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Codeforces Round 940 (Div. 2) and CodeCraft-23
3 days
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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
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Problems
#
Name
741A
Arpa's loud Owf and Mehrdad's evil plan
dfs and similar
,
math
1600
x5393
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5390
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5380
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5326
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5295
616C
The Labyrinth
dfs and similar
1600
x5292
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5278
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5228
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5178
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5122
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5122
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5118
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5116
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5111
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5103
1702G1
Passable Paths (easy version)
dfs and similar
,
trees
1900
x5070
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x4987
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x4980
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x4978
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x4974
710E
Generate a String
dfs and similar
,
dp
2000
x4955
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4930
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x4928
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4923
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4906
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4900
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4880
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4871
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4862
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x4852
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4836
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4834
34D
Road Map
dfs and similar
,
graphs
1600
x4834
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4788
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4765
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4741
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4728
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4698
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4661
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4603
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4541
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4518
131D
Subway
dfs and similar
,
graphs
1600
x4491
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4463
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4447
60B
Serial Time!
dfs and similar
,
dsu
1400
x4426
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4414
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4401
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4386
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4381
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4374
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4371
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4354
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4342
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4327
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4325
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4286
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4257
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4250
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4240
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4217
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4183
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4085
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4008
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4008
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4006
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3968
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3941
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x3938
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3937
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3898
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3855
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3844
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3802
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3765
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3764
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3763
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3762
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3757
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3756
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x3730
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x3713
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3668
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3661
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3645
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3643
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3622
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3604
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3602
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3588
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3566
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3560
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3524
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3523
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3517
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3481
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3474
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3459
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3403
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x3383
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