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Codeforces Round sponsored by NEAR (Div. 1 + Div. 2)
31:06:35
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2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x18338
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x6069
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12279
1807D
Odd Queries
data structures
,
implementation
900
x30390
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29779
1807B
Grab the Candies
greedy
800
x40777
1807A
Plus or Minus
implementation
800
x58601
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x285
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x345
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2742
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x868
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7415
1806B
Mex Master
constructive algorithms
,
greedy
900
x17369
1806A
Walking Master
geometry
,
greedy
,
math
800
x23343
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x335
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x855
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1560
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6301
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12276
1805B
The String Has a Target
greedy
,
strings
800
x18376
1805A
We Need the Zero
bitmasks
,
brute force
800
x22112
1804H
Code Lock
bitmasks
,
dp
3300
x173
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x194
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x886
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1391
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4515
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11807
1804B
Vaccination
greedy
,
implementation
1000
x13997
1804A
Lame King
greedy
,
math
800
x17798
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x13111
1802A
Likes
greedy
,
implementation
800
x15639
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x357
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x556
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x438
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2114
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3330
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x6025
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8350
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1979
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3783
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12398
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12455
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x22463
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21880
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22884
1800B
Count the Number of Pairs
greedy
,
strings
1000
x24491
1800A
Is It a Cat?
implementation
,
strings
800
x30691
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x275
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x724
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x782
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1173
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2372
1799D1
Hot Start Up (easy version)
dp
1900
x4273
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5665
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x11047
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11466
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x477
1798E
Multitest Generator
brute force
,
dp
2300
x1551
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9476
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7985
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x16242
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19508
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x340
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1230
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3838
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7425
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x15276
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17175
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x170
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x722
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4119
1796C
Maximum Set
binary search
,
math
1600
x10090
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16288
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18689
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x663
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1084
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1966
1795D
Triangle Coloring
combinatorics
,
math
1600
x8809
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11909
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21674
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23434
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1041
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3468
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x13093
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x20852
1794A
Prefix and Suffix Array
strings
800
x16910
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1330
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x956
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5941
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x19111
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15536
1793A
Yet Another Promotion
greedy
,
math
800
x17859
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x376
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x689
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1337
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x6046
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13685
1792B
Stand-up Comedian
greedy
,
math
1200
x20750
1792A
GamingForces
greedy
,
sortings
800
x27654
1791G2
Teleporters (Hard Version)
binary search
,
greedy
,
sortings
1900
x4629
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