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I decided to step up to Guff's challenge

Started by ncba93ivyase, January 19, 2009, 11:18:13 PM

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Daddy


Daddy

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for modules whose descriptions contain the word "spam".[/spoiler]

Uhm, so I have a question for the guy in red.  Why won't idle open a new window :(

Daddy

January 22, 2009, 08:44:05 AM #17 Last Edit: January 22, 2009, 08:52:38 AM by Hulk Hogan
multi3 = range(3, 1000, 3)
multi5 = range(5, 1000, 5)
multi3and5 = range(15, 1000, 15)
sum(multi3) +sum(multi5) - sum(multi3and5)
oh yay.
wait a minute, i can reduce that to one line why am i using variables.  baddood;

Code Select
sum(range(3, 1000, 3)) +sum(range(5, 1000, 5)) - sum(range(15, 1000, 15))


the first time I did that in december I didn't know about the sum function :(


My original solution for the problem.
[spoiler]a = 0
b = 0
guff = 0
for i in range(3, 1000, 3):
    a = a+ i
for i in range(5, 1000, 5):
    b = b+i
for i in range(15, 1000, 15):
    guff = guff+i;
print a+b-guff[/spoiler]



Daddy

Does anyone know why
Code Select
a = 0
b = 1
while a <= 100:
c=a
a=b
b=c+b
print b

Doesn't run directly in idle? It was pissing me off because I was all "wtf man, that code is correct" but it wouldn't run. I then saved it and did python ./Euler_2.py and it gave me.
QuoteValenteMac:Euler jamesvalente$ python ./Euler_2.py
1
2
3
5
8
13
21
34
55
89
144
233

Which isn't what the problem is asking for, nor what I coded. I just needed a working sequence first.

Daddy

January 22, 2009, 10:08:08 AM #19 Last Edit: January 22, 2009, 10:11:40 AM by JMV
And there we go.  hocuspocus;
Code Select
#!/usr/bin/python
# Filename : Euler_2.py
#Find the sum of all the even-valued terms in the sequence which do not exceed four million.
a = 0
b = 1
d = 0
while a <= 4000000:
c=a
a=b
b+=c
if a%2==0:
  d+= a
print d



ncba93ivyase

Quote from: andrƃĀ© the giant on January 22, 2009, 06:55:36 AM
okay how many you got now  baddood;

i haven't done any new ones yet but i did just redo number 12
my solution takes about 3.5 seconds to run though  saddood;
no, i just reworked my solutions to the previous ones to run in ruby

But I'm going to try a couple after I wake up tonight.

Quote from: ncba93ivyase on June 18, 2014, 07:58:34 PMthis isa great post i will use it in my sig

guff

Quote from: Pancake Persona on January 22, 2009, 12:49:12 PM
no, i just reworked my solutions to the previous ones to run in ruby

But I'm going to try a couple after I wake up tonight.
i was into ruby for a while but then i gave up on it because it didn't have list comprehensions (yeah sure there are ways to do the same thing in ruby but they take a little more effort and more typing and aren't as pretty >:o)  akudood;

but seriously learn about list comprehensions and generator expressions and iterators and blah and blah etc. baddood;

guff

also i rewrote my solution to problem 2:
Code Select
def fib(n):
fib1 = 0
fib2 = 1
for i in range(n - 1):
fib2, fib1 = fib2 + fib1, fib2
return fib2 if n > 0 else 0

import itertools
print(sum(itertools.takewhile(lambda x: x < 4e6, (fib(n) for n in itertools.count() if n % 3 == 0))))


fuck yes generator expressions  akudood;

also i'm using python3

also this guy has a crazy fast implementation of a fibonacci function
i did a test of fib(2**n) for n from 0 to 19 using the one i wrote above and his version:
[spoiler]
Code Select
0: fib1 time: 1.09673e-05, fib2time: 2.14577e-06; ratio: 5.11111
1: fib1 time: 5.96046e-06, fib2time: 1.78814e-05; ratio: 0.333333
2: fib1 time: 5.96046e-06, fib2time: 9.05991e-06; ratio: 0.657895
3: fib1 time: 2.19345e-05, fib2time: 1.00136e-05; ratio: 2.19048
4: fib1 time: 8.10623e-06, fib2time: 2.7895e-05; ratio: 0.290598
5: fib1 time: 1.00136e-05, fib2time: 2.90871e-05; ratio: 0.344262
6: fib1 time: 1.50204e-05, fib2time: 5.22137e-05; ratio: 0.287671
7: fib1 time: 4.31538e-05, fib2time: 1.69277e-05; ratio: 2.5493
8: fib1 time: 6.60419e-05, fib2time: 2.09808e-05; ratio: 3.14773
9: fib1 time: 0.000129938, fib2time: 2.59876e-05; ratio: 5.0
10: fib1 time: 0.000296831, fib2time: 3.79086e-05; ratio: 7.83019
11: fib1 time: 0.000808954, fib2time: 6.81877e-05; ratio: 11.8636
12: fib1 time: 0.00269389, fib2time: 0.000169039; ratio: 15.9365
13: fib1 time: 0.00888014, fib2time: 0.000478983; ratio: 18.5396
14: fib1 time: 0.031538, fib2time: 0.00162387; ratio: 19.4215
15: fib1 time: 0.119242, fib2time: 0.00447392; ratio: 26.6527
16: fib1 time: 0.460428, fib2time: 0.0133159; ratio: 34.5773
17: fib1 time: 1.81237, fib2time: 0.0404069; ratio: 44.8529
18: fib1 time: 10.1864, fib2time: 0.123036; ratio: 82.7918
19: fib1 time: 43.4756, fib2time: 0.384916; ratio: 112.948
[/spoiler]

ncba93ivyase

my solution to number 6:
Code Select
g = []
x = 0
for i in range(1, 101):
g.append(i**2)
x += i
print x**2 - sum(g)

I'm certain guff will criticize my method of doing it, but I'm willing to learn.

Quote from: ncba93ivyase on June 18, 2014, 07:58:34 PMthis isa great post i will use it in my sig

guff

Quote from: Pancake Persona on January 23, 2009, 01:16:32 AM
my solution to number 6:
Code Select
g = []
x = 0
for i in range(1, 101):
g.append(i**2)
x += i
print x**2 - sum(g)

I'm certain guff will criticize my method of doing it, but I'm willing to learn.
it's not bad but as i've said before USE LIST COMPREHENSIONS
also it's kind of weird that for x you just use an int but for g you use a list
this would be more consistent:
Code Select

x, g = 0, 0
for i in range(1, 101):
g += i ** 2
x += i
print x**2 - g


but anyways what i did was something more like print(sum(i for i in range(101)) ** 2 - sum(i ** 2 for i in range(101)))

guff

also if you want to do it all maths-like, then print(sum(i**3 - i**2 for i in range(101))) is prettier and also works akudood;

ncba93ivyase

Quote from: andrƃĀ© the giant on January 23, 2009, 04:45:40 AM
it's not bad but as i've said before USE LIST COMPREHENSIONS
also it's kind of weird that for x you just use an int but for g you use a list
i don't know why i did it, but it's probably because i just slapped together something in 15 seconds and didn't bother thinking about alternative (and superior) methods

Quote from: ncba93ivyase on June 18, 2014, 07:58:34 PMthis isa great post i will use it in my sig

guff

both of you still need to learn list comprehensions  baddood;

ncba93ivyase


Quote from: ncba93ivyase on June 18, 2014, 07:58:34 PMthis isa great post i will use it in my sig

guff


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