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Problems
#
Name
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5559
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5520
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5501
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5429
741A
Arpa's loud Owf and Mehrdad's evil plan
dfs and similar
,
math
1600
x5402
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5361
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5359
616C
The Labyrinth
dfs and similar
1600
x5353
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5339
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5308
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5189
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5161
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5158
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5143
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5142
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5138
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5136
1702G1
Passable Paths (easy version)
dfs and similar
,
trees
1900
x5133
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x5039
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x5038
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x5011
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5000
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5000
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4999
710E
Generate a String
dfs and similar
,
dp
2000
x4982
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4963
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4956
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x4952
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4948
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4930
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x4926
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4900
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4893
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4893
34D
Road Map
dfs and similar
,
graphs
1600
x4865
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4847
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4842
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4840
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4788
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4757
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4674
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4618
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4583
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4573
131D
Subway
dfs and similar
,
graphs
1600
x4514
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4488
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4470
60B
Serial Time!
dfs and similar
,
dsu
1400
x4449
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4432
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4432
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4431
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4424
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4418
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4389
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4385
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4365
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4363
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4349
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4345
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4320
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4302
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4253
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4239
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4209
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4119
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4046
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4021
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4018
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3996
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x3984
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3971
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3963
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3955
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3954
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3879
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3869
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3858
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3835
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3797
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3790
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3787
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3786
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3771
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x3746
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x3738
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3709
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3702
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3698
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3680
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3662
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3657
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3619
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3610
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3585
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3582
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3560
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3556
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3551
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3543
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3513
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dfs and similar
combine-tags-by-or
*combine tags by OR
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binary search
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dfs and similar
divide and conquer
dp
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flows
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graphs
greedy
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