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Codeforces Round (Div. 3)
4 days
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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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Problems
#
Name
1806A
Walking Master
geometry
,
greedy
,
math
800
x23216
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
x850
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1555
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6269
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12248
1805B
The String Has a Target
greedy
,
strings
800
x18348
1805A
We Need the Zero
bitmasks
,
brute force
800
x21990
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
x1386
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4499
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11775
1804B
Vaccination
greedy
,
implementation
1000
x13965
1804A
Lame King
greedy
,
math
800
x17782
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x13080
1802A
Likes
greedy
,
implementation
800
x15619
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
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
x2106
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3319
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5996
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8318
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1973
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3773
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12352
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12400
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x22325
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21802
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22806
1800B
Count the Number of Pairs
greedy
,
strings
1000
x24405
1800A
Is It a Cat?
implementation
,
strings
800
x30536
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x275
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x721
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
x1172
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2334
1799D1
Hot Start Up (easy version)
dp
1900
x4242
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5645
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x11021
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11450
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x475
1798E
Multitest Generator
brute force
,
dp
2300
x1545
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9422
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7953
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x16203
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19488
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x338
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1222
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3825
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7396
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x15161
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17130
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x170
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x720
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4103
1796C
Maximum Set
binary search
,
math
1600
x10057
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16224
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18670
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x660
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1080
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1958
1795D
Triangle Coloring
combinatorics
,
math
1600
x8775
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11863
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21553
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23416
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1036
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3451
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12995
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x20679
1794A
Prefix and Suffix Array
strings
800
x16856
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1324
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x951
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5923
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18977
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15498
1793A
Yet Another Promotion
greedy
,
math
800
x17836
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
x682
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1331
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x6020
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13640
1792B
Stand-up Comedian
greedy
,
math
1200
x20675
1792A
GamingForces
greedy
,
sortings
800
x27607
1791G2
Teleporters (Hard Version)
binary search
,
greedy
,
sortings
1900
x4606
1791G1
Teleporters (Easy Version)
greedy
,
sortings
1100
x21415
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11860
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x26673
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x28220
1791C
Prepend and Append
implementation
,
two pointers
800
x42385
1791B
Following Directions
geometry
,
implementation
800
x42831
1791A
Codeforces Checking
implementation
,
strings
800
x57283
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1087
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3209
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14579
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18961
1790C
Premutation
brute force
,
implementation
,
math
1000
x23342
1790B
Taisia and Dice
greedy
,
greedy
,
math
800
x26952
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