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Before contest
Codeforces Round 937 (Div. 4)
01:32:44
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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
1250N
Wires
dfs and similar
,
graphs
,
greedy
2000
x1538
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16148
1242C
Sum Balance
bitmasks
,
dfs and similar
,
dp
,
graphs
2400
x1456
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x6909
1239D
Catowice City
2-sat
,
dfs and similar
,
graph matchings
,
graphs
2400
x1847
1238F
The Maximum Subtree
dfs and similar
,
dp
,
graphs
,
trees
2200
x1675
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x163
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2526
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x569
1218H
Function Composition
dfs and similar
2900
x106
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x4903
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x367
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4913
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2289
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1058
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x8725
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2053
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x925
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x894
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x980
1188A2
Add on a Tree: Revolution
constructive algorithms
,
dfs and similar
,
implementation
,
trees
2500
x1064
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x7259
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x736
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x887
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x776
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x10791
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x397
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x1885
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10262
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5102
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3130
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x3703
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x16499
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1667
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3492
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x5962
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4668
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x927
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8650
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x717
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1059
1144F
Graph Without Long Directed Paths
dfs and similar
,
graphs
1700
x10497
1143C
Queen
dfs and similar
,
trees
1400
x10988
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2601
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2170
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x11722
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x2935
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1390
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x2995
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8266
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1238
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x492
1118F1
Tree Cutting (Easy Version)
dfs and similar
,
trees
1800
x5506
1111E
Tree
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2500
x823
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x13733
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3959
1103C
Johnny Solving
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x769
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4350
1100E
Andrew and Taxi
binary search
,
dfs and similar
,
graphs
2200
x2272
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x896
1098C
Construct a tree
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x860
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8318
1093D
Beautiful Graph
dfs and similar
,
graphs
1700
x8276
1092F
Tree with Maximum Cost
dfs and similar
,
dp
,
trees
1900
x6905
1092E
Minimal Diameter Forest
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2000
x1603
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x104
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x516
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2487
1065F
Up and Down the Tree
dfs and similar
,
dp
,
trees
2500
x1122
1065D
Three Pieces
dfs and similar
,
dp
,
shortest paths
2200
x1264
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x538
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1692
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3844
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x2956
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x5686
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5554
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x611
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1539
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1199
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1308
1038E
Maximum Matching
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x944
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13587
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x359
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x570
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x12815
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1501
1027D
Mouse Hunt
dfs and similar
,
graphs
1700
x6914
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x845
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x19938
1016F
Road Projects
dfs and similar
,
dp
,
trees
2600
x770
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3634
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2298
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x9334
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1581
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3817
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6283
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2400
x866
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2171
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x180
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x10628
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