Make Connected

brute force, implementation

Grand Finale: Snakes

binary search, interactive, ternary search

Super-Short-Polynomial-San

math, meet-in-the-middle

Inverse Minimum Partition (Hard Version)

dp, greedy, math

Inverse Minimum Partition (Easy Version)

binary search, brute force, dp, geometry, greedy, math, two pointers

Twin Polynomials

combinatorics, graph matchings, math

Rectangles

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

MAD Interactive Problem

constructive algorithms, implementation, interactive

Distinct GCDs (Hard Version)

combinatorics, constructive algorithms, graphs, math, number theory, number theory

Distinct GCDs (Easy Version)

constructive algorithms, graphs, math, number theory

Sink

data structures, divide and conquer, dsu, graphs, implementation

Palindrome Flipping

brute force, constructive algorithms, graphs, implementation, shortest paths, strings

Hyper Smawk Bros

dp, dp, games

Keygen 3

brute force, combinatorics, constructive algorithms, dfs and similar, math

Isaac's Queries

bitmasks, brute force, constructive algorithms, dfs and similar, divide and conquer, dp, greedy, interactive, math, probabilities

Git Gud

brute force, constructive algorithms, divide and conquer, math, ternary search

Adjusting Drones

binary search, brute force, data structures, dp, dsu, greedy, implementation, sortings

Billion Players Game

binary search, greedy, math, sortings, ternary search, two pointers

Strange Operation (Hard Version)

data structures, greedy, trees

Strange Operation (Easy Version)

brute force, data structures, greedy, implementation, sortings

Best Time to Buy and Sell Stock

binary search, brute force, data structures, dp, games, graphs, greedy

Find the Last Number

binary search, bitmasks, constructive algorithms, interactive

Juan's Colorful Tree

data structures, dfs and similar, dfs and similar, dsu, graphs, graphs, meet-in-the-middle, trees

Mimo & Yuyu

games, greedy, math

Batteries

brute force, constructive algorithms, graph matchings, graphs, interactive, math

The Ancient Wizards' Capes

brute force, greedy, implementation

Bombing (Hard Version)

combinatorics, dp

Bombing (Easy Version)

brute force, combinatorics, constructive algorithms, implementation, math

No Mind To Think

binary search, divide and conquer, greedy, sortings, ternary search, two pointers

Catshock

constructive algorithms, dfs and similar, graphs, trees, two pointers

No Cost Too Great (Hard Version)

greedy, math, number theory

Odd Queries on Odd Array

bitmasks, brute force, data structures, implementation, trees

Zero Trailing Factorial

brute force, math, number theory

Not Alone

dp, greedy

Victorious Coloring (Hard Version)

data structures, greedy, schedules

Victorious Coloring (Easy Version)

dfs and similar, dp, greedy

Query Jungle

data structures, implementation, math, matrices, trees

Triple Attack

data structures, greedy

Monotone Subsequence

constructive algorithms, graphs, greedy, interactive, math

Division Versus Addition

games, greedy, math

Counting Is Fun: The Finale

combinatorics, implementation

Cycle Closing

constructive algorithms, graphs, implementation, shortest paths, trees

Hidden Single (Version 2)

binary search, divide and conquer, interactive, math, probabilities

Hidden Single (Version 1)

divide and conquer, interactive, math, probabilities, sortings

Attraction Theory

combinatorics, dp, math

Limited Edition Shop

data structures, dp

Grid Counting

combinatorics, implementation, math

Buratsuta 3

binary search, brute force, data structures, divide and conquer, probabilities

Nezuko in the Clearing

binary search, math, ternary search

Farmer John's Last Wish

binary search, data structures, math, number theory

Gravity Falls

greedy, implementation, sortings

Longest Increasing Path (Hard Version)

constructive algorithms, math

Longest Increasing Path (Easy Version)

constructive algorithms, math

Maxflow GCD Coloring

constructive algorithms, flows, graphs

Modular Tetration

combinatorics, math, number theory

Exchange Queries

combinatorics, data structures, greedy

Maximum OR Popcount

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

Game on Array

games, greedy

Bubble Sort

brute force, combinatorics, dp

Yet Another MEX Problem

brute force, constructive algorithms, data structures, divide and conquer, greedy, hashing

Max Sum OR (Hard Version)

bitmasks, constructive algorithms, divide and conquer, greedy

Cost of Coloring

combinatorics, divide and conquer, dp, fft, math

Long Journey

dfs and similar, divide and conquer, dp, graphs, greedy, math, matrices, number theory

Predicting Popularity

binary search, data structures, greedy, sortings

Inversion Value of a Permutation

constructive algorithms, dfs and similar, dp

Bracket Groups

brute force, constructive algorithms, dp, string suffix structures, strings

Looking at Towers (difficult version)

combinatorics, data structures, dp

Looking at Towers (easy version)

combinatorics, dp

Price Tags

brute force, dp, math

Increasing Xor

bitmasks, data structures, math

Make Good

constructive algorithms, greedy, math, strings

Inversion Graph Coloring (Hard Version)

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

Inversion Graph Coloring (Easy Version)

combinatorics, data structures, dp, greedy, two pointers

Color the Tree

*special problem

Merging Vertices in a Graph

*special problem, dfs and similar, dsu, graphs

Good Robot Paths

*special problem, data structures, geometry, sortings

Array Reduction

*special problem, greedy

Perfect Cut

*special problem, dp, greedy

Avoid Minimums

*special problem, greedy, math

Minimum on Subarrays

*special problem, brute force

Sum Minimisation

number theory

Prime Gaming (Hard Version)

bitmasks, combinatorics, dp, probabilities

Prime Gaming (Easy Version)

bitmasks, combinatorics, dp

A Cruel Segment's Thesis

data structures, greedy, sortings

Ode to the Bridge Builder

constructive algorithms, geometry

Determinant Construction (Hard Version)

brute force, constructive algorithms, math, matrices, number theory

Determinant Construction (Easy Version)

brute force, constructive algorithms, math, matrices, number theory

Antiamuny and Slider Movement

brute force, combinatorics, implementation, math, sortings

Maple and Tree Beauty (Hard Version)

bitmasks, brute force, dfs and similar, dp, fft, trees

Maple and Tree Beauty (Easy Version)

brute force, dfs and similar, dp, graphs, trees

Antiamuny Wants to Learn Swap

data structures, greedy, two pointers

Cry Me a River

dfs and similar, dp, games, graphs

Prefix Maximum Invariance

binary search, combinatorics, data structures, sortings

To the Infinity

data structures, hashing, math, trees

Beyond the Palindrome (Hard Version)

combinatorics, dp, math, number theory

Beyond the Palindrome (Easy Version)

combinatorics, dp, math

From the Unknown (Hard Version)

brute force, constructive algorithms, interactive, math

From the Unknown (Easy Version)

constructive algorithms, interactive, math

By the Assignment

binary search, bitmasks, combinatorics, dfs and similar, dsu, graphs, math

For the Champion

constructive algorithms, interactive, math