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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
29:05:18
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Difficulty:
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flows
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
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x30
1488I
Demonic Invasion
*special problem
,
flows
3100
x33
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x47
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x53
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x80
126E
Pills
brute force
,
flows
2900
x81
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
925F
Parametric Circulation
binary search
,
flows
3100
x94
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x95
1023G
Pisces
data structures
,
flows
,
trees
3400
x111
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x144
1250K
Projectors
flows
,
graphs
3100
x149
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x165
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x167
1666K
Kingdom Partition
flows
3200
x177
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x177
212A
Privatization
flows
,
graphs
3000
x185
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x186
1662J
Training Camp
flows
,
graphs
x190
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x205
62E
World Evil
dp
,
flows
2700
x215
1766F
MCF
flows
2800
x254
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x255
843E
Maximum Flow
flows
,
graphs
3000
x278
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x284
513F1
Scaygerboss
flows
2700
x294
1054F
Electric Scheme
flows
,
graph matchings
2700
x303
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x306
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x311
513F2
Scaygerboss
flows
2800
x311
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x313
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x315
1383F
Special Edges
flows
,
graphs
3200
x316
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x326
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x347
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x357
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x358
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x360
491C
Deciphering
flows
,
graph matchings
2300
x379
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x380
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x386
720B
Cactusophobia
dfs and similar
,
flows
2400
x388
434D
Nanami's Power Plant
flows
2900
x394
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x410
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x416
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x440
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x459
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x469
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x486
1187G
Gang Up
flows
,
graphs
2500
x497
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x505
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x506
1061E
Politics
flows
,
graphs
2600
x507
132E
Bits of merry old England
flows
,
graphs
2700
x520
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x524
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x525
802C
Heidi and Library (hard)
flows
2600
x526
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x531
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x536
316C1
Tidying Up
flows
2200
x545
976F
Minimal k-covering
flows
,
graphs
2500
x550
1252L
Road Construction
flows
,
graphs
2300
x566
1090E
Horseback Riding
flows
,
graphs
2300
x572
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x575
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x575
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x598
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x607
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x609
316C2
Tidying Up
flows
,
graph matchings
2300
x613
818G
Four Melodies
flows
,
graphs
2600
x616
717G
Underfail
flows
2400
x618
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x657
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x661
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x668
708D
Incorrect Flow
flows
2900
x686
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x699
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x716
628F
Bear and Fair Set
flows
,
graphs
2500
x725
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x726
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x740
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x764
704D
Captain America
flows
,
greedy
3100
x773
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x789
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x792
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x812
103E
Buying Sets
flows
,
graph matchings
2900
x812
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x831
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x837
164C
Machine Programming
flows
,
graphs
2400
x872
1913E
Matrix Problem
flows
,
graphs
2400
x884
1473F
Strange Set
flows
,
math
2700
x889
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x892
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x929
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x942
813D
Two Melodies
dp
,
flows
2600
x958
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x968
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x971
311E
Biologist
flows
2300
x1035
808F
Card Game
binary search
,
flows
,
graphs
2400
x1064
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1085
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