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Codeforces Global Round 13
27:08:30
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*has extra registration
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Difficulty:
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graphs
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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Custom test
Problems
#
Name
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x30
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x63
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x90
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x93
1338E
JYPnation
graphs
3500
x97
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x269
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x33
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x64
1239F
Swiper, no swiping!
graphs
,
implementation
3400
x85
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x98
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x120
1010F
Tree
fft
,
graphs
,
trees
3400
x121
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x177
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x194
843D
Dynamic Shortest Path
graphs
,
shortest paths
3400
x309
737E
Tanya is 5!
graph matchings
,
graphs
,
greedy
,
schedules
3300
x50
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x59
1284G
Seollal
graphs
3300
x65
1392I
Kevin and Grid
fft
,
graphs
,
math
3300
x67
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x72
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x75
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x135
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x140
718E
Matvey's Birthday
bitmasks
,
graphs
3300
x185
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x223
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x232
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x40
730K
Roads Orientation Problem
graphs
3200
x62
1242E
Planar Perimeter
constructive algorithms
,
graphs
3200
x63
1383F
Special Edges
flows
,
graphs
3200
x92
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x118
1089B
Bimatching
graphs
3200
x133
827F
Dirty Arkady's Kitchen
data structures
,
dp
,
graphs
,
shortest paths
3200
x136
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x155
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x157
1142E
Pink Floyd
graphs
,
interactive
3200
x159
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x169
1149E
Election Promises
games
,
graphs
3200
x174
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x287
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x300
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x346
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x794
1089D
Distance Sum
graphs
3100
x58
1250K
Projectors
flows
,
graphs
3100
x69
1240F
Football
graphs
3100
x81
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x128
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x199
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x264
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x303
521E
Cycling City
dfs and similar
,
graphs
3100
x436
1211I
Unusual Graph
*special problem
,
graphs
3000
x20
1218G
Alpha planetary system
constructive algorithms
,
graphs
,
shortest paths
3000
x21
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x38
223D
Spider
geometry
,
graphs
3000
x41
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x48
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x74
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x85
843E
Maximum Flow
flows
,
graphs
3000
x86
212A
Privatization
flows
,
graphs
3000
x100
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x115
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x136
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x233
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x234
1163F
Indecisive Taxi Fee
data structures
,
graphs
,
shortest paths
3000
x236
235D
Graph Game
graphs
3000
x279
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x289
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x327
429E
Points and Segments
graphs
3000
x447
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x487
1019C
Sergey's problem
constructive algorithms
,
graphs
3000
x654
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x75
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x77
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x79
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x85
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x141
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x146
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x198
687E
TOF
dfs and similar
,
graphs
2900
x230
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x241
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x265
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x281
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x303
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x311
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x327
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x339
1218A
BubbleReactor
dp
,
graphs
2800
x55
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x79
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x123
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x148
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x183
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x191
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x207
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x210
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x226
819E
Mister B and Flight to the Moon
constructive algorithms
,
graphs
2800
x248
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x249
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x252
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x256
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x282
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x305
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