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Before contest
Codeforces Round 951 (Div. 2)
02:18:56
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Difficulty:
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greedy
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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Status
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Custom test
Problems
#
Name
309E
Sheep
binary search
,
greedy
2900
x219
309C
Memory for Arrays
binary search
,
bitmasks
,
greedy
1900
x1294
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x439
305C
Ivan and Powers of Two
greedy
,
implementation
1600
x2423
298B
Sail
brute force
,
greedy
,
implementation
1200
x13624
298A
Snow Footprints
greedy
,
implementation
1300
x10550
297B
Fish Weight
constructive algorithms
,
greedy
1600
x3452
296A
Yaroslav and Permutations
greedy
,
math
1100
x22131
294B
Shaass and Bookshelf
dp
,
greedy
1700
x4396
293A
Weird Game
games
,
greedy
1500
x2824
291D
Parallel Programming
*special problem
,
greedy
1600
x1468
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x128
288A
Polo the Penguin and Strings
greedy
1300
x6305
286C
Main Sequence
greedy
,
implementation
2100
x1296
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x22624
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x13144
282B
Painting Eggs
greedy
,
math
1500
x12627
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1412
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x13135
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x24431
276B
Little Girl and Game
games
,
greedy
1300
x27450
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1011
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4910
274A
k-Multiple Free Set
binary search
,
greedy
,
sortings
1500
x9901
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4088
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1622
269A
Magical Boxes
greedy
,
math
1600
x3482
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1336
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x16938
263B
Squares
greedy
,
implementation
,
sortings
900
x8746
262B
Roma and Changing Signs
greedy
1200
x10979
261A
Maxim and Discounts
greedy
,
sortings
1400
x5109
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1317
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2931
258A
Little Elephant and Bits
greedy
,
math
1100
x22194
257D
Sum
greedy
,
math
1900
x1547
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x6885
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6395
254C
Anagram
greedy
,
strings
1800
x1472
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2544
253A
Boys and Girls
greedy
1100
x10990
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1013
250C
Movie Critics
greedy
1600
x1884
250A
Paper Work
greedy
1000
x4005
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x485
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2608
246B
Increase and Decrease
greedy
,
math
1300
x11026
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9083
245E
Mishap in Club
greedy
,
implementation
1400
x3232
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2239
245C
Game with Coins
greedy
1700
x1520
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1812
241A
Old Peykan
greedy
1300
x2205
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x350
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x18268
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1048
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x547
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x557
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2461
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3563
231A
Team
brute force
,
greedy
800
x303328
230A
Dragons
greedy
,
sortings
1000
x75159
229D
Towers
dp
,
greedy
,
two pointers
2100
x2125
226D
The table
constructive algorithms
,
greedy
2100
x950
226B
Naughty Stone Piles
greedy
1900
x1538
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3109
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11185
222D
Olympiad
binary search
,
greedy
,
sortings
,
two pointers
1900
x2133
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6563
216C
Hiring Staff
greedy
1800
x1807
215D
Hot Days
greedy
1900
x1578
215B
Olympic Medal
greedy
,
math
1300
x5399
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4900
213A
Game
dfs and similar
,
greedy
1700
x1691
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x704
207A3
Beaver's Calculator 1.0
greedy
2000
x204
207A2
Beaver's Calculator 1.0
greedy
1800
x225
207A1
Beaver's Calculator 1.0
greedy
1600
x276
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x5953
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x277
203C
Photographer
greedy
,
sortings
1400
x5594
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15980
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x522
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5315
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x498
191D
Metro Scheme
graphs
,
greedy
2700
x347
191B
Demonstration
greedy
1700
x996
190A
Vasya and the Bus
greedy
,
math
1100
x5724
187E
Heaven Tour
data structures
,
greedy
2900
x94
187A
Permutations
greedy
1500
x2729
186B
Growing Mushrooms
greedy
,
sortings
1200
x5345
183E
Candy Shop
greedy
2900
x133
183D
T-shirt
dp
,
greedy
,
probabilities
2700
x394
182C
Optimal Sum
data structures
,
greedy
2000
x712
180D
Name
greedy
,
strings
1900
x715
178A3
Educational Game
greedy
1100
x1396
178A2
Educational Game
greedy
1000
x1580
176A
Trading Business
greedy
,
sortings
1200
x1419
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x261
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1293
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