On 11/02/2014 04:03 PM, Seymore4Head wrote:
On Sun, 02 Nov 2014 19:42:49 +0000, Mark Lawrence
<breamore...@yahoo.co.uk> wrote:
On 02/11/2014 19:10, Seymore4Head wrote:
On Sun, 2 Nov 2014 12:16:11 -0500, Joel Goldstick
<joel.goldst...@gmail.com> wrote:
On Sun, Nov 2, 2014 at 10:08 AM, Peter Otten <__pete...@web.de> wrote:
Huhuai Fan wrote:
Thanks for your help, but i have no idea to find a project that i can
complete,i am now in perplexed for what to do
Then write a small text-based brainstorming app!
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If you like math puzzles you can do the euler project stuff
target=1000
thelist=[]
thesum=0
for x in range (1,target):
if x%3==0: thelist.append(x)
if x%5==0 and x%3!=0: thelist.append(x)
for x in thelist: thesum+=x
print(thelist)
print (thesum)
In [1]: help(sum)
Help on built-in function sum in module builtins:
sum(...)
sum(iterable[, start]) -> value
Return the sum of an iterable of numbers (NOT strings) plus the value
of parameter 'start' (which defaults to 0). When the iterable is
empty, return start.
BTW I have the answer to question 2, but there is no way I would run
the code on numbers much more than 100000 and it wants the answer for
4,000,000.
So that's teaching you that there must be a more elegant approach than
brute-force. Sometimes you can use cleverer programming, sometimes you
need cleverer math. Sometimes both.
As a trivial example, suppose you're asked to sum the numbers from 1000
to 10**25
Brute force would take a few millenia, as something like
ans = sum(range( BIG ) - sum(range(1000))
But just knowing the math lets you simplify it to something like
ans = (1000 + BIG) * (BIG - 1000) / 2
(give or take a few plus/minus ones)
--
DaveA
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