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→ Filter Problems
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flows
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
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interactive
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Problems
#
Name
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x115
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1355
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x111
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x85
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16097
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x817
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x376
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3479
1766F
MCF
flows
2800
x227
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x612
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1583
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x86
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1292
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x345
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x333
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x477
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x500
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x13682
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x524
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x263
1666K
Kingdom Partition
flows
3200
x154
1662J
Training Camp
flows
,
graphs
x114
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x439
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x23055
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x280
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x522
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x391
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23145
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x43
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x8653
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x303
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x8921
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x337
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x379
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x669
1488I
Demonic Invasion
*special problem
,
flows
3100
x28
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2681
1473F
Strange Set
flows
,
math
2700
x841
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1388
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x9773
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x9702
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x564
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x206
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x6996
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1686
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x235
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x313
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1003
1383F
Special Edges
flows
,
graphs
3200
x229
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x287
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x954
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x387
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x404
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x661
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x804
1252L
Road Construction
flows
,
graphs
2300
x546
1250K
Projectors
flows
,
graphs
3100
x129
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4787
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x869
1187G
Gang Up
flows
,
graphs
2500
x460
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x159
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x515
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x153
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x745
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1471
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x9247
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x690
1090E
Horseback Riding
flows
,
graphs
2300
x552
1082G
Petya and Graph
flows
,
graphs
2400
x1782
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x511
1061E
Politics
flows
,
graphs
2600
x495
1054F
Electric Scheme
flows
,
graph matchings
2700
x297
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x298
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2049
1023G
Pisces
data structures
,
flows
,
trees
3400
x106
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4307
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x695
976F
Minimal k-covering
flows
,
graphs
2500
x531
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x2868
925F
Parametric Circulation
binary search
,
flows
3100
x89
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x469
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2605
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x805
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1433
863F
Almost Permutation
flows
2200
x1121
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x861
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x337
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x584
843E
Maximum Flow
flows
,
graphs
3000
x206
818G
Four Melodies
flows
,
graphs
2600
x567
813D
Two Melodies
dp
,
flows
2600
x910
808F
Card Game
binary search
,
flows
,
graphs
2400
x972
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x692
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x957
802C
Heidi and Library (hard)
flows
2600
x501
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x288
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x549
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x1878
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x171
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x1688
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