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

Find Extra One

geometry, implementation

Letters Removing

data structures, strings

Segments Removal

data structures, dsu, flows, implementation, two pointers

Shovel Sale

constructive algorithms, math

Dividing the numbers

constructive algorithms, graphs, math

Months and Years

implementation

Splitting in Teams

constructive algorithms, greedy, math

Restoring the Expression

brute force, hashing, math

Squares and not squares

constructive algorithms, greedy

Alarm Clock

greedy

Phone Numbers

implementation, strings

Proper Nutrition

brute force, implementation, number theory

Rounding

implementation, math

Chtholly's request

brute force

Scarborough Fair

implementation

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

Pizza Separation

brute force, implementation

Ralph and Mushrooms

dp, graphs

Ralph And His Tour in Binary Country

brute force, data structures, trees