Triangle Platinum?

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

Fibonacci Number

brute force, math, matrices

GCD Master (easy version)

greedy, math, number theory, sortings

Festival Organization

combinatorics, math, number theory

Ruminations on Ruminants

geometry, math

RC Kaboom Show

binary search, brute force, data structures, geometry, math

Anti-Increasing Addicts

constructive algorithms, dp, greedy, math

Tubular Bells

interactive, math, number theory, probabilities

Multithreading (Easy Version)

combinatorics, fft, math

Coins Exhibition

data structures, dp, math

Expected Components

combinatorics, math, number theory, probabilities

Converging Array (Hard Version)

dp, math

Doctor's Brown Hypothesis

dfs and similar, graphs, math, number theory

Omkar and Pies

bitmasks, dfs and similar, dp, math, shortest paths

Black Widow

dp, graphs, implementation, math

Lazy Numbers

binary search, math

Make Square

math

List Generation

combinatorics, dp, math

Lost Array

bitmasks, combinatorics, constructive algorithms, dp, math

Nephren Runs a Cinema

chinese remainder theorem, combinatorics, math, number theory

Ciel and Flipboard

dp, greedy, math

Wizards and Bets

dfs and similar, graphs, math, matrices

Cute number

binary search, brute force, data structures, dsu, implementation, math

Optimal Point

binary search, math

Quadratic Set

constructive algorithms, hashing, math, number theory

Tricolor Triangles

brute force, graphs, math, matrices

Bears and Juice

dp, math, meet-in-the-middle

Bandit Blues

combinatorics, dp, fft, math

Present for Vitalik the Philatelist

combinatorics, math, number theory

GCD Table

chinese remainder theorem, math, number theory

Ghd

brute force, math, probabilities

DravDe saves the world

geometry, math

Marmots (hard)

math, probabilities

Counting Skyscrapers

dp, math, probabilities

Hamming Triples

implementation, math, two pointers

Hard Design

greedy, implementation, math

Familiar Operations

brute force, graphs, math

Polo the Penguin and Lucky Numbers

dp, implementation, math

Sign Posts

brute force, geometry, math

Game of Questions

bitmasks, combinatorics, dp, fft, math, probabilities

Bessie and Cards

combinatorics, dp, math

Teamwork

constructive algorithms, greedy, math

Fading into Fog

geometry, interactive, math, probabilities

Swimmers in the Pool

dp, fft, math, number theory

Appleman and Complicated Task

dsu, math

Boolean Computer

bitmasks, brute force, fft, math

Min Cost Permutation (Hard Version)

binary search, constructive algorithms, data structures, greedy, math, sortings

Tournament Construction

constructive algorithms, dp, graphs, greedy, math

DZY Loves Games

math, matrices, probabilities

Tiles

combinatorics, dp, fft, math

Random Elections

bitmasks, brute force, divide and conquer, fft, math

Inverse Genealogy

constructive algorithms, divide and conquer, dp, math, trees

Location

data structures, dp, math, number theory

Prediction

combinatorics, dp, math

Minibuses on Venus (hard version)

brute force, combinatorics, dp, math

Random Forest Rank

dp, graph matchings, math, trees

Permutations

math, matrices

Vasya and Polynomial

math

Sum Over Subsets

combinatorics, math, number theory

Ants on a Circle

constructive algorithms, math

Swaps

combinatorics, dp, graphs, math

M-tree

data structures, math, sortings, trees

Equal Reversal

constructive algorithms, graphs, implementation, math

Bear and Paradox

binary search, greedy, math, sortings

Euclid Guess

constructive algorithms, flows, graph matchings, math, number theory

Rainbow Balls

math

Strongly Connected Tournament

dp, graphs, math, probabilities

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Jellyfish and Miku

divide and conquer, dp, math, probabilities

Choosing Carrot

games, math

Prince's Problem

brute force, data structures, math, number theory, trees

A Random Code Problem

combinatorics, dp, math, number theory, probabilities

Yash And Trees

bitmasks, data structures, dfs and similar, math, number theory

Cow Tennis Tournament

combinatorics, data structures, math

Switch and Flip

constructive algorithms, graphs, math

Polygons

greedy, math, number theory

LEGOndary Grandmaster

combinatorics, dp, math

Ladies' Shop

constructive algorithms, fft, math

Tenzing and Random Operations

combinatorics, dp, math, probabilities

Secure Password

bitmasks, combinatorics, constructive algorithms, interactive, math

Game of Pairs

constructive algorithms, dfs and similar, interactive, math, number theory

New Year and Original Order

dp, math

Lucky Interval

brute force, math

Sleeping

combinatorics, implementation, math

Sasha Circle

geometry, math

Berland Traffic

math, matrices

Long sequence

brute force, math, matrices

Ksusha and Square

geometry, math, probabilities, two pointers

Design Tutorial: Change the Goal

constructive algorithms, math, matrices

Appropriate Team

bitmasks, math, number theory

October 18, 2017

combinatorics, dp, implementation, math

Bingo!

combinatorics, math, probabilities

Mutation

bitmasks, dp, math

Concise and clear

brute force, greedy, implementation, math

Prime Divisors Selection

binary search, greedy, math, number theory

Permutation Counting

brute force, combinatorics, dp, fft, math

Roland and Rose

brute force, geometry, math, sortings

Shortest path

brute force, geometry, math, shortest paths

Coins

math

You Are Given Some Letters...

binary search, implementation, math