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Before contest
Codeforces Round 950 (Div. 3)
38:40:46
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Difficulty:
—
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
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x491
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x164
316F1
Suns and Rays
dfs and similar
,
implementation
2200
x165
316B2
EKG
dfs and similar
,
dp
1600
x1570
316B1
EKG
brute force
,
dfs and similar
1500
x1362
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1455
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x6140
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2336
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1280
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x128
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x677
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3613
277A
Learning Languages
dfs and similar
,
dsu
1400
x18206
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1011
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4906
267B
Dominoes
dfs and similar
,
graphs
2000
x616
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3263
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1056
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1036
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
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x169
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x2996
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9232
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4396
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x522
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1811
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8109
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x348
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1036
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x547
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1561
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
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8712
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x246
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20501
216B
Forming Teams
dfs and similar
,
implementation
1700
x6128
213A
Game
dfs and similar
,
greedy
1700
x1690
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1681
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6160
208B
Solitaire
dfs and similar
,
dp
1900
x1345
196B
Infinite Maze
dfs and similar
,
graphs
2000
x2132
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x6792
190C
STL
dfs and similar
1500
x2724
187C
Weak Memory
dfs and similar
,
dsu
2000
x1301
183C
Cyclic Coloring
dfs and similar
2200
x599
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2458
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2462
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1041
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x2890
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x269
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x548
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6295
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x979
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1537
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13740
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2377
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3982
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3815
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x294
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1927
131D
Subway
dfs and similar
,
graphs
1600
x4519
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11754
128A
Statues
dfs and similar
1500
x3133
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x694
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
x33028
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4961
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8558
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x75
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x371
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x853
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x523
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x800
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x329
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x978
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x951
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x616
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x86
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x421
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x717
62D
Wormhouse
dfs and similar
,
graphs
2300
x350
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6283
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x552
60B
Serial Time!
dfs and similar
,
dsu
1400
x4463
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2820
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x548
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x193
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6423
34D
Road Map
dfs and similar
,
graphs
1600
x4881
31D
Chocolate
dfs and similar
,
implementation
2000
x1000
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2335
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4599
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4432
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2380
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5170
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1555
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1635
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