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Codeforces Round 937 (Div. 4)
05:47:51
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Difficulty:
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dfs and similar
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
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3654
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x3702
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x3702
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3721
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3732
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3737
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3738
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3758
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3769
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3817
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3835
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3844
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3882
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3921
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x3922
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3959
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x3968
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x3969
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x3984
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x3990
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4052
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4163
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4204
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4207
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4229
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4263
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4302
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4312
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4315
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4330
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4332
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4333
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4343
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4350
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4360
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4373
60B
Serial Time!
dfs and similar
,
dsu
1400
x4393
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4408
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4455
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4462
131D
Subway
dfs and similar
,
graphs
1600
x4477
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4500
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4594
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4598
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4668
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4686
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4718
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4724
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4739
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4751
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4783
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4788
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x4794
34D
Road Map
dfs and similar
,
graphs
1600
x4800
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4810
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4846
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4859
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4860
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4877
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x4903
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4912
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x4915
710E
Generate a String
dfs and similar
,
dp
2000
x4927
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x4946
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x4950
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x4962
1702G1
Passable Paths (easy version)
dfs and similar
,
trees
1900
x5032
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5032
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5080
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5093
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5100
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5102
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5105
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5160
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5181
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5226
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5238
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5255
616C
The Labyrinth
dfs and similar
1600
x5263
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5316
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5357
741A
Arpa's loud Owf and Mehrdad's evil plan
dfs and similar
,
math
1600
x5382
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5402
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5442
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5443
1118F1
Tree Cutting (Easy Version)
dfs and similar
,
trees
1800
x5506
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5506
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5554
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5569
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5579
813C
The Tag Game
dfs and similar
,
graphs
1700
x5602
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5608
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5622
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5627
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5635
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5636
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x5682
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x5685
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x5692
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5733
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