Easy Demon Problem

binary search, brute force, data structures, math, number theory

Insane Problem

binary search, greedy, implementation, math, number theory

Harder Problem

constructive algorithms, greedy, math

Hard Problem

greedy, math

Normal Problem

implementation, strings

Easy Problem

brute force, math

Problem with Queries

brute force, data structures, implementation

Nim

bitmasks, brute force, combinatorics, dp, games, greedy, implementation, shortest paths

Matrix Transformation

bitmasks, brute force, data structures, dfs and similar, graphs, greedy, implementation

Problem about GCD

brute force, flows, math, number theory

Sums on Segments

binary search, brute force, data structures, dp, greedy, math

Digits

math, number theory

Coin Transformation

brute force, math

Two Subarrays

data structures, dp, implementation, matrices

Vertex Pairs

binary search, brute force, data structures, dfs and similar, divide and conquer, greedy, implementation, trees

Recommendations

data structures, implementation, sortings, two pointers

Competitive Fishing

greedy

Game with Colored Marbles

games, greedy

Greedy Monocarp

greedy, sortings

Railway Construction

Selection Sort

binary search, data structures, greedy, two pointers

Building Castle

Trophic Balance Species

binary search, brute force, dfs and similar, graphs

Bottle Arrangement

data structures, divide and conquer, dp, dsu, greedy

Auto Complete

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

Sheet Music

combinatorics, dp, math

Grid Game

Segmentation Folds

brute force, dfs and similar, number theory

Beautiful Array

constructive algorithms, math

Drunken Maze

brute force, dfs and similar, graphs, shortest paths

Cube

bitmasks, dfs and similar, dp

Bowling Frame

binary search, brute force, math

The Bento Box Adventure

implementation, sortings

Number of Cubes

combinatorics, dp, math, number theory

Control of Randomness

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

Non Prime Tree

brute force, constructive algorithms, dfs and similar, greedy, number theory, trees, two pointers

Ordered Permutations

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

Paint a Strip

constructive algorithms, greedy, math

Game of Division

games, math

Cool Swap Walk (Hard Version)

constructive algorithms, constructive algorithms, constructive algorithms, implementation, 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

Shohag Loves XOR (Easy Version)

bitmasks, brute force, math, number theory

Shohag Loves Strings

constructive algorithms, greedy, implementation, strings

Shohag Loves Mod

constructive algorithms, number theory

Fixing the Expression

implementation

Royal Flush

dp, implementation

Bridge Renovation

brute force, dp, greedy, math, two pointers

Grid Walk

brute force, dp, greedy, math, number theory

Waiting for...

greedy, implementation

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

DIY

data structures, geometry, greedy, sortings

Make It Equal

binary search, brute force, greedy, math

Bonus Project

games, greedy

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

Sharky Surfing

data structures, greedy, two pointers

Superultra's Favorite Permutation

constructive algorithms, greedy, math, number theory

Intercepted Inputs

brute force, implementation

Twice

implementation

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

I Love 1543

brute force, implementation, matrices

Anya and 1100

brute force, implementation

Startup

greedy, sortings

Quintomania

implementation

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

Alya and Permutation

bitmasks, constructive algorithms, math

Everyone Loves Tres

constructive algorithms, greedy, math, number theory

Sliding

implementation, math

Rayan vs. Rayaneh

brute force, dfs and similar, dp, number theory

Simurgh's Watch (Hard Version)

greedy, implementation

Simurgh's Watch (Easy Version)

constructive algorithms, greedy, implementation, sortings

Khayyam's Royal Decree (Hard Version)

combinatorics, dp, math, sortings

Khayyam's Royal Decree (Easy Version)

combinatorics, dp, math, sortings

Permutations Harmony

combinatorics, constructive algorithms, greedy, hashing, math

Darius' Wisdom

constructive algorithms, greedy, implementation, sortings

Trapped in the Witch's Labyrinth

constructive algorithms, dfs and similar, graphs, implementation

Rakhsh's Revival

data structures, greedy, implementation, two pointers

King Keykhosrow's Mystery

brute force, chinese remainder theorem, math, number theory

Sakurako and Chefir

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

Kosuke's Sloth

brute force, math, number theory

Sakurako, Kosuke, and the Permutation

brute force, data structures, dfs and similar, dsu, graphs, greedy, math