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Codeforces Round 941 (Div. 1)
3 days
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Codeforces Round 941 (Div. 2)
3 days
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dfs and similar
combine-tags-by-or
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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
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implementation
interactive
math
matrices
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Problems
#
Name
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5402
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5396
741A
Arpa's loud Owf and Mehrdad's evil plan
dfs and similar
,
math
1600
x5393
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5334
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5305
616C
The Labyrinth
dfs and similar
1600
x5296
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5293
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5278
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5179
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5135
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5124
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5123
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5121
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5115
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5112
1702G1
Passable Paths (easy version)
dfs and similar
,
trees
1900
x5079
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x4988
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x4988
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x4987
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x4977
710E
Generate a String
dfs and similar
,
dp
2000
x4963
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4953
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4933
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x4933
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4927
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4911
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4895
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4884
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4867
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x4862
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4847
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4847
34D
Road Map
dfs and similar
,
graphs
1600
x4845
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4824
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4797
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4773
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4756
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4717
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4663
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4610
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4552
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4530
131D
Subway
dfs and similar
,
graphs
1600
x4496
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4463
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4456
60B
Serial Time!
dfs and similar
,
dsu
1400
x4430
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4417
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4411
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4392
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4390
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4378
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4378
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4362
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4346
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4331
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4329
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4291
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4266
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4261
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4245
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4219
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4186
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4092
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4014
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4009
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4007
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3973
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x3950
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3944
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3941
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3902
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3861
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3850
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3809
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3772
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3767
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3767
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3765
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3765
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3762
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x3732
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x3715
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3683
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3679
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3650
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3645
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3629
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3628
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3605
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3593
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3572
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3572
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3569
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3533
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3521
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3482
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3477
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3475
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3408
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x3387
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