Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Programming Competition

dfs and similar, dp, graph matchings, greedy, trees

Three Activities

brute force, dp, greedy, implementation, sortings

Array Collapse

data structures, divide and conquer, dp, trees

Kim's Quest

bitmasks, combinatorics, dp

Inverse Problem

*special problem, combinatorics, dp

Maximum Sum Subarrays

*special problem, dp

Short Permutation Problem

combinatorics, dp, fft, math

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Count BFS Graph

combinatorics, dp

Twin Friends

combinatorics, dp

Merge Not Sort

constructive algorithms, dp

One-X

combinatorics, dfs and similar, dp, math, trees

Collecting Game

binary search, dp, greedy, sortings, two pointers

Maximum And Queries (hard version)

bitmasks, divide and conquer, dp, greedy

Robot Queries

binary search, data structures, dp, implementation

Compressed Tree

dfs and similar, dp, graphs, greedy, sortings, trees

Yet Another Monster Fight

binary search, dp, greedy, implementation, math

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Small GCD

bitmasks, brute force, dp, math, number theory

Anji's Binary Tree

dfs and similar, dp, trees

Laura and Operations

dp, math

Yarik and Array

dp, greedy, two pointers

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

Fancy Arrays

combinatorics, dp, math, matrices

Infinite Card Game

binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Doremy's Average Tree

data structures, dp, greedy, trees

Doremy's Drying Plan (Hard Version)

data structures, dp

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Counting Rhyme

dp, math, number theory

Medium Design

brute force, data structures, dp, greedy, sortings

Raspberries

dp, math

Tree XOR

bitmasks, dfs and similar, dp, greedy, trees

Minimum Maximum Distance

dfs and similar, dp, graphs, shortest paths, trees

Block Sequence

dp

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

Make it Alternating

combinatorics, dp, greedy

Ball-Stackable

constructive algorithms, data structures, dp, trees

Jellyfish and Mex

dp

Jellyfish and Inscryption

dp

Jellyfish and OEIS

dp

Jellyfish and Hack

dp, math

Jellyfish and Miku

divide and conquer, dp, math, probabilities

Jellyfish and EVA

dp, graphs, greedy, math, probabilities

Jellyfish and Math

bitmasks, brute force, dfs and similar, dp, graphs, shortest paths

Data Structures Fan

binary search, bitmasks, data structures, dp

Another MEX Problem

bitmasks, brute force, dp, shortest paths

Colorful Table

binary search, data structures, dp, implementation, math, two pointers

Min-Sum-Max

constructive algorithms, dp, greedy

Travel Plan

combinatorics, dp, implementation, math, trees

Candy Party (Hard Version)

bitmasks, constructive algorithms, dp, greedy, implementation, math

Mighty Rock Tower

brute force, combinatorics, dp, math, probabilities

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

Jackets and Packets

dp

Imagination Castle

dp, games, two pointers

Grouped Carriages

binary search, data structures, dp, flows, greedy

Elevators of Tamem

dp

Digital Wallet

dp, greedy

Completely Searching for Inversions

dfs and similar, dp, graphs

Asterism Stream

dp, math, matrices

Matrix Cascade

brute force, constructive algorithms, data structures, dp, greedy, math

Redundant Routes

constructive algorithms, dp, trees

Goldberg Machine 3

dp, trees

Swaps

combinatorics, dp, graphs, math

Divide, XOR, and Conquer

bitmasks, dp, math

Speedrun

brute force, dfs and similar, dp, graphs, greedy, math, sortings, two pointers

Magic Will Save the World

binary search, bitmasks, brute force, dp

Gift Carpet

dp, greedy, implementation, strings

Non-Intersecting Subpermutations

combinatorics, dp, implementation, math

Sorting By Multiplication

dp, greedy

Two Binary Strings

constructive algorithms, dp, greedy

Balanced String

dp

Game on Permutation

data structures, dp, games, greedy

Maximum Monogonosity

brute force, dp, math

Andrey and Escape from Capygrad

binary search, data structures, dp, dsu, greedy, sortings

Another Permutation Problem

brute force, dp, greedy, math

Trees and Segments

brute force, data structures, dp, greedy, two pointers

The Walkway

brute force, dp, greedy, math, number theory

PermuTree (hard version)

bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees

PermuTree (easy version)

dfs and similar, dp, trees

To Become Max

binary search, brute force, data structures, dp

Mark and Spaceship

brute force, dp

Game Bundles

brute force, constructive algorithms, dp, greedy, math

Expected Destruction

combinatorics, dp, math, probabilities

Earn or Unlock

bitmasks, brute force, dp

Panda Meetups

data structures, dp, flows

Miriany and Matchstick

constructive algorithms, dp, greedy

Ina of the Mountain

data structures, dp, greedy, math

Nastya and Potions

dfs and similar, dp, graphs, sortings

Max to the Right of Min

binary search, data structures, divide and conquer, dp, dsu, two pointers

Vika and Wiki

binary search, bitmasks, combinatorics, divide and conquer, dp, math

Vampiric Powers, anyone?

bitmasks, brute force, dp, greedy

Rudolf and CodeVid-23

bitmasks, dp, graphs, greedy, shortest paths