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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
25:43:53
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Difficulty:
—
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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Custom test
Problems
#
Name
258A
Little Elephant and Bits
greedy
,
math
1100
x22002
257D
Sum
greedy
,
math
1900
x1543
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x6852
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6375
254C
Anagram
greedy
,
strings
1800
x1467
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2518
253A
Boys and Girls
greedy
1100
x10919
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1011
250C
Movie Critics
greedy
1600
x1874
250A
Paper Work
greedy
1000
x3976
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x474
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2600
246B
Increase and Decrease
greedy
,
math
1300
x10905
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9033
245E
Mishap in Club
greedy
,
implementation
1400
x3220
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2214
245C
Game with Coins
greedy
1700
x1510
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1805
241A
Old Peykan
greedy
1300
x2202
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x345
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x18090
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1018
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x542
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x556
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2443
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3553
231A
Team
brute force
,
greedy
800
x298122
230A
Dragons
greedy
,
sortings
1000
x74085
229D
Towers
dp
,
greedy
,
two pointers
2100
x2099
226D
The table
constructive algorithms
,
greedy
2100
x945
226B
Naughty Stone Piles
greedy
1900
x1535
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3098
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11031
222D
Olympiad
binary search
,
greedy
,
sortings
,
two pointers
1900
x2127
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6539
216C
Hiring Staff
greedy
1800
x1797
215D
Hot Days
greedy
1900
x1575
215B
Olympic Medal
greedy
,
math
1300
x5354
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4880
213A
Game
dfs and similar
,
greedy
1700
x1686
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x690
207A3
Beaver's Calculator 1.0
greedy
2000
x201
207A2
Beaver's Calculator 1.0
greedy
1800
x221
207A1
Beaver's Calculator 1.0
greedy
1600
x271
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x5930
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x276
203C
Photographer
greedy
,
sortings
1400
x5570
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15837
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x504
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5291
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x494
191D
Metro Scheme
graphs
,
greedy
2700
x342
191B
Demonstration
greedy
1700
x993
190A
Vasya and the Bus
greedy
,
math
1100
x5709
187E
Heaven Tour
data structures
,
greedy
2900
x91
187A
Permutations
greedy
1500
x2715
186B
Growing Mushrooms
greedy
,
sortings
1200
x5287
183E
Candy Shop
greedy
2900
x130
183D
T-shirt
dp
,
greedy
,
probabilities
2700
x390
182C
Optimal Sum
data structures
,
greedy
2000
x705
180D
Name
greedy
,
strings
1900
x706
178A3
Educational Game
greedy
1100
x1391
178A2
Educational Game
greedy
1000
x1564
176A
Trading Business
greedy
,
sortings
1200
x1403
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x260
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1288
174C
Range Increments
data structures
,
greedy
1800
x1065
174B
File List
dp
,
greedy
,
implementation
1400
x2189
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x246
169B
Replacing Digits
greedy
1100
x3189
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x190
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x344
166C
Median
greedy
,
math
,
sortings
1500
x6337
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1922
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4673
160B
Unlucky Ticket
greedy
,
sortings
1100
x13555
160A
Twins
greedy
,
sortings
900
x110503
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x987
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3668
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2453
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x82248
155B
Combination
greedy
,
sortings
1100
x10003
154A
Hometask
greedy
1600
x3982
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5251
149A
Business trip
greedy
,
implementation
,
sortings
900
x37614
148C
Terse princess
constructive algorithms
,
greedy
1700
x3065
145A
Lucky Conversion
greedy
,
implementation
1200
x6953
144E
Competition
data structures
,
greedy
2200
x561
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2131
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2366
140D
New Year Contest
greedy
,
sortings
1800
x2193
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4196
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1476
138B
Digits Permutations
greedy
1900
x1001
137B
Permutation
greedy
1000
x13280
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1314
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7424
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x459
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x603
126C
E-reader Display
constructive algorithms
,
greedy
2000
x709
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