Cut and Stick

binary search, data structures, greedy, implementation, sortings

Product 1 Modulo N

greedy, number theory

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

Add One

dp, matrices

AND Sequences

bitmasks, combinatorics, constructive algorithms, math

Short Task

brute force, dp, math, number theory

Education

brute force, dp, greedy, implementation

Permutation by Sum

brute force, greedy, math

Chips on a Board

bitmasks, brute force, data structures, dp, games, two pointers

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Colorings and Dominoes

combinatorics, dp, greedy, math

Min Cost String

brute force, constructive algorithms, graphs, greedy, strings

Japanese Game

constructive algorithms, math

Is It Rated?

greedy, interactive, math, probabilities

Hard Optimization

dp

Guide

Fiber Shape

Equilibrium Point /\textbackslash/\textbackslash

Digits

dp, math, number theory

Cactus Not Enough

dfs and similar, graph matchings, graphs

Button Lock

flows, graph matchings, graphs

ASCII Automata Art

The Sports Festival

dp, greedy

Optimal Encoding

brute force, data structures

Tree Calendar

brute force, constructive algorithms, data structures, dfs and similar, sortings, trees

Swap Pass

constructive algorithms, geometry, sortings

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Almost Sorted

binary search, combinatorics, constructive algorithms, implementation

Binary Literature

constructive algorithms, greedy, implementation, strings, two pointers

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Restoring the Permutation

constructive algorithms, implementation

Epic Transformation

constructive algorithms, data structures, greedy

Mysterious language again, seriously?

*special problem

L BREAK into program

*special problem

Encoded message

*special problem, implementation

Math

*special problem, math

Cakewalk

*special problem, greedy, implementation, shortest paths

Xenolith? Hippodrome?

*special problem, number theory

Fibonacci Words

*special problem, implementation

DMCA

*special problem, implementation, number theory

Balance the Cards

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation

2-Coloring

combinatorics, dp, math

Flip the Cards

2-sat, constructive algorithms, data structures, greedy, sortings, two pointers

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers

3-Coloring

constructive algorithms, games, interactive

Balance the Bits

constructive algorithms, greedy

Cupboards Jumps

dp

Subset Trick

binary search, data structures

Tiles for Bathroom

data structures, sortings, two pointers

Matrix Sorting

bitmasks, brute force, constructive algorithms, greedy, two pointers

Two chandeliers

binary search, brute force, chinese remainder theorem, math, number theory

Going Home

brute force, hashing, implementation, math

Graph Coloring

data structures, graphs, interactive

Diameter Cuts

combinatorics, dfs and similar, dp, trees

Chaotic Merge

combinatorics, dp, math, strings

The Number of Pairs

dp, math, number theory

Minimum Grid Path

brute force, data structures, greedy, math

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

Two Houses

brute force, graphs, greedy, interactive, sortings

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Planar Reflections

brute force, data structures, dp

Square-Free Division (hard version)

data structures, dp, greedy, math, number theory, two pointers

Square-Free Division (easy version)

data structures, dp, greedy, math, number theory, two pointers

Genius

bitmasks, dp, graphs, number theory

k-LCM (hard version)

constructive algorithms, math

Squares

constructive algorithms, data structures, dp, graphs, trees

Qingshan and Daniel

brute force, data structures, greedy, implementation

BFS Trees

combinatorics, dfs and similar, graphs, math, shortest paths, trees

Garden of the Sun

constructive algorithms, graphs

Let's Go Hiking

games, greedy

Delete The Edges

brute force, constructive algorithms, dfs and similar, graphs, implementation

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

1D Sokoban

binary search, dp, greedy, implementation, two pointers

Berland Crossword

bitmasks, brute force, greedy, implementation

Enchanted Matrix

bitmasks, interactive, number theory

Enormous XOR

bitmasks, constructive algorithms, greedy, math, strings, two pointers

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

K-beautiful Strings

binary search, brute force, constructive algorithms, greedy, strings

Almost Fault-Tolerant Database

brute force, constructive algorithms, dfs and similar, greedy, implementation

Genius's Gambit

bitmasks, constructive algorithms, greedy, math

Maximum width

binary search, data structures, dp, greedy, two pointers

Ruler Of The Zoo

brute force, data structures

Yuezheng Ling and Dynamic Tree

data structures, trees

Switch and Flip

constructive algorithms, graphs, math

Magnets

binary search, constructive algorithms, interactive

Fib-tree

brute force, dfs and similar, divide and conquer, number theory, trees

Zookeeper and The Infinite Zoo

bitmasks, constructive algorithms, dp, greedy, math

Pekora and Trampoline

brute force, data structures, dp, greedy, implementation

Old Floppy Drive

binary search, data structures, math

Equalize the Array

binary search, data structures, greedy, math, sortings

Accidental Victory

binary search, data structures, greedy

Flower Shop

*special problem, data structures, fft, math

Demonic Invasion

*special problem, flows

Build From Suffixes

*special problem, combinatorics, data structures

Painting Numbers

*special problem, data structures, greedy, number theory

Dogecoin

*special problem, *special problem, binary search, data structures