Inverse Problem

*special problem, combinatorics, dp

Chess Rush

*special problem, combinatorics, dp, implementation, math

Again Counting Arrays (Hard Version)

combinatorics, dp, math

Counting Is Fun

combinatorics

Build From Suffixes

*special problem, combinatorics, data structures

Intergalactic Sliding Puzzle

combinatorics, constructive algorithms, math

Three Minimums

combinatorics, constructive algorithms, divide and conquer, dp, fft, math

Short Permutation Problem

combinatorics, dp, fft, math

Game of AI (hard version)

combinatorics, fft, math

Anti-median (Hard Version)

combinatorics, dp, math

Vasily the Bear and Painting Square

bitmasks, combinatorics, dp, implementation

Again Counting Arrays (Easy Version)

combinatorics, dp, fft, math

Sleeping

combinatorics, implementation, math

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Last Number

combinatorics, math

Problems for Codeforces

combinatorics, fft, math

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Flowers and Chocolate

combinatorics, math, matrices

Fake bullions

combinatorics, dfs and similar, dp, graphs, number theory

Byteland coins

combinatorics, dp, math

Maximum Product?

brute force, combinatorics, dp, greedy, implementation, math, two pointers

Omkar and Mosaic

combinatorics, constructive algorithms, math

Multithreading (Hard Version)

combinatorics, implementation, math

Drawing Circles is Fun

combinatorics, geometry

Game of AI (easy version)

combinatorics, constructive algorithms, dp, fft, math

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Toys

brute force, combinatorics

Test Data Generation

combinatorics, divide and conquer, dp, fft, math, number theory

Imitating the Key Tree

combinatorics, dsu, trees

Stairs

combinatorics, divide and conquer, dp, fft, math

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Unique Strings

combinatorics, dp, math

Old Mobile

combinatorics, dp, probabilities

Special Positions

combinatorics, divide and conquer, fft, math

Sweep Line

combinatorics, games, math

Digital Patterns

combinatorics, data structures, implementation, math

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

Doping

combinatorics, dp, math

Problem from Red Panda

combinatorics

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Lucky Pair

combinatorics, data structures, implementation

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Bitonix' Patrol

bitmasks, brute force, combinatorics, dfs and similar, math

Magic Square

combinatorics, constructive algorithms, implementation

Clacking Balls

combinatorics, math, probabilities

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

Weak Subsequence

combinatorics

K Paths

combinatorics, data structures, dp, fft, math

October 18, 2017

combinatorics, dp, implementation, math

Expected Value Again

combinatorics, strings

Bingo!

combinatorics, math, probabilities

AmShZ Farm

combinatorics, fft, math

A Creative Cutout

brute force, combinatorics, math

A Certain Magical Party

combinatorics, data structures, greedy, sortings

Chiori and Doll Picking (hard version)

bitmasks, brute force, combinatorics, math

PalindORme

combinatorics, dp

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Infinite Game

brute force, combinatorics, dp, games, probabilities

Nora's Toy Boxes

bitmasks, combinatorics, dp

Basis

combinatorics, fft, math, number theory

Permutation Counting

brute force, combinatorics, dp, fft, math

Triangle Platinum?

brute force, combinatorics, implementation, interactive, math, probabilities

Game of Questions

bitmasks, combinatorics, dp, fft, math, probabilities

Replace All

combinatorics, dp, math

Sherlock and the Encrypted Data

bitmasks, combinatorics, dp

Festival Organization

combinatorics, math, number theory

INOI Final Contests

combinatorics, dp, fft

Complete the Permutations

combinatorics, fft, graphs, math

Tree nesting

combinatorics, graphs, trees

Pasha and Pipe

binary search, brute force, combinatorics, dp, implementation

New Year Permutations

combinatorics, dp

Pentagon

combinatorics, graphs, matrices

Shake It!

combinatorics, dp, flows, graphs

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Bessie and Cards

combinatorics, dp, math

Card Guessing

combinatorics, dp, probabilities

Interval-Free Permutations

combinatorics

Ksenia and Combinatorics

combinatorics, dp

Pollywog

combinatorics, dp, matrices

Graph Coloring (hard version)

brute force, combinatorics, divide and conquer, dp, fft, graphs

Multithreading (Easy Version)

combinatorics, fft, math

Cowboys

combinatorics, dp, math

Tiles

combinatorics, dp, fft, math

Lesson Timetable

combinatorics, dp, math

Uniformly Branched Trees

combinatorics, dp, trees

Paper Cutting Again

combinatorics, probabilities

Thoroughly Bureaucratic Organization

binary search, combinatorics

A Perfect Problem

combinatorics, dp, math

On Sum of Number of Inversions in Permutations

combinatorics, math

Igor and Interesting Numbers

brute force, combinatorics, dp, math

Prediction

combinatorics, dp, math

Sereja and Cinema

combinatorics, math

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

Minibuses on Venus (hard version)

brute force, combinatorics, dp, math

Dominoes

combinatorics, flows, graph matchings, greedy

Expected Components

combinatorics, math, number theory, probabilities

Randomizer

combinatorics, geometry, probabilities

Illumination

binary search, bitmasks, brute force, combinatorics, dp, math, two pointers