Friday's Coding Challenge
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What's the smallest code you can come up with to find the n smallest numbers in a random sample of m numbers where n < m. Any language, speed is not an issue.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
APL:
f←{⍺↑⍵⌷⍨⍋⍵}
call like
n f (sample vector)
eg
f←{⍺↑⍵⌷⍨⍋⍵}
{f}
xx←20?30 // 20 different ints in 1-30
(23 28 14 12 10 8 15 3 2 7 26 4 20 29 24 30 25 18 21 27)
10 f xx // smallest 10 values in xx
(2 3 4 7 8 10 12 14 15 18)This is in my personal dialect since I don't have a licensed major APL on this machine, but the function is essentially the same in normal variants.
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What's the smallest code you can come up with to find the n smallest numbers in a random sample of m numbers where n < m. Any language, speed is not an issue.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
Smallest in source lines or smallest in compiled output?
Need custom software developed? I do custom programming based primarily on MS tools with an emphasis on C# development and consulting. I also do Android Programming as I find it a refreshing break from the MS. "And they, since they Were not the one dead, turned to their affairs" -- Robert Frost
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Are we talking about integers?
Based on the way the task was phrased, I think it's safe to assume we're talking numeric values, but the intrinsic type is of no real consequence in the actual mechanics of the task.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997 -
What's the smallest code you can come up with to find the n smallest numbers in a random sample of m numbers where n < m. Any language, speed is not an issue.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
I have assumed a list of integers
List Numbers = new List();
Random r = new Random(10);for (int i = 0; i < 10; i++)
{
Numbers.Add(r.Next(0, 100));
}Numbers.Sort();
var Values = Number.Take(5);Lobster Thermidor aux crevettes with a Mornay sauce, served in a Provençale manner with shallots and aubergines, garnished with truffle pate, brandy and a fried egg on top and Spam - Monty Python Spam Sketch
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What's the smallest code you can come up with to find the n smallest numbers in a random sample of m numbers where n < m. Any language, speed is not an issue.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
int[] smallest (int[] args, int count) {
int[] copy = java.util.Arrays.copyOf(args,args.length);
java.util.Arrays.sort(copy);
return java.util.Arrays.copyOf(args, count);
}If you don't need it to preserve the original order, then you can drop the first line. This is safe for
count > args.length.
Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett
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Assuming sample is an array of numbers:
int smallest = Array.Sort(sample)[0];
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997You may want to read the specs again.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
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Smallest in source lines or smallest in compiled output?
Need custom software developed? I do custom programming based primarily on MS tools with an emphasis on C# development and consulting. I also do Android Programming as I find it a refreshing break from the MS. "And they, since they Were not the one dead, turned to their affairs" -- Robert Frost
Source.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
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I have assumed a list of integers
List Numbers = new List();
Random r = new Random(10);for (int i = 0; i < 10; i++)
{
Numbers.Add(r.Next(0, 100));
}Numbers.Sort();
var Values = Number.Take(5);Lobster Thermidor aux crevettes with a Mornay sauce, served in a Provençale manner with shallots and aubergines, garnished with truffle pate, brandy and a fried egg on top and Spam - Monty Python Spam Sketch
That's 1 line too many ;)
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
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The funny thing was that when I drafted the question I was thinking about all the smart comments that would be made and so I added "programming" before the word "language". But then thought: Nah - no one would answer with an English sentence. :doh:
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
Chris Maunder wrote:
I was thinking about all the smart comments that would be made
Well Chris, you remember how the last challenge went. :)
"the meat from that butcher is just the dogs danglies, absolutely amazing cuts of beef." - DaveAuld (2011)
"No, that is just the earthly manifestation of the Great God Retardon." - Nagy Vilmos (2011) "It is the celestial scrotum of good luck!" - Nagy Vilmos (2011) -
What's the smallest code you can come up with to find the n smallest numbers in a random sample of m numbers where n < m. Any language, speed is not an issue.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
As an accountant I would suggest...
