Connected Components?

data structures, dfs and similar, dsu, graphs

Tanks

dp, greedy, implementation

Swap Adjacent Elements

dfs and similar, greedy, math, sortings, two pointers

Tea Queue

implementation

Water The Garden

implementation

A Game With Numbers

games, graphs, shortest paths

Congruence Equation

chinese remainder theorem, math, number theory

Substring

dfs and similar, dp, graphs

Seat Arrangements

brute force, implementation

Perfect Number

binary search, brute force, dp, implementation, number theory

Supermarket

brute force, greedy, implementation

Radio Station

implementation, strings

Eleven

brute force, implementation

Upside Down

data structures, string suffix structures, strings, trees

Stranger Trees

dp, math, matrices, trees

Pollywog

combinatorics, dp, matrices

MADMAX

dfs and similar, dp, games, graphs

The Monster

dp, greedy, implementation, math

Jamie and Tree

data structures, trees

Jamie and To-do List

data structures, interactive, trees

Jamie and Interesting Graph

constructive algorithms, graphs, shortest paths

Jamie and Binary Sequence (changed after round)

bitmasks, greedy, math

Jamie and Alarm Snooze

brute force, implementation, math

Coprime Arrays

math, number theory

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Physical Education Lessons

data structures, implementation, sortings

Almost Acyclic Graph

dfs and similar, graphs

Permute Digits

dp, greedy

Browser

implementation

Garden

implementation

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Substrings in a String

bitmasks, brute force, data structures, string suffix structures, strings

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Bash and a Tough Math Puzzle

data structures, number theory

Travelling Salesman and Special Numbers

brute force, combinatorics, dp

Conan and Agasa play a Card Game

games, greedy, implementation

Perfect Squares

brute force, implementation, math

Don't Exceed

math, probabilities

Power Substring

math, number theory

Strongly Connected Tournament

dp, graphs, math, probabilities

Logical Expression

bitmasks, dp, shortest paths

Too Easy Problems

binary search, brute force, data structures, greedy, sortings

Party Lemonade

bitmasks, dp, greedy

Christmas Spruce

implementation, trees

Modular Exponentiation

implementation, math

Prime Gift

binary search, dfs and similar, math, meet-in-the-middle, number theory, two pointers

Fishes

data structures, graphs, greedy, probabilities, shortest paths

Perun, Ult!

brute force, greedy, sortings

New Year's Eve

bitmasks, constructive algorithms, number theory

Tricky Alchemy

implementation

Mass Change Queries

data structures

Tree Destruction

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

Stack Sorting

constructive algorithms, data structures, greedy, implementation

Inversion Counting

brute force, math

Three Garlands

brute force, constructive algorithms

Two Cakes

binary search, brute force, implementation

Nearest Minimums

implementation

Minimum Sum

constructive algorithms, greedy, math

Door Frames

greedy, implementation

The Way to Home

dfs and similar, dp, greedy, implementation

AND-permutations

constructive algorithms

Coprocessor

dfs and similar, dp, graphs, greedy

Colorful Points

data structures, greedy, implementation

Python Indentation

dp

Segments

constructive algorithms, math

Generate Login

brute force, greedy, sortings

New Year and Boolean Bridges

New Year and Original Order

dp, math

New Year and Rainbow Roads

graphs, greedy, implementation

New Year and Entity Enumeration

bitmasks, combinatorics, dp, math

New Year and Arbitrary Arrangement

dp, math, probabilities

New Year and Curling

brute force, geometry, implementation, math

New Year and Buggy Bot

brute force, implementation

New Year and Counting Cards

brute force, implementation

Tic-Tac-Toe

implementation

Masha and Bears

brute force, implementation

Reverses

dp, string suffix structures, strings

Power Tower

chinese remainder theorem, math, number theory

Party

bitmasks, brute force, dp, graphs

Seating of Students

brute force, constructive algorithms, math

Shockers

implementation, strings

Yet Another Maxflow Problem

data structures, flows, graphs

Clear The Matrix

bitmasks, dp

Swapping Characters

brute force, hashing, implementation, strings

Almost Difference

data structures, math

Boxes Packing

greedy

The Modcrab

greedy, implementation

Hungry Student Problem

greedy, implementation

Coloring a Tree

dfs and similar, dsu, greedy

Visiting a Friend

greedy, implementation

Cyclic Cipher

fft, math

Weighting a Tree

constructive algorithms, dfs and similar, graphs

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

GCD of Polynomials

constructive algorithms, math

Hashing Trees

constructive algorithms, trees

Maximum Questions

data structures, dp, strings

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Remove Extra One

brute force, data structures, math

Position in Fraction

math, number theory