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Before contest
Codeforces Round 973 (Div. 2)
13:49:28
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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
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9917
367C
Sereja and the Arrangement of Numbers
graphs
,
greedy
,
sortings
2000
x1780
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x805
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x926
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x699
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x394
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x767
350B
Resort
graphs
1500
x3176
346D
Robot Control
dp
,
graphs
,
shortest paths
2600
x741
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x79
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8828
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x720
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5745
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8293
332D
Theft of Blueprints
graphs
,
math
2400
x384
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x165
331D2
Escaping on Beaveractor
graphs
2600
x134
330B
Road Construction
constructive algorithms
,
graphs
1300
x16933
327D
Block Tower
constructive algorithms
,
dfs and similar
,
graphs
1900
x2269
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x780
325C
Monsters and Diamonds
dfs and similar
,
graphs
,
shortest paths
2600
x337
323B
Tournament-graph
constructive algorithms
,
graphs
2200
x392
320B
Ping-Pong (Easy Version)
dfs and similar
,
graphs
1500
x7192
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x495
311C
Fetch the Treasure
brute force
,
data structures
,
graphs
,
shortest paths
2500
x480
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x875
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x2385
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x6266
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1689
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x13876
292B
Network Topology
graphs
,
implementation
1200
x8162
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x132
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3653
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1275
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1596
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1029
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1218
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x449
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1672
267B
Dominoes
dfs and similar
,
graphs
2000
x632
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x890
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3582
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1535
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x535
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2592
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9397
245G
Suggested Friends
brute force
,
graphs
2200
x431
243B
Hydra
graphs
,
sortings
2000
x1221
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1864
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8524
241E
Flights
graphs
,
shortest paths
2600
x1062
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x356
238E
Meeting Her
dp
,
graphs
,
shortest paths
2600
x383
237E
Build String
flows
,
graphs
2000
x1700
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x561
235D
Graph Game
graphs
3000
x504
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x286
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2512
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1834
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1614
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4636
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2422
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x944
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x191
223D
Spider
geometry
,
graphs
3000
x70
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x9289
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x21054
212A
Privatization
flows
,
graphs
3000
x203
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x730
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1835
196E
Opening Portals
dsu
,
graphs
,
shortest paths
2600
x920
196B
Infinite Maze
dfs and similar
,
graphs
2000
x2205
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x700
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3987
191D
Metro Scheme
graphs
,
greedy
2700
x364
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1518
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x280
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2546
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2546
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x66
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x248
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x572
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x193
164C
Machine Programming
flows
,
graphs
2400
x895
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x1008
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2491
156D
Clues
combinatorics
,
graphs
2500
x1559
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2786
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x481
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4118
147B
Smile House
binary search
,
graphs
,
matrices
2500
x783
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3944
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x1067
141D
Take-off Ramps
graphs
,
shortest paths
2300
x894
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x471
132E
Bits of merry old England
flows
,
graphs
2700
x533
131D
Subway
dfs and similar
,
graphs
1600
x4650
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12117
125E
MST Company
binary search
,
graphs
2400
x1065
118E
Bertown roads
dfs and similar
,
graphs
2000
x6518
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