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Before contest
Codeforces Round 950 (Div. 3)
34:39:20
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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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Custom test
Problems
#
Name
323B
Tournament-graph
constructive algorithms
,
graphs
2200
x366
320B
Ping-Pong (Easy Version)
dfs and similar
,
graphs
1500
x7107
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x491
311C
Fetch the Treasure
brute force
,
data structures
,
graphs
,
shortest paths
2500
x477
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x857
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x2273
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x6140
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1660
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x13226
292B
Network Topology
graphs
,
implementation
1200
x7736
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x128
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3613
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1201
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1556
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1011
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1176
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x429
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1622
267B
Dominoes
dfs and similar
,
graphs
2000
x616
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x713
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3263
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1317
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x498
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2543
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9232
245G
Suggested Friends
brute force
,
graphs
2200
x425
243B
Hydra
graphs
,
sortings
2000
x1181
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1811
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8109
241E
Flights
graphs
,
shortest paths
2600
x1001
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x348
238E
Meeting Her
dp
,
graphs
,
shortest paths
2600
x343
237E
Build String
flows
,
graphs
2000
x1605
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x547
235D
Graph Game
graphs
3000
x478
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x282
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2458
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1561
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1596
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4489
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2361
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x914
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x190
223D
Spider
geometry
,
graphs
3000
x69
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8714
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20501
212A
Privatization
flows
,
graphs
3000
x188
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x703
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1789
196E
Opening Portals
dsu
,
graphs
,
shortest paths
2600
x835
196B
Infinite Maze
dfs and similar
,
graphs
2000
x2132
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x690
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3858
191D
Metro Scheme
graphs
,
greedy
2700
x347
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1445
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x280
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2458
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2462
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x65
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x247
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x548
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x191
164C
Machine Programming
flows
,
graphs
2400
x877
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x979
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2377
156D
Clues
combinatorics
,
graphs
2500
x1481
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2698
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x463
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3982
147B
Smile House
binary search
,
graphs
,
matrices
2500
x747
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3815
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x867
141D
Take-off Ramps
graphs
,
shortest paths
2300
x884
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x460
132E
Bits of merry old England
flows
,
graphs
2700
x522
131D
Subway
dfs and similar
,
graphs
1600
x4519
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11754
125E
MST Company
binary search
,
graphs
2400
x1014
118E
Bertown roads
dfs and similar
,
graphs
2000
x6035
117C
Cycle
dfs and similar
,
graphs
2000
x2552
115A
Party
dfs and similar
,
graphs
,
trees
900
x33029
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3548
107D
Crime Management
dp
,
graphs
,
matrices
2400
x401
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4961
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8558
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x371
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x299
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1396
94B
Friends
graphs
,
implementation
,
math
1300
x4517
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x262
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x864
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x511
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x853
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x921
83C
Track
graphs
,
greedy
,
shortest paths
2400
x403
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x329
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x530
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1456
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x951
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x616
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