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Before contest
Codeforces Round 941 (Div. 1)
23:19:56
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Before contest
Codeforces Round 941 (Div. 2)
23:19:56
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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
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number theory
probabilities
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strings
ternary search
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Problems
#
Name
1270G
Subset with Zero Sum
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x2029
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x330
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x832
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13215
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x259
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8821
1250N
Wires
dfs and similar
,
graphs
,
greedy
2000
x1542
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16222
1242C
Sum Balance
bitmasks
,
dfs and similar
,
dp
,
graphs
2400
x1465
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x6954
1239D
Catowice City
2-sat
,
dfs and similar
,
graph matchings
,
graphs
2400
x1862
1238F
The Maximum Subtree
dfs and similar
,
dp
,
graphs
,
trees
2200
x1684
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x168
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2540
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x571
1218H
Function Composition
dfs and similar
2900
x108
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x4933
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x369
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4928
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2327
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1067
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x8793
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2093
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x946
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x909
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x995
1188A2
Add on a Tree: Revolution
constructive algorithms
,
dfs and similar
,
implementation
,
trees
2500
x1069
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x7399
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x743
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x897
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x800
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x10837
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x406
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x1901
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10405
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5125
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3179
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x3715
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x16879
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1696
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3624
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6126
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4826
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x932
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8799
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x723
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1060
1144F
Graph Without Long Directed Paths
dfs and similar
,
graphs
1700
x10747
1143C
Queen
dfs and similar
,
trees
1400
x11164
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2638
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2183
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x11958
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3089
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1397
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3022
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8305
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1258
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x501
1118F1
Tree Cutting (Easy Version)
dfs and similar
,
trees
1800
x5579
1111E
Tree
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2500
x840
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x13883
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3973
1103C
Johnny Solving
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x777
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4392
1100E
Andrew and Taxi
binary search
,
dfs and similar
,
graphs
2200
x2285
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x907
1098C
Construct a tree
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x865
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8352
1093D
Beautiful Graph
dfs and similar
,
graphs
1700
x8457
1092F
Tree with Maximum Cost
dfs and similar
,
dp
,
trees
1900
x7132
1092E
Minimal Diameter Forest
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2000
x1615
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x105
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x518
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2505
1065F
Up and Down the Tree
dfs and similar
,
dp
,
trees
2500
x1131
1065D
Three Pieces
dfs and similar
,
dp
,
shortest paths
2200
x1268
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x542
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1702
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3861
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x2972
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x5743
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5614
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x620
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1540
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1237
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1311
1038E
Maximum Matching
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x951
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13759
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x361
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x578
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x12909
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1504
1027D
Mouse Hunt
dfs and similar
,
graphs
1700
x6988
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x857
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x20142
1016F
Road Projects
dfs and similar
,
dp
,
trees
2600
x772
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3646
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2338
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x9397
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1606
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