Railway Construction

Selection Sort

binary search, data structures, greedy, two pointers

Building Castle

Trophic Balance Species

Bottle Arrangement

dsu, greedy

Auto Complete

data structures, hashing, implementation, sortings, strings, trees

Sheet Music

combinatorics, dp, math

Grid Game

Segmentation Folds

brute force, dfs and similar, number theory

Drunken Maze

brute force, dfs and similar, graphs, shortest paths

Cube

bitmasks, dp

Cool Swap Walk (Hard Version)

constructive algorithms, constructive algorithms, constructive algorithms, implementation, implementation, sortings, sortings

Cool Swap Walk (Easy Version)

constructive algorithms, implementation, sortings

Shohag Loves Pebae

math, number theory

Shohag Loves Counting (Hard Version)

dp, number theory

Shohag Loves Counting (Easy Version)

combinatorics, dp, math, number theory

Shohag Loves Inversions

combinatorics, dp, implementation, math

Shohag Loves GCD

constructive algorithms, greedy, math, number theory

Shohag Loves XOR (Hard Version)

bitmasks, brute force, math, number theory

Royal Flush

dp, implementation

Grid Walk

brute force, dp, greedy, math, number theory

Polyathlon

binary search, data structures, hashing, string suffix structures, strings

Galactic Council

flows

Guess One Character

constructive algorithms, implementation, interactive

Alternative Platforms

combinatorics, data structures, fft, math, sortings

Barrels

data structures, greedy, math

Divide OR Conquer

binary search, bitmasks, data structures, dp, implementation

Make It Equal

binary search, brute force, greedy, math

Natlan Exploring

bitmasks, combinatorics, data structures, dp, math, number theory

Ardent Flames

binary search, data structures, math, sortings, two pointers

Kachina's Favorite Binary String

dp, greedy, interactive, two pointers

Library of Magic

binary search, constructive algorithms, divide and conquer, interactive, math, number theory

XORificator 3000

bitmasks, dp, number theory, two pointers

Reverse the Rivers

binary search, constructive algorithms, data structures, greedy

Peak Productivity Forces

constructive algorithms

Go Learn! (Hard Version)

divide and conquer, dp

Go Learn! (Easy Version)

dp, trees

Tree Operations

binary search, brute force, dfs and similar, dp, trees

Monster

binary search, brute force, constructive algorithms, greedy, implementation, math, ternary search

Yet Another Real Number Problem

binary search, data structures, divide and conquer, greedy, implementation, math

Sakurako and Chefir

data structures, dfs and similar, dp, greedy, trees

Kosuke's Sloth

brute force, math, number theory

Peanuts

combinatorics, dp, games, math

Balanced

constructive algorithms, data structures, greedy, implementation, math

Genokraken

constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers

Penchick and Even Medians

binary search, constructive algorithms, interactive, probabilities

Penchick and Chloe's Trees

data structures, dfs and similar, dp, greedy, implementation, math, sortings, trees

Penchick and Desert Rabbit

binary search, data structures, dfs and similar, dp, dsu, greedy, implementation, two pointers

The Destruction of the Universe (Hard Version)

combinatorics, math

The Destruction of the Universe (Easy Version)

combinatorics, greedy, math

Orangutan Approved Subarrays

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

MEXimize the Score

combinatorics, data structures, dp, greedy, implementation, math

QED's Favorite Permutation

data structures, implementation, sortings

Variance Challenge

flows, graphs, greedy

Message Spread

bitmasks, brute force, combinatorics, dp

Balanced Problem

data structures, dp

Palindrome Everywhere

constructive algorithms, graphs, greedy

Common Generator

brute force, constructive algorithms, math, number theory

Cool Graph

constructive algorithms, data structures, dfs and similar, dsu, graphs, greedy, trees

New Rating

binary search, data structures, dp, greedy

Alice's Adventures in Addition

bitmasks, brute force, dp, implementation

Alice's Adventures in the Rabbit Hole

combinatorics, dfs and similar, dp, games, greedy, math, probabilities, trees

Alice's Adventures in Cards

constructive algorithms, data structures, dp, graphs, greedy, implementation, ternary search

Alice's Adventures in Cutting Cake

binary search, dp, greedy, two pointers

Bit Game (Hard Version)

bitmasks, dp, math

Bit Game (Easy Version)

bitmasks, brute force, games, math

The Endspeaker (Hard Version)

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

The Endspeaker (Easy Version)

binary search, dp, graphs, greedy, implementation, two pointers

Bermart Ice Cream

data structures, dfs and similar, divide and conquer, dp, implementation, trees

Best Subsequence

bitmasks, dfs and similar, flows, graph matchings, graphs

Sums of Segments

binary search, data structures, dp, implementation, math

Variable Damage

data structures, flows

Choose Your Queries

constructive algorithms, dfs and similar, dp, graphs, greedy, trees

Card Game

combinatorics, dp, fft, greedy, math

Attribute Checks

brute force, data structures, dp, implementation, math, two pointers

Hills and Pits

data structures, greedy, math, matrices

Tree of Life

dp, greedy, trees

Many Games

brute force, dp, greedy, math, probabilities

C+K+S

constructive algorithms, dfs and similar, graphs, greedy, hashing, implementation, strings

Skipping

binary search, dp, graphs, shortest paths

Billetes MX (Hard Version)

binary search, combinatorics, data structures, dsu, graphs

Billetes MX (Easy Version)

2-sat, binary search, combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Asesino (Hard Version)

constructive algorithms, dp, interactive

Asesino (Easy Version)

binary search, brute force, constructive algorithms, implementation, interactive

Gerrymandering

dp, implementation

Digital Village (Extreme Version)

data structures, dfs and similar, dp, dsu, graphs, greedy, math, trees

Digital Village (Hard Version)

data structures, dp, dsu, graphs, math, trees

Digital Village (Easy Version)

brute force, data structures, dfs and similar, dp, dsu, fft, graphs, greedy, implementation, math, trees

Boss, Thirsty

dp, greedy, implementation

Adjust The Presentation (Hard Version)

constructive algorithms, data structures, greedy, implementation, sortings

Count Leaves

dp, math, number theory

Expected Power

bitmasks, dp, math, probabilities

Connect the Dots

brute force, dp, dsu, graphs, math, trees

Speedbreaker Counting (Hard Version)

dp, greedy, math

Speedbreaker Counting (Medium Version)

dp, greedy, math

Speedbreaker Counting (Easy Version)

combinatorics, dp, greedy, math

Complex Segments (Hard Version)

binary search, data structures, divide and conquer, dsu, greedy, math, sortings

Complex Segments (Easy Version)

binary search, data structures, divide and conquer, dsu, greedy, math, sortings

Max Plus Min Plus Size

data structures, dp, dsu, greedy, implementation, matrices, sortings

Tree Pruning

brute force, dfs and similar, greedy, sortings, trees