Square Root of Permutation

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

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Vika and Segments

constructive algorithms, data structures, geometry, two pointers

Harmony Analysis

constructive algorithms

Vika and Squares

constructive algorithms, implementation

The Best Gift

constructive algorithms, implementation

Lazy Student

constructive algorithms, data structures, graphs

Sorting Railway Cars

constructive algorithms, greedy

Make Palindrome

constructive algorithms, greedy, strings

Vitaly and Night

constructive algorithms, implementation

Beautiful Function

constructive algorithms, math

Anton and Ira

constructive algorithms, greedy, math

Marina and Vasya

constructive algorithms, greedy, strings

Once Again...

constructive algorithms, dp, matrices

GCD Table

constructive algorithms, greedy, number theory

Three Logos

bitmasks, brute force, constructive algorithms, geometry, implementation, math

Walking!

constructive algorithms, greedy

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Tablecity

constructive algorithms, implementation

Bear and Drawing

constructive algorithms, dfs and similar, trees

CNF 2

constructive algorithms, dfs and similar, graphs, greedy

Tree Requests

binary search, bitmasks, constructive algorithms, dfs and similar, graphs, trees

Replacement

constructive algorithms, data structures, implementation

Simple Game

constructive algorithms, games, greedy, implementation, math

Restoring Map

bitmasks, constructive algorithms, trees

Replicating Processes

constructive algorithms, greedy

Gerald is into Art

constructive algorithms, implementation

Pasha and Tea

constructive algorithms, implementation, math, sortings

Kyoya and Permutation

binary search, combinatorics, constructive algorithms, greedy, implementation, math

ZgukistringZ

brute force, constructive algorithms, implementation, strings

Brackets in Implications

constructive algorithms, greedy, implementation, math

Regular Bridge

constructive algorithms, graphs, implementation

Happy Line

constructive algorithms, greedy, sortings

Looksery Party

constructive algorithms, dfs and similar, graphs, greedy

Mike and Fish

constructive algorithms, dfs and similar, graphs

Soldier and Number Game

constructive algorithms, dp, math, number theory

Sea and Islands

constructive algorithms, implementation

Listening to Music

constructive algorithms, data structures

Destroying Roads

constructive algorithms, graphs, shortest paths

Idempotent functions

constructive algorithms, graphs, math

Berserk Robot

constructive algorithms, math, sortings

Weird Chess

brute force, constructive algorithms, implementation

Quasi Binary

constructive algorithms, dp, greedy, implementation

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

Handshakes

binary search, constructive algorithms, data structures, greedy

Exam

constructive algorithms, implementation, math

Correcting Mistakes

constructive algorithms, dp, greedy, hashing, strings, two pointers

Arthur and Walls

constructive algorithms, data structures, graphs, greedy, shortest paths

Pasha and String

constructive algorithms, greedy, math, strings

Anya and Smartphone

constructive algorithms, data structures, implementation

Vitaly and Strings

constructive algorithms, strings

Drazil and Tiles

constructive algorithms, greedy

Constrained Tree

constructive algorithms, data structures

Game

constructive algorithms, math

Fox And Polygon

constructive algorithms, divide and conquer

Restoring Numbers

constructive algorithms, math

Painting Pebbles

constructive algorithms, greedy, implementation

Anya and Ghosts

constructive algorithms, greedy

Misha and Forest

constructive algorithms, data structures, greedy, sortings, trees

New Year Book Reading

constructive algorithms, greedy, implementation, math

Removing Columns

brute force, constructive algorithms, implementation

Secret Combination

brute force, constructive algorithms, implementation

Vasya and Chess

constructive algorithms, games, math

Up the hill

constructive algorithms, implementation

Candy Boxes

brute force, constructive algorithms, math

Prefix Product Sequence

constructive algorithms, math, number theory

Sign on Fence

binary search, constructive algorithms, data structures

Bits

bitmasks, constructive algorithms

Interesting Array

constructive algorithms, data structures, trees

Diverse Permutation

constructive algorithms, greedy

Towers

brute force, constructive algorithms, greedy, implementation, sortings

Random Teams

combinatorics, constructive algorithms, greedy, math

Dreamoon and Sets

constructive algorithms, greedy, math

Kamal-ol-molk's Painting

brute force, constructive algorithms, greedy

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

Design Tutorial: Learn from a Game

constructive algorithms, implementation

Hack it!

binary search, constructive algorithms, math

24 Game

constructive algorithms, greedy, math

Fedor and New Game

bitmasks, brute force, constructive algorithms, implementation

Little Victor and Set

brute force, constructive algorithms, math

Pashmak and Buses

combinatorics, constructive algorithms, math

Flow Optimality

constructive algorithms, flows, math

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs

4-point polyline

brute force, constructive algorithms, geometry, trees

Jzzhu and Apples

constructive algorithms, number theory

Anton and Letters

constructive algorithms, implementation

Valera and Swaps

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

Valera and Tubes

constructive algorithms, dfs and similar, implementation

Devu and Partitioning of the Array

brute force, constructive algorithms, implementation, number theory

Square Tiling

constructive algorithms, greedy

Points and Segments (easy)

constructive algorithms, sortings

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

Biathlon Track

binary search, brute force, constructive algorithms, data structures, dp

Pasha and Hamsters

constructive algorithms, implementation

Square Table

constructive algorithms, math, probabilities

Football

constructive algorithms, graphs, implementation

Mashmokh and Numbers

constructive algorithms, number theory

A + B Strikes Back

*special problem, brute force, constructive algorithms, dsu, implementation

Searching for Graph

brute force, constructive algorithms, graphs