Collisions

brute force, implementation, math

Knights

geometry, graphs, shortest paths, sortings

Chocolate

dfs and similar, implementation

Ant on the Tree

constructive algorithms, dfs and similar, trees

Number With The Given Amount Of Divisors

brute force, dp, number theory

Unordered Subsequence

constructive algorithms, greedy

Parquet

combinatorics, constructive algorithms, greedy, implementation

Roads not only in Berland

dsu, graphs, trees

Roads in Berland

graphs, shortest paths

Segments

greedy, sortings

Stripe 2

binary search, dp, sortings

Intersection

implementation, math

Jabber ID

implementation, strings

Dijkstra?

graphs, shortest paths

Equation

math

Checkout Assistant

dp

Flag 2

dp

Seller Bob

brute force, dp, greedy

Fish

bitmasks, dp, probabilities

Logging

implementation, strings

Industrial Nim

games

Camels

dp

Two Paths

dfs and similar, dp, graphs, shortest paths, trees, two pointers

Letter A

geometry, implementation

Start of the session

constructive algorithms

Digital Root

number theory

How many trees?

combinatorics, divide and conquer, dp

Looking for Order

bitmasks, dp

Exposition

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

Follow Traffic Rules

implementation, math

Longest Regular Bracket Sequence

constructive algorithms, data structures, dp, greedy, sortings, strings

Lorry

greedy, sortings

The least round way

dp, math

Ancient Berland Circus

geometry, math