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Educational Codeforces Round 165 (Rated for Div. 2)
28:17:51
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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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Problems
#
Name
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16093
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13772
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x13056
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10413
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x10348
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x10319
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9252
1249E
By Elevator or Stairs?
dp
,
shortest paths
1700
x9204
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8120
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6916
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6525
1204C
Anna, Svyatoslav and Maps
dp
,
graphs
,
greedy
,
shortest paths
1700
x6428
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x5947
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5798
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4561
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4450
1202B
You Are Given a Decimal String...
brute force
,
dp
,
shortest paths
1700
x4357
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3482
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2102
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x7992
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x7419
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7305
1063B
Labyrinth
graphs
,
shortest paths
1800
x7046
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6234
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5741
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5378
1076D
Edge Deletion
graphs
,
greedy
,
shortest paths
1800
x4889
33B
String Problem
shortest paths
1800
x4063
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x3875
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x2847
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x2840
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2505
187B
AlgoRace
dp
,
shortest paths
1800
x1924
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1719
20C
Dijkstra?
graphs
,
shortest paths
1900
x29740
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6870
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6285
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6015
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x5839
25C
Roads in Berland
graphs
,
shortest paths
1900
x5839
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5163
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x4990
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4804
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4765
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4295
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4046
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4031
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4024
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3974
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3914
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3774
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3727
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3630
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2891
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2840
95C
Volleyball
shortest paths
1900
x2667
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x2661
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1777
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x8002
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5023
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4863
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4507
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4377
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4252
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4221
59E
Shortest Path
graphs
,
shortest paths
2000
x3105
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3097
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2866
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2825
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2795
666B
World Tour
graphs
,
shortest paths
2000
x2063
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1826
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1270
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1128
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5119
1343E
Weights Distributing
brute force
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x4805
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4394
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x4098
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3945
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x3829
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3766
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3137
507E
Breaking Good
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2589
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2330
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2165
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x2104
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2033
912D
Fishes
data structures
,
graphs
,
greedy
,
probabilities
,
shortest paths
2100
x1935
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1654
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1606
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1574
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1291
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x948
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x898
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x411
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3480
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3195
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2789
590C
Three States
dfs and similar
,
graphs
,
shortest paths
2200
x2604
1196F
K-th Path
brute force
,
constructive algorithms
,
shortest paths
,
sortings
2200
x2301
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