dsu, graphs, greedy, implementation

New Year Domino

data structures, dp, dsu

Columns Swaps

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

Li Hua and Array

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

City Union

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

Bipartite Segments

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

Interestring graph and Apples

dfs and similar, dsu, graphs