Sept. 19, 2020

Sage's Birthday (easy version)

binary search
sortings
greedy
constructive algorithms

Sept. 19, 2020

Sage's Birthday (hard version)

binary search
sortings
greedy
two pointers
brute force
constructive algorithms

Sept. 14, 2020

Negative Prefixes

greedy
sortings

Sept. 12, 2020

Maximum Product

greedy
sortings
implementation
brute force
dp

Sept. 6, 2020

Fixed Point Removal

data structures
sortings
binary search

Sept. 4, 2020

Two Platforms

two pointers
dp
sortings
binary search

Aug. 30, 2020

Rainbow Rectangles

data structures
two pointers
sortings

Aug. 30, 2020

Power Sequence

brute force
math
number theory
sortings

Aug. 28, 2020

The Potion of Great Power

*special
binary search
data structures
graphs
interactive
sortings
two pointers
2sat

Aug. 26, 2020

Fancy Fence

*special
data structures
dsu
math
sortings
implementation

Aug. 26, 2020

Roads

*special
geometry
sortings

Aug. 21, 2020

Katastrophic sort

sortings

Aug. 21, 2020

Mere Array

constructive algorithms
math
number theory
sortings

Aug. 21, 2020

Maximum Distributed Tree

greedy
number theory
sortings
trees
dfs and similar
dp
implementation
math

Aug. 21, 2020

Divide Square

data structures
geometry
implementation
sortings

Aug. 14, 2020

Substring Removal Game

greedy
games
sortings

Aug. 14, 2020

Colored Rectangles

dp
greedy
sortings

Aug. 14, 2020

Two Types of Spells

data structures
greedy
math
binary search
implementation
sortings

Aug. 12, 2020

Boboniu Chats with Du

dp
greedy
two pointers
sortings

Aug. 12, 2020

Boboniu and Jianghu

dp
sortings
trees
greedy

Aug. 12, 2020

Boboniu Chats with Du

dp
greedy
brute force
sortings

Aug. 7, 2020

Pinkie Pie Eats Pattycakes

greedy
sortings
constructive algorithms
math

Aug. 5, 2020

Remove Smallest

greedy
sortings

Aug. 5, 2020

Weights Division (hard version)

dfs and similar
greedy
trees
two pointers
binary search
sortings

Aug. 5, 2020

Yet Another Segments Subset

dp
sortings
data structures
graphs

July 30, 2020

Uncle Bogdan and Projections

geometry
sortings
data structures

July 29, 2020

Bicolored Segments

data structures
dp
graph matchings
sortings

July 24, 2020

String Transformation 1

graphs
trees
greedy
dsu
sortings
strings
two pointers

July 24, 2020

Rearrange

constructive algorithms
greedy
graphs
sortings
brute force

July 24, 2020

String Transformation 1

graphs
trees
dfs and similar
dsu
sortings
greedy

July 22, 2020

Mixture

*special
data structures
geometry
math
sortings

July 21, 2020

Mastermind

constructive algorithms
greedy
implementation
sortings
graph matchings
two pointers

July 21, 2020

Origami

geometry
math
sortings

July 21, 2020

Mastermind

constructive algorithms
greedy
implementation
sortings

July 19, 2020

Choosing flowers

sortings
binary search
greedy
two pointers
brute force
data structures
dfs and similar
dp

July 19, 2020

New Passenger Trams

sortings
brute force
data structures
two pointers
binary search

July 12, 2020

C. Create The Teams

dp
greedy
sortings
brute force
implementation

July 4, 2020

D. Replace by MEX

constructive algorithms
brute force
sortings

July 4, 2020

E. Inversion SwapSort

constructive algorithms
greedy
sortings

July 1, 2020

E1. Asterism (Easy Version)

combinatorics
number theory
sortings
math
binary search
brute force

July 1, 2020

E2. Asterism (Hard Version)

number theory
sortings
binary search
math
combinatorics
dp

June 28, 2020

D. Zero Remainder Array

math
sortings
two pointers

June 28, 2020

E1. Reading Books (easy version)

greedy
sortings
data structures

June 28, 2020

E2. Reading Books (hard version)

greedy
sortings
data structures
two pointers
implementation
ternary search

June 28, 2020

F. Cyclic Shifts Sorting

constructive algorithms
brute force
implementation
sortings

June 26, 2020

D. Distributed Computing

sortings

June 23, 2020

C. RationalLee

greedy
math
sortings
two pointers

June 23, 2020

E. DeadLee

data structures
greedy
implementation
sortings
dfs and similar

May 17, 2020

F. Summoning Minions

sortings

May 16, 2020

B. Young Explorers

sortings

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