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Before contest
Codeforces Round #850 (Div. 1, based on VK Cup 2022 - Final Round)
23:15:00
Register now »
*has extra registration
Before contest
Codeforces Round #850 (Div. 2, based on VK Cup 2022 - Final Round)
23:15:00
Register now »
*has extra registration
→ Filter Problems
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flows
combine-tags-by-or
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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
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number theory
probabilities
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shortest paths
sortings
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ternary search
trees
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Problems
#
Name
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x570
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x250
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x2907
1766F
MCF
flows
2800
x155
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x473
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1243
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x67
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1069
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x218
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x273
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x402
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x445
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x12246
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x446
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x223
1666K
Kingdom Partition
flows
3200
x89
1662J
Training Camp
flows
,
graphs
x50
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x301
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x20953
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x209
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x370
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x283
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x21378
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x39
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x7995
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x238
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x7859
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x214
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x328
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x598
1488I
Demonic Invasion
*special problem
,
flows
3100
x23
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2494
1473F
Strange Set
flows
,
math
2700
x740
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1310
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x9036
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x8883
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x477
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x155
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x6541
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1578
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x188
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x225
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x836
1383F
Special Edges
flows
,
graphs
3200
x165
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x206
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x878
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x350
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x344
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x511
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x725
1252L
Road Construction
flows
,
graphs
2300
x511
1250K
Projectors
flows
,
graphs
3100
x88
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4543
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x793
1187G
Gang Up
flows
,
graphs
2500
x404
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x148
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x487
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x123
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x645
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1261
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x8818
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x628
1090E
Horseback Riding
flows
,
graphs
2300
x506
1082G
Petya and Graph
flows
,
graphs
2400
x1515
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x488
1061E
Politics
flows
,
graphs
2600
x437
1054F
Electric Scheme
flows
,
graph matchings
2700
x275
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x257
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x1955
1023G
Pisces
data structures
,
flows
,
trees
3400
x75
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4149
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x636
976F
Minimal k-covering
flows
,
graphs
2500
x499
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x2681
925F
Parametric Circulation
binary search
,
flows
3100
x77
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x404
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2381
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x726
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1175
863F
Almost Permutation
flows
2200
x1017
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x773
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x281
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x553
843E
Maximum Flow
flows
,
graphs
3000
x130
818G
Four Melodies
flows
,
graphs
2600
x475
813D
Two Melodies
dp
,
flows
2600
x792
808F
Card Game
binary search
,
flows
,
graphs
2400
x811
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x485
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x767
802C
Heidi and Library (hard)
flows
2600
x433
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x234
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x449
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x1584
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x159
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x1445
727D
T-shirts Distribution
constructive algorithms
,
flows
,
greedy
1800
x1668
724E
Goods transportation
dp
,
flows
,
greedy
2900
x1023
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1693
720B
Cactusophobia
dfs and similar
,
flows
2400
x329
717G
Underfail
flows
2400
x554
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