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Problems
#
Name
1965F
Conference
data structures
,
flows
3300
x75
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1034
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x45
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x62
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2980
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x742
1913E
Matrix Problem
flows
,
graphs
2400
x911
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x173
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1526
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x147
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x99
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16959
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x967
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x426
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3679
1766F
MCF
flows
2800
x257
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x667
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1738
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1425
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x409
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x366
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x511
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x535
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x14459
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x580
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x286
1666K
Kingdom Partition
flows
3200
x185
1662J
Training Camp
flows
,
graphs
x200
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x508
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x24071
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x308
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x663
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x471
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23833
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x48
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x8901
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x317
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x9399
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x388
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x413
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x716
1488I
Demonic Invasion
*special problem
,
flows
3100
x33
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2800
1473F
Strange Set
flows
,
math
2700
x916
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1436
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x10188
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10132
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x626
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x258
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7232
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1772
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x373
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x352
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1095
1383F
Special Edges
flows
,
graphs
3200
x321
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x330
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x982
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x479
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x445
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x749
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x841
1252L
Road Construction
flows
,
graphs
2300
x567
1250K
Projectors
flows
,
graphs
3100
x154
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4948
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x1152
1187G
Gang Up
flows
,
graphs
2500
x499
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x166
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x566
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x218
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x794
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1665
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x9867
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x725
1090E
Horseback Riding
flows
,
graphs
2300
x573
1082G
Petya and Graph
flows
,
graphs
2400
x1947
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x532
1061E
Politics
flows
,
graphs
2600
x511
1054F
Electric Scheme
flows
,
graph matchings
2700
x306
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x321
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2075
1023G
Pisces
data structures
,
flows
,
trees
3400
x113
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4432
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x770
976F
Minimal k-covering
flows
,
graphs
2500
x561
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x3014
925F
Parametric Circulation
binary search
,
flows
3100
x94
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x509
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2741
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x936
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1633
863F
Almost Permutation
flows
2200
x1188
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x955
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x365
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x615
843E
Maximum Flow
flows
,
graphs
3000
x282
818G
Four Melodies
flows
,
graphs
2600
x628
813D
Two Melodies
dp
,
flows
2600
x967
808F
Card Game
binary search
,
flows
,
graphs
2400
x1095
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x828
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