Communication Towers

brute force, divide and conquer, dsu

Cutting a Fence

binary search, data structures, dsu

Gasoline prices

data structures, divide and conquer, dsu, hashing, trees

Joker

*special problem, bitmasks, data structures, divide and conquer, dsu

Permutation Weight (Easy Version)

constructive algorithms, dfs and similar, dsu

Edge Queries

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

Smooth Sailing (Hard Version)

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

Savior

brute force, dsu, math

Andrey's Tree

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

Dima and Kicks

brute force, dsu, graphs, implementation

Air Reform

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

Leaders

dfs and similar, dsu, graphs, trees

Distinctification

data structures, dsu, greedy

Appleman and Complicated Task

dsu, math

Li Hua and Path

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

Pairs

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

Building Forest Trails

data structures, dsu

Hercule Poirot Problem

dsu, graphs

Gates to Another World

bitmasks, data structures, dsu, two pointers

Alien DNA

data structures, dsu, trees

Cycle sort

dsu, math

School

dp, dsu

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Island Puzzle

dfs and similar, dsu, graphs, trees

Bakery

data structures, dsu

Flow Control

data structures, dsu, implementation

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Imitating the Key Tree

combinatorics, dsu, trees

Iqea

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

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Dangerous Laser Power

constructive algorithms, dsu, sortings

A Convex Game

dsu, games

Entertaining Geodetics

brute force, dsu, implementation

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Visible Black Areas

data structures, dsu, geometry, trees

MUH and Lots and Lots of Segments

data structures, dsu

Parallel Universes

*special problem, constructive algorithms, dfs and similar, dsu, graphs

Burenka and Pether

*special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees