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Before contest
Codeforces Round #793 (Div. 2)
33:08:50
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Difficulty:
—
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
x85669
3A
Shortest path of the king
greedy
,
shortest paths
1000
x14291
370A
Rook, Bishop and King
graphs
,
math
,
shortest paths
1100
x7483
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x19940
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x11082
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x33302
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x11514
198B
Jumping on Walls
shortest paths
1400
x3095
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x12693
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x12644
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x10990
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x10445
329B
Biridian Forest
dfs and similar
,
shortest paths
1500
x4811
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x4437
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x3214
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x9722
601A
The Two Routes
graphs
,
shortest paths
1600
x9251
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x5453
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x5107
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x4938
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x4352
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x3766
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2096
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x12011
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x10152
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x8809
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x7883
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x7538
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x7219
1249E
By Elevator or Stairs?
dp
,
shortest paths
1700
x7104
1204C
Anna, Svyatoslav and Maps
dp
,
graphs
,
greedy
,
shortest paths
1700
x5796
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5171
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x4814
1202B
You Are Given a Decimal String...
brute force
,
dp
,
shortest paths
1700
x3937
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x3480
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x3443
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3174
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x1665
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x6106
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x5944
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x5728
1063B
Labyrinth
graphs
,
shortest paths
1800
x5390
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x4594
1076D
Edge Deletion
graphs
,
greedy
,
shortest paths
1800
x3903
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x3203
33B
String Problem
shortest paths
1800
x2753
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2155
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x1956
187B
AlgoRace
dp
,
shortest paths
1800
x1595
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1518
20C
Dijkstra?
graphs
,
shortest paths
1900
x19337
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x5408
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x4961
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x4737
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x4399
25C
Roads in Berland
graphs
,
shortest paths
1900
x4284
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x3786
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x3700
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x3686
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3565
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3465
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3405
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x3268
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3204
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x2941
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2681
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x2531
95C
Volleyball
shortest paths
1900
x2205
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1501
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x5470
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x3871
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x3779
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x3705
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x3668
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x3504
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x2615
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2414
59E
Shortest Path
graphs
,
shortest paths
2000
x2047
666B
World Tour
graphs
,
shortest paths
2000
x1785
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1631
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1091
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x941
1343E
Weights Distributing
brute force
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x4128
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x3698
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x3393
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3345
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x3265
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x3195
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x2992
507E
Breaking Good
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2298
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x1929
912D
Fishes
data structures
,
graphs
,
greedy
,
probabilities
,
shortest paths
2100
x1618
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x1570
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1493
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1406
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1221
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x805
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x728
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x714
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x329
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