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Codeforces Round (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
combine-tags-by-or
*combine tags by OR
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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Status
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Custom test
Problems
#
Name
1805A
We Need the Zero
bitmasks
,
brute force
800
x21867
1804H
Code Lock
bitmasks
,
dp
3300
x171
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x194
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x862
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1381
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4487
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11739
1804B
Vaccination
greedy
,
implementation
1000
x13943
1804A
Lame King
greedy
,
math
800
x17772
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x13055
1802A
Likes
greedy
,
implementation
800
x15604
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x356
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x554
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x437
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2096
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3299
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5970
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8282
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1972
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3767
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12316
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12366
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x22222
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21741
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22745
1800B
Count the Number of Pairs
greedy
,
strings
1000
x24347
1800A
Is It a Cat?
implementation
,
strings
800
x30464
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x275
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x716
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x780
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1171
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2328
1799D1
Hot Start Up (easy version)
dp
1900
x4223
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5618
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10994
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11439
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x474
1798E
Multitest Generator
brute force
,
dp
2300
x1542
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9379
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7935
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x16160
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19468
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x337
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1217
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3774
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7382
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x15080
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17108
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x170
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x718
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4074
1796C
Maximum Set
binary search
,
math
1600
x10026
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16201
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18656
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x660
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1077
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1952
1795D
Triangle Coloring
combinatorics
,
math
1600
x8740
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11818
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21515
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23398
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1033
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3434
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12916
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x20531
1794A
Prefix and Suffix Array
strings
800
x16826
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1321
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x950
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5899
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18851
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15465
1793A
Yet Another Promotion
greedy
,
math
800
x17825
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x375
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x680
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1330
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x6011
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13602
1792B
Stand-up Comedian
greedy
,
math
1200
x20617
1792A
GamingForces
greedy
,
sortings
800
x27561
1791G2
Teleporters (Hard Version)
binary search
,
greedy
,
sortings
1900
x4591
1791G1
Teleporters (Easy Version)
greedy
,
sortings
1100
x21308
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11825
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x26516
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x28056
1791C
Prepend and Append
implementation
,
two pointers
800
x42105
1791B
Following Directions
geometry
,
implementation
800
x42711
1791A
Codeforces Checking
implementation
,
strings
800
x57045
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1084
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3203
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14541
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18848
1790C
Premutation
brute force
,
implementation
,
math
1000
x23300
1790B
Taisia and Dice
greedy
,
greedy
,
math
800
x26926
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x36161
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x527
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x778
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1606
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8247
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15934
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x17645
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