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Codeforces Round 945 (Div. 2)
3 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
x127137
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x48037
20C
Dijkstra?
graphs
,
shortest paths
1900
x29977
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x24441
3A
Shortest path of the king
greedy
,
shortest paths
1000
x18577
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x18246
1759C
Thermostat
greedy
,
math
,
shortest paths
1100
x17019
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17011
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16178
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x15263
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14479
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x14447
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x13940
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13874
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13863
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x13687
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x13133
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12366
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12322
601A
The Two Routes
graphs
,
shortest paths
1600
x11447
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x10542
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10454
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x10386
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10340
370A
Rook, Bishop and King
graphs
,
math
,
shortest paths
1100
x9915
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9275
1249E
By Elevator or Stairs?
dp
,
shortest paths
1700
x9227
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8140
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8056
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x8050
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x7455
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7337
1063B
Labyrinth
graphs
,
shortest paths
1800
x7075
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6960
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6916
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6678
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6613
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x6527
1204C
Anna, Svyatoslav and Maps
dp
,
graphs
,
greedy
,
shortest paths
1700
x6463
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6354
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6307
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6272
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6250
329B
Biridian Forest
dfs and similar
,
shortest paths
1500
x6122
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6032
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6019
25C
Roads in Berland
graphs
,
shortest paths
1900
x5885
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x5859
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5806
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5780
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5604
786B
Legacy
data structures
,
graphs
,
shortest paths
2300
x5451
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5440
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5197
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5190
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5131
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x5025
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x4984
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4924
1076D
Edge Deletion
graphs
,
greedy
,
shortest paths
1800
x4909
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4830
1343E
Weights Distributing
brute force
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x4815
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4777
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4568
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4517
1202B
You Are Given a Decimal String...
brute force
,
dp
,
shortest paths
1700
x4500
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4480
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4470
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4409
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4397
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4342
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4314
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4274
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4233
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x4120
198B
Jumping on Walls
shortest paths
1400
x4110
33B
String Problem
shortest paths
1800
x4091
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4063
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4049
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4036
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3987
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3951
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3929
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x3895
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x3832
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3790
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3768
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3735
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3658
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3507
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3483
1473E
Minimum Path
graphs
,
shortest paths
2400
x3313
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3202
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3155
59E
Shortest Path
graphs
,
shortest paths
2000
x3128
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3103
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2960
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2914
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x2872
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2864
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