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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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Difficulty:
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shortest paths
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
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x125998
3A
Shortest path of the king
greedy
,
shortest paths
1000
x18488
1759C
Thermostat
greedy
,
math
,
shortest paths
1100
x16921
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x14207
370A
Rook, Bishop and King
graphs
,
math
,
shortest paths
1100
x9824
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x24332
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x16897
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x13761
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x47627
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x13648
198B
Jumping on Walls
shortest paths
1400
x4064
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x18004
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x15159
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x13846
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13743
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12098
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6211
329B
Biridian Forest
dfs and similar
,
shortest paths
1500
x6048
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4448
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12267
601A
The Two Routes
graphs
,
shortest paths
1600
x11385
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10112
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6544
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x6505
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6278
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5584
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x4941
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4327
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2514
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16054
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13700
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x13031
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10374
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x10326
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x10280
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9225
1249E
By Elevator or Stairs?
dp
,
shortest paths
1700
x9188
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8112
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6902
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6473
1204C
Anna, Svyatoslav and Maps
dp
,
graphs
,
greedy
,
shortest paths
1700
x6422
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x5904
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5747
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4555
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4436
1202B
You Are Given a Decimal String...
brute force
,
dp
,
shortest paths
1700
x4351
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3481
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2094
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x7963
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x7402
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7284
1063B
Labyrinth
graphs
,
shortest paths
1800
x7023
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6222
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5720
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5320
1076D
Edge Deletion
graphs
,
greedy
,
shortest paths
1800
x4885
33B
String Problem
shortest paths
1800
x4045
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x3872
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x2830
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x2829
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2504
187B
AlgoRace
dp
,
shortest paths
1800
x1917
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1718
20C
Dijkstra?
graphs
,
shortest paths
1900
x29621
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6841
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6278
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x5964
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x5824
25C
Roads in Berland
graphs
,
shortest paths
1900
x5824
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5149
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x4978
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4788
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4741
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4287
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4044
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4013
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x3995
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3968
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3911
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3762
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3722
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3622
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2857
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2837
95C
Volleyball
shortest paths
1900
x2664
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x2637
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1774
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x7957
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5010
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4836
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4496
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4369
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4241
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4217
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3091
59E
Shortest Path
graphs
,
shortest paths
2000
x3088
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2821
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2804
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2788
666B
World Tour
graphs
,
shortest paths
2000
x2056
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