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Codeforces Round 950 (Div. 3)
47:25:45
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Difficulty:
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brute force
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
298B
Sail
brute force
,
greedy
,
implementation
1200
x13609
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x308
293C
Cube Problem
brute force
,
math
,
number theory
2400
x555
293B
Distinct Paths
brute force
,
combinatorics
2700
x774
292C
Beautiful IP Addresses
brute force
2000
x934
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1666
289B
Polo the Penguin and Matrix
brute force
,
dp
,
implementation
,
sortings
,
ternary search
1400
x16814
289A
Polo the Penguin and Segments
brute force
,
implementation
1100
x8774
287A
IQ Test
brute force
,
implementation
1100
x18951
284B
Cows and Poker Game
brute force
,
implementation
1000
x6682
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x2938
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x200
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x48459
279A
Point on Spiral
brute force
,
geometry
,
implementation
1400
x5516
278B
New Problem
brute force
,
strings
1500
x3421
274C
The Last Hole!
brute force
,
geometry
2600
x348
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x12495
271A
Beautiful Year
brute force
800
x129000
268A
Games
brute force
800
x81676
263E
Rhombus
brute force
,
data structures
,
dp
2500
x395
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1056
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x406
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x422
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3747
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13713
259A
Little Elephant and Chess
brute force
,
strings
1000
x8953
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1423
257C
View Angle
brute force
,
geometry
,
math
1800
x4208
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4641
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x498
254B
Jury Size
brute force
,
implementation
1500
x2135
253D
Table with Letters - 2
brute force
,
two pointers
2000
x811
252B
Unsorting Array
brute force
,
sortings
1800
x1687
252A
Little Xor
brute force
,
implementation
1100
x5179
250E
Mad Joe
brute force
2000
x439
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9232
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2608
245G
Suggested Friends
brute force
,
graphs
2200
x425
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x861
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4396
242A
Heads or Tails
brute force
,
implementation
1100
x6244
241F
Race
brute force
,
implementation
2300
x261
239B
Easy Tape Programming
brute force
,
implementation
1500
x1361
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x195532
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x7337
231D
Magic Box
brute force
,
geometry
1600
x4042
231A
Team
brute force
,
greedy
800
x302593
229A
Shifts
brute force
,
two pointers
1500
x3453
228B
Two Tables
brute force
,
implementation
1400
x3434
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x25544
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10418
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6560
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x8960
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x246
217B
Blackboard Fibonacci
brute force
,
math
2100
x862
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20500
215C
Crosses
brute force
,
implementation
2100
x533
215A
Bicycle Chain
brute force
,
implementation
900
x13990
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4898
214A
System of Equations
brute force
800
x33880
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x5950
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x21664
203B
Game on Paper
brute force
,
implementation
1300
x2560
203A
Two Problems
brute force
,
implementation
1200
x4114
202B
Brand New Easy Problem
brute force
1700
x809
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15957
201D
Brand New Problem
bitmasks
,
brute force
,
dp
2600
x390
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x879
200C
Football Championship
brute force
,
implementation
1800
x1005
200A
Cinema
brute force
,
data structures
2400
x661
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25286
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x8507
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x323
193B
Xor
brute force
2000
x993
192B
Walking in the Rain
brute force
,
implementation
1100
x6153
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10169
189B
Counting Rhombi
brute force
,
math
1300
x3879
189A
Cut Ribbon
brute force
,
dp
1300
x63265
183B
Zoo
brute force
,
geometry
1700
x678
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7840
181B
Number of Triplets
binary search
,
brute force
1300
x2903
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x6737
177D1
Encrypting Messages
brute force
1200
x2058
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2458
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x261
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x294
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2352
173C
Spiral Maximum
brute force
,
dp
1900
x966
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5914
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1253
171D
Broken checker
*special problem
,
brute force
1300
x2520
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6293
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x11924
164D
Minimum Diameter
binary search
,
brute force
3100
x230
163D
Large Refrigerator
brute force
2900
x483
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x463
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4694
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4258
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2923
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6185
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