Range Operation

dp, greedy, math, two pointers

Drifting Away

greedy, implementation

Alice and Bob

greedy, implementation

Intercepting Butterflies

bitmasks, communication, constructive algorithms, graphs, interactive

Locate

binary search, combinatorics, communication, constructive algorithms, greedy, interactive

Encode and Decode (Hard Version)

bitmasks, communication, interactive, math

Encode and Decode (Easy Version)

communication, constructive algorithms, interactive

Mukhammadali and the Smooth Array

data structures, dp

Tree, TREE!!!

dfs and similar, dp, math, trees

khba Loves to Sleep!

binary search, data structures, geometry, greedy, implementation

Yet Another Array Problem

brute force, implementation, math, number theory

Isamatdin and His Magic Wand!

constructive algorithms, greedy, implementation, sortings

Your Name

sortings, strings

Square?

math, sortings

Tab Closing

math

Same Difference

brute force, greedy, strings

Arctic Acquisition

data structures, greedy

Rainbow Branch

constructive algorithms, dp, greedy, trees

Path Split

graph matchings, greedy

Binary Wine

bitmasks, greedy, math

Marble Council

dp, math, sortings

Cyclic Merging

constructive algorithms, greedy

PalindromePalindrome

data structures, strings

Pointless Machine

constructive algorithms, graphs, interactive, trees

Chain Prefix Rank (Hard Version)

binary search, combinatorics, data structures, dfs and similar, dp, graphs, math, trees

Chain Prefix Rank (Easy Version)

combinatorics, dfs and similar, dp, math, trees

Journey

data structures, dfs and similar, dsu, graphs, greedy

Copy String

greedy, implementation, strings, two pointers

Dungeon

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

Even Modulo Pair

brute force, math, number theory

Sequence Game

brute force, sortings

Plegma

bitmasks, combinatorics, communication, interactive

Diadrash (Hard Version)

binary search, interactive, math, sortings

Diadrash (Easy Version)

binary search, brute force, divide and conquer, implementation, interactive

Monopati

brute force, combinatorics, dp, math, two pointers

Siga ta Kymata

constructive algorithms, greedy, implementation, math

Souvlaki VS. Kalamaki

brute force, greedy, math, sortings

Beautiful Problem

dp

Beautiful Tree

constructive algorithms, math, probabilities, trees

Beautiful Intervals

constructive algorithms, greedy

Beautiful Palindromes

constructive algorithms, greedy, schedules

Beautiful Permutation

binary search, interactive

Beautiful XOR

bitmasks, constructive algorithms, greedy

Beautiful String

brute force, constructive algorithms

Beautiful Average

brute force, greedy

Cycle Sort

data structures

Bitwise And Equals

bitmasks, greedy

SubMST

combinatorics, graphs, trees

Left is Always Right

combinatorics, implementation, math

Locked Out

binary search, data structures, dp, greedy

Loyalty

constructive algorithms, greedy, sortings, two pointers

Make Connected

brute force, implementation

Round Trip

games, greedy, implementation, math

Reverse XOR

bitmasks

Distinct Elements

greedy, math

MEX Partition

math

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

Annoying Game

dp, games, greedy

Split

constructive algorithms, greedy, math

Suspension

constructive algorithms, greedy, math

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

Meximum Array 2

constructive algorithms, greedy, implementation, math

Expansion Plan 2

implementation, math

Dungeon Equilibrium

greedy, implementation, sortings

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

Maximum GCD on Whiteboard

greedy, math, number theory

Strange Machine

binary search, brute force, greedy, implementation

Pizza Time

brute force, constructive algorithms, greedy

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

Abraham's Great Escape

constructive algorithms, graphs

El fucho

implementation, math

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

No Cost Too Great (Easy Version)

greedy, implementation, math, number theory

Make it Zigzag

constructive algorithms, greedy

Notelock

greedy, two pointers