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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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
schedules
shortest paths
sortings
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ternary search
trees
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Problems
#
Name
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23703
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16866
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x23918
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x9756
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x14388
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x8868
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10060
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x9332
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7210
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4417
727D
T-shirts Distribution
constructive algorithms
,
flows
,
greedy
1800
x1793
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4923
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x2956
321B
Ciel and Duel
dp
,
flows
,
greedy
1900
x2945
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2851
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1758
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x10129
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3645
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2724
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x1927
237E
Build String
flows
,
graphs
2000
x1581
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3433
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x3268
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1589
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1491
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x942
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2780
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2301
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2070
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1880
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1402
863F
Almost Permutation
flows
2200
x1178
316C1
Tidying Up
flows
2200
x545
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x536
510E
Fox And Dinner
flows
2300
x2136
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1694
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1591
311E
Biologist
flows
2300
x1035
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x817
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x792
316C2
Tidying Up
flows
,
graph matchings
2300
x613
1090E
Horseback Riding
flows
,
graphs
2300
x572
1252L
Road Construction
flows
,
graphs
2300
x564
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x524
491C
Deciphering
flows
,
graph matchings
2300
x379
1082G
Petya and Graph
flows
,
graphs
2400
x1913
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1633
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1421
277E
Binary Tree on Plane
flows
,
trees
2400
x1225
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1078
808F
Card Game
binary search
,
flows
,
graphs
2400
x1058
1913E
Matrix Problem
flows
,
graphs
2400
x884
164C
Machine Programming
flows
,
graphs
2400
x871
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x831
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x764
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x657
717G
Underfail
flows
2400
x618
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x604
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x531
720B
Cactusophobia
dfs and similar
,
flows
2400
x388
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x971
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x967
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x923
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x890
628F
Bear and Fair Set
flows
,
graphs
2500
x723
976F
Minimal k-covering
flows
,
graphs
2500
x550
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x522
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x501
1187G
Gang Up
flows
,
graphs
2500
x496
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x313
813D
Two Melodies
dp
,
flows
2600
x948
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x716
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x699
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x607
818G
Four Melodies
flows
,
graphs
2600
x606
802C
Heidi and Library (hard)
flows
2600
x525
1061E
Politics
flows
,
graphs
2600
x507
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x416
1473F
Strange Set
flows
,
math
2700
x889
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x788
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x739
132E
Bits of merry old England
flows
,
graphs
2700
x520
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x506
1054F
Electric Scheme
flows
,
graph matchings
2700
x303
513F1
Scaygerboss
flows
2700
x293
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x283
62E
World Evil
dp
,
flows
2700
x215
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x165
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1159
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1082
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x726
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x661
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x575
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x459
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x357
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x315
513F2
Scaygerboss
flows
2800
x310
1766F
MCF
flows
2800
x254
724E
Goods transportation
dp
,
flows
,
greedy
2900
x1215
103E
Buying Sets
flows
,
graph matchings
2900
x812
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