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Before contest
Codeforces Round 943 (Div. 3)
21:50:21
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Difficulty:
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graphs
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
292B
Network Topology
graphs
,
implementation
1200
x7693
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x126
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3607
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1187
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1542
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1005
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1171
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x413
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1592
267B
Dominoes
dfs and similar
,
graphs
2000
x608
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x709
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3240
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1310
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x497
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2520
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9185
245G
Suggested Friends
brute force
,
graphs
2200
x423
243B
Hydra
graphs
,
sortings
2000
x1176
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1805
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8001
241E
Flights
graphs
,
shortest paths
2600
x993
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x347
238E
Meeting Her
dp
,
graphs
,
shortest paths
2600
x337
237E
Build String
flows
,
graphs
2000
x1586
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x542
235D
Graph Game
graphs
3000
x474
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x279
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2446
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1536
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1591
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4453
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2339
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x911
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x187
223D
Spider
geometry
,
graphs
3000
x68
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8552
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20348
212A
Privatization
flows
,
graphs
3000
x186
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x690
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1777
196E
Opening Portals
dsu
,
graphs
,
shortest paths
2600
x829
196B
Infinite Maze
dfs and similar
,
graphs
2000
x2120
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x686
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3831
191D
Metro Scheme
graphs
,
greedy
2700
x342
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1431
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x278
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2430
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2443
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x64
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x246
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x545
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x190
164C
Machine Programming
flows
,
graphs
2400
x874
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x974
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2350
156D
Clues
combinatorics
,
graphs
2500
x1467
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2669
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x459
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3949
147B
Smile House
binary search
,
graphs
,
matrices
2500
x741
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3776
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x808
141D
Take-off Ramps
graphs
,
shortest paths
2300
x864
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x459
132E
Bits of merry old England
flows
,
graphs
2700
x521
131D
Subway
dfs and similar
,
graphs
1600
x4502
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11668
125E
MST Company
binary search
,
graphs
2400
x1005
118E
Bertown roads
dfs and similar
,
graphs
2000
x5972
117C
Cycle
dfs and similar
,
graphs
2000
x2542
115A
Party
dfs and similar
,
graphs
,
trees
900
x32768
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3519
107D
Crime Management
dp
,
graphs
,
matrices
2400
x400
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4926
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8514
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x370
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x296
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1383
94B
Friends
graphs
,
implementation
,
math
1300
x4487
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x260
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x861
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x510
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x845
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x908
83C
Track
graphs
,
greedy
,
shortest paths
2400
x401
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x325
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x526
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1443
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x949
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x612
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2053
62D
Wormhouse
dfs and similar
,
graphs
2300
x348
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6235
59E
Shortest Path
graphs
,
shortest paths
2000
x3107
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x545
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x363
48E
Ivan the Fool VS Gorynych the Dragon
dp
,
games
,
graphs
2100
x560
46F
Hercule Poirot Problem
dsu
,
graphs
2300
x307
45H
Road Problem
graphs
2100
x174
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