Range("A:A").Select ActiveWorkbook.Worksheets("Sheet1").Sort.SortFields.Clear ActiveWorkbook.Worksheets("Sheet1").Sort.SortFields.Add Key:=Range("A1"), SortOn:=xlSortOnValues, Order:=xlAscending, DataOption:=xlSortNormal With ActiveWorkbook.Worksheets("Sheet1").Sort .SetRange Range("A:A") .Header = xlNo .MatchCase = False .Orientation = xlTopToBottom .SortMethod = xlPinYin .Apply End With Range("C1").Select ActiveCell.FormulaR1C1 = "=RC\[-2\]" Range("C2").Select ActiveCell.FormulaR1C1 = "=COUNTIF(R\[-1\]C\[-2\]:R\[17\]C\[-2\],R\[-1\]C)" Range("C3").SelectThat that is accountants all over!
--------------------------------- I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave CCC Link[^] English League Tables - Live
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As an accountant I would suggest...
Range("A:A").Select ActiveWorkbook.Worksheets("Sheet1").Sort.SortFields.Clear ActiveWorkbook.Worksheets("Sheet1").Sort.SortFields.Add Key:=Range("A1"), SortOn:=xlSortOnValues, Order:=xlAscending, DataOption:=xlSortNormal With ActiveWorkbook.Worksheets("Sheet1").Sort .SetRange Range("A:A") .Header = xlNo .MatchCase = False .Orientation = xlTopToBottom .SortMethod = xlPinYin .Apply End With Range("C1").Select ActiveCell.FormulaR1C1 = "=RC\[-2\]" Range("C2").Select ActiveCell.FormulaR1C1 = "=COUNTIF(R\[-1\]C\[-2\]:R\[17\]C\[-2\],R\[-1\]C)" Range("C3").SelectThat that is accountants all over!
--------------------------------- I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave CCC Link[^] English League Tables - Live
My eyes! They burn!
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
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As an accountant I would suggest...
Range("A:A").Select ActiveWorkbook.Worksheets("Sheet1").Sort.SortFields.Clear ActiveWorkbook.Worksheets("Sheet1").Sort.SortFields.Add Key:=Range("A1"), SortOn:=xlSortOnValues, Order:=xlAscending, DataOption:=xlSortNormal With ActiveWorkbook.Worksheets("Sheet1").Sort .SetRange Range("A:A") .Header = xlNo .MatchCase = False .Orientation = xlTopToBottom .SortMethod = xlPinYin .Apply End With Range("C1").Select ActiveCell.FormulaR1C1 = "=RC\[-2\]" Range("C2").Select ActiveCell.FormulaR1C1 = "=COUNTIF(R\[-1\]C\[-2\]:R\[17\]C\[-2\],R\[-1\]C)" Range("C3").SelectThat that is accountants all over!
--------------------------------- I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave CCC Link[^] English League Tables - Live
That's uglier than my photo!
Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett
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Chris Maunder wrote:
I was thinking about all the smart comments that would be made
Well Chris, you remember how the last challenge went. :)
"the meat from that butcher is just the dogs danglies, absolutely amazing cuts of beef." - DaveAuld (2011)
"No, that is just the earthly manifestation of the Great God Retardon." - Nagy Vilmos (2011) "It is the celestial scrotum of good luck!" - Nagy Vilmos (2011)Yes, like the weekly surveys, they are merely pedant fodder. :)
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
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I took you at your word...See Below :)
--------------------------------- I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave CCC Link[^] English League Tables - Live
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My eyes! They burn!
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
Functional but ugly. I have dated some like that!
--------------------------------- I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave CCC Link[^] English League Tables - Live
-
Yes, like the weekly surveys, they are merely pedant fodder. :)
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
If you don't feed the pedants, they will revolt!
--------------------------------- I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave CCC Link[^] English League Tables - Live
-
What's the smallest code you can come up with to find the n smallest numbers in a random sample of m numbers where n < m. Any language, speed is not an issue.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
-
You may want to read the specs again.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
I assumed
nwas 1. :)".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997 -
What's the smallest code you can come up with to find the n smallest numbers in a random sample of m numbers where n < m. Any language, speed is not an issue.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
Is this somehow related to the curious error page I received this morning from Web04? The one featuring ravenous hamsters obviously recovering from a three day methamphetamine/ethanol binge?
Will Rogers never met me.
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What's the smallest code you can come up with to find the n smallest numbers in a random sample of m numbers where n < m. Any language, speed is not an issue.
cheers, Chