Negative Time Summation

constructive algorithms

Euler tour

constructive algorithms, trees

Beauty of a Permutation

constructive algorithms, math

Alpha planetary system

constructive algorithms, graphs, shortest paths

Dirty plates

constructive algorithms, math

Flow Optimality

constructive algorithms, flows, math

Restoring Map

bitmasks, constructive algorithms, trees

Princess and Her Shadow

constructive algorithms, shortest paths

Listening to Music

constructive algorithms, data structures

Algoland and Berland

constructive algorithms, divide and conquer, geometry

Homework

constructive algorithms

Xor Permutations

constructive algorithms, math

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

A Preponderant Reunion

constructive algorithms, dp

Perpetual Motion Machine

constructive algorithms, dp, graphs, implementation, math, trees

Berserk Robot

constructive algorithms, math, sortings

Company Acquisitions

constructive algorithms, math

The same permutation

constructive algorithms

Egor and an RPG game

constructive algorithms, greedy

Tree of Life (medium)

constructive algorithms, hashing, trees

Deja Vu

constructive algorithms, graphs, implementation

Deja Vu

constructive algorithms, dp

Create a Maze

constructive algorithms

Lasers and Mirrors

constructive algorithms, math

Get Ready for the Battle

constructive algorithms, implementation

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Tree-Tac-Toe

constructive algorithms, games, trees

Public Service

constructive algorithms, graphs, trees

Sophisticated Device

constructive algorithms

New Road Network

constructive algorithms, greedy, math

Karen and Neighborhood

binary search, constructive algorithms, implementation

Finding lines

constructive algorithms, divide and conquer, interactive

Candies Game

constructive algorithms, greedy

Upgrading Tree

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

Triple Flips

constructive algorithms

Double Knapsack

constructive algorithms, two pointers

Ancient civilizations

constructive algorithms, geometry

Odd Federalization

constructive algorithms

How to Learn You Score

constructive algorithms

Chess Championship

constructive algorithms, flows, greedy, math

Problem of offices

constructive algorithms, dfs and similar, dp, trees

Ants on a Circle

constructive algorithms, math

Mister B and Flight to the Moon

constructive algorithms, graphs

Fox And Polygon

constructive algorithms, divide and conquer

Berland Army

constructive algorithms, graphs, greedy

Nauuo and Portals

constructive algorithms

Lucky Tickets

brute force, constructive algorithms

Magical Permutation

bitmasks, brute force, constructive algorithms, data structures, graphs, math

Almost All

constructive algorithms, trees

Winding polygonal line

constructive algorithms, geometry, greedy, math

Knights

constructive algorithms

Johnny Solving

constructive algorithms, dfs and similar, graphs, math

Inverse of Rows and Columns

brute force, constructive algorithms

Sergey's problem

constructive algorithms, graphs

Necklace

constructive algorithms, math

Hack it!

binary search, constructive algorithms, math

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs

Cube Snake

constructive algorithms

Shift It!

constructive algorithms

Design Tutorial: Learn from a Game

constructive algorithms, implementation

HQ

*special problem, constructive algorithms

Doe Graphs

constructive algorithms, divide and conquer, dp, graphs, shortest paths

AB-Strings

constructive algorithms, strings

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

Tournament Construction

constructive algorithms, dp, graphs, greedy, math

Madness

constructive algorithms, dfs and similar, trees

Tiles Placement

constructive algorithms, dfs and similar, trees

Beautiful Function

constructive algorithms, math

Weighting a Tree

constructive algorithms, dfs and similar, graphs

Once in a casino

constructive algorithms, greedy, implementation, math

Sherlock's bet to Moriarty

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation, trees

One Node is Gone

constructive algorithms, implementation, trees

Hidden Bipartite Graph

binary search, constructive algorithms, dfs and similar, graphs, interactive

Parquet Re-laying

constructive algorithms

Multithreading

constructive algorithms

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

Yaroslav and Algorithm

constructive algorithms

Balance

constructive algorithms, dfs and similar, graphs, trees

Aztec Catacombs

constructive algorithms

Tricky and Clever Password

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

Square Tiling

constructive algorithms, greedy

Splitting the Uniqueness

constructive algorithms

Sign on Fence

binary search, constructive algorithms, data structures

Black and White

constructive algorithms

Suns and Rays

constructive algorithms, dfs and similar, implementation

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

Replicating Processes

constructive algorithms, greedy

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

AND-permutations

constructive algorithms

Minegraphed

constructive algorithms, graphs

Colored Cubes

constructive algorithms, implementation, matrices

Greedy Change

constructive algorithms

Clearing Up

constructive algorithms, dp, dsu, graphs

CNF 2

constructive algorithms, dfs and similar, graphs, greedy

Ladies' Shop

constructive algorithms, fft, math

New Year and the Mallard Expedition

constructive algorithms, greedy

Graph Reconstruction

constructive algorithms

Bear and Drawing

constructive algorithms, dfs and similar, trees

Anton and School

bitmasks, constructive algorithms, implementation, math

Arpa’s overnight party and Mehrdad’s silent entering

constructive algorithms, dfs and similar, graphs