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

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

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

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

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

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

Minimum Sum

constructive algorithms, greedy, math

Door Frames

greedy, implementation

AND-permutations

constructive algorithms

Coprocessor

dfs and similar, dp, graphs, greedy

Colorful Points

data structures, greedy, implementation

Python Indentation

dp

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

Tic-Tac-Toe

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

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

Letters Removing

data structures, strings

Segments Removal

data structures, dsu, flows, implementation, two pointers

Shovel Sale

constructive algorithms, math

Restoring the Expression

brute force, hashing, math

Squares and not squares

constructive algorithms, greedy

Alarm Clock

greedy

Phone Numbers

implementation, strings

Welcome home, Chtholly

data structures, dsu

Nephren Runs a Cinema

chinese remainder theorem, combinatorics, math, number theory

Willem, Chtholly and Seniorious

data structures, probabilities

Ithea Plays With Chtholly

binary search, constructive algorithms, games, greedy, interactive

Nephren gives a riddle

binary search, dfs and similar

Eyes Closed

data structures, probabilities

String Mark

combinatorics, math, strings

Square Subsets

bitmasks, combinatorics, dp, math

XK Segments

binary search, math, sortings, two pointers

Ralph and Mushrooms

dp, graphs

Ralph And His Tour in Binary Country

brute force, data structures, trees

Marco and GCD Sequence

constructive algorithms, math

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

Subtree Minimum Query

data structures, trees

Counting Arrays

combinatorics, dp, math, number theory

Credit Card

data structures, dp, greedy, implementation

Lust

combinatorics, math, matrices

Sloth

dfs and similar, dp, graph matchings, trees

Envy

data structures, dsu, graphs

Gluttony

constructive algorithms, greedy

Pride

brute force, dp, greedy, math, number theory

Mod Mod Mod

binary search, dp, math

Xor-MST

bitmasks, constructive algorithms, data structures

Connecting Vertices

dp, graphs

Maximum Subsequence

bitmasks, divide and conquer, meet-in-the-middle

Almost Identity Permutations

combinatorics, dp, math

K-Dominant Character

binary search, implementation, two pointers

Row of Models

greedy, sortings

Little Brother

binary search, geometry, sortings

Ratings and Reality Shows

data structures, two pointers

Solution for Cube

brute force, implementation

Symmetric Projections

geometry