Petya and His Friends

constructive algorithms, math, number theory

Dividing Island

constructive algorithms

Team Arrangement

constructive algorithms, greedy, implementation

Little Frog

constructive algorithms

Disposition

constructive algorithms, math

Black and White

constructive algorithms

Planting Trees

constructive algorithms

Director

constructive algorithms, greedy

Triminoes

constructive algorithms, greedy

Journey

brute force, constructive algorithms, implementation

Strange town

constructive algorithms, math

Safe cracking

brute force, constructive algorithms

3-cycles

constructive algorithms, graphs, greedy

Find Color

constructive algorithms, geometry, implementation, math

Two Paths

constructive algorithms, dsu, graphs, implementation

Tricky and Clever Password

binary search, constructive algorithms, data structures, greedy, hashing, strings

Ant on the Tree

constructive algorithms, dfs and similar, trees

Unordered Subsequence

constructive algorithms, greedy

Multithreading

constructive algorithms

Parquet

combinatorics, constructive algorithms, greedy, implementation

Oranges and Apples

constructive algorithms, sortings

Party

constructive algorithms, graphs, math

Four Segments

brute force, constructive algorithms, geometry, implementation, math

Start of the session

constructive algorithms

Increasing Sequence

constructive algorithms, implementation, math

Greedy Change

constructive algorithms

Obsession with Robots

constructive algorithms, graphs, implementation

Kalevitch and Chess

brute force, constructive algorithms

Longest Regular Bracket Sequence

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

Before an Exam

constructive algorithms, greedy