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Before contest
Codeforces Round #794 (Div. 1)
37:52:57
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*has extra registration
Before contest
Codeforces Round #794 (Div. 2)
37:52:56
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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
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number theory
probabilities
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ternary search
trees
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Problems
#
Name
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x256
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
x76
1666K
Kingdom Partition
flows
3200
x61
1662J
Training Camp
flows
,
graphs
x33
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x191
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x18581
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x172
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x301
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x243
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x19773
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x35
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x7253
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x223
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x7171
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x185
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x240
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x539
1488I
Demonic Invasion
*special problem
,
flows
3100
x22
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2295
1473F
Strange Set
flows
,
math
2700
x673
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1232
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x8358
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x8186
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x418
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x137
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x6087
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1473
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x161
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x176
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x683
1383F
Special Edges
flows
,
graphs
3200
x154
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x166
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x823
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x280
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x308
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x419
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x678
1252L
Road Construction
flows
,
graphs
2300
x478
1250K
Projectors
flows
,
graphs
3100
x81
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4314
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x719
1187G
Gang Up
flows
,
graphs
2500
x365
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x142
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x474
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x100
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x564
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1153
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x8426
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x567
1090E
Horseback Riding
flows
,
graphs
2300
x436
1082G
Petya and Graph
flows
,
graphs
2400
x1291
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x434
1061E
Politics
flows
,
graphs
2600
x396
1054F
Electric Scheme
flows
,
graph matchings
2700
x264
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x241
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x1860
1023G
Pisces
data structures
,
flows
,
trees
3400
x72
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x3936
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x576
976F
Minimal k-covering
flows
,
graphs
2500
x443
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x2513
925F
Parametric Circulation
binary search
,
flows
3100
x72
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x360
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2125
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x649
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x986
863F
Almost Permutation
flows
2200
x935
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x714
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x240
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x512
843E
Maximum Flow
flows
,
graphs
3000
x114
818G
Four Melodies
flows
,
graphs
2600
x423
813D
Two Melodies
dp
,
flows
2600
x709
808F
Card Game
binary search
,
flows
,
graphs
2400
x679
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x325
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x615
802C
Heidi and Library (hard)
flows
2600
x362
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x211
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x379
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x1352
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x153
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x1238
727D
T-shirts Distribution
constructive algorithms
,
flows
,
greedy
1800
x1605
724E
Goods transportation
dp
,
flows
,
greedy
2900
x884
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1564
720B
Cactusophobia
dfs and similar
,
flows
2400
x295
717G
Underfail
flows
2400
x514
708D
Incorrect Flow
flows
2900
x494
704D
Captain America
flows
,
greedy
3100
x466
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x1833
628F
Bear and Fair Set
flows
,
graphs
2500
x542
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x409
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x2802
513F2
Scaygerboss
flows
2800
x219
513F1
Scaygerboss
flows
2700
x215
510E
Fox And Dinner
flows
2300
x1793
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x2679
491C
Deciphering
flows
,
graph matchings
2300
x310
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x63
434D
Nanami's Power Plant
flows
2900
x315
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