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Before contest
Codeforces Round 941 (Div. 1)
4 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
4 days
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dfs and similar
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Name
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x54
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x97
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x206
1023G
Pisces
data structures
,
flows
,
trees
3400
x112
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x312
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x489
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x256
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x327
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x348
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x360
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x411
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x36
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x146
1666K
Kingdom Partition
flows
3200
x178
1383F
Special Edges
flows
,
graphs
3200
x318
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x383
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x576
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x599
1488I
Demonic Invasion
*special problem
,
flows
3100
x33
925F
Parametric Circulation
binary search
,
flows
3100
x94
1250K
Projectors
flows
,
graphs
3100
x150
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x168
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x387
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x471
704D
Captain America
flows
,
greedy
3100
x774
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x81
212A
Privatization
flows
,
graphs
3000
x186
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x187
843E
Maximum Flow
flows
,
graphs
3000
x279
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x307
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2043
126E
Pills
brute force
,
flows
2900
x82
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x180
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x362
434D
Nanami's Power Plant
flows
2900
x395
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x441
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x670
708D
Incorrect Flow
flows
2900
x688
103E
Buying Sets
flows
,
graph matchings
2900
x813
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x814
724E
Goods transportation
dp
,
flows
,
greedy
2900
x1222
1766F
MCF
flows
2800
x255
513F2
Scaygerboss
flows
2800
x312
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x316
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x359
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x460
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x576
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x662
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x728
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1088
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1179
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x166
62E
World Evil
dp
,
flows
2700
x216
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x285
513F1
Scaygerboss
flows
2700
x295
1054F
Electric Scheme
flows
,
graph matchings
2700
x304
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x507
132E
Bits of merry old England
flows
,
graphs
2700
x521
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x742
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x790
1473F
Strange Set
flows
,
math
2700
x901
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x416
1061E
Politics
flows
,
graphs
2600
x508
802C
Heidi and Library (hard)
flows
2600
x528
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x617
818G
Four Melodies
flows
,
graphs
2600
x622
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x700
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x718
813D
Two Melodies
dp
,
flows
2600
x963
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x315
1187G
Gang Up
flows
,
graphs
2500
x498
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x507
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x527
976F
Minimal k-covering
flows
,
graphs
2500
x560
628F
Bear and Fair Set
flows
,
graphs
2500
x728
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x896
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x932
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x969
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x972
720B
Cactusophobia
dfs and similar
,
flows
2400
x390
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x532
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x612
717G
Underfail
flows
2400
x619
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x658
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x767
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x832
164C
Machine Programming
flows
,
graphs
2400
x874
1913E
Matrix Problem
flows
,
graphs
2400
x887
808F
Card Game
binary search
,
flows
,
graphs
2400
x1066
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1088
277E
Binary Tree on Plane
flows
,
trees
2400
x1231
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1424
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1637
1082G
Petya and Graph
flows
,
graphs
2400
x1918
491C
Deciphering
flows
,
graph matchings
2300
x380
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x525
1252L
Road Construction
flows
,
graphs
2300
x566
1090E
Horseback Riding
flows
,
graphs
2300
x573
316C2
Tidying Up
flows
,
graph matchings
2300
x614
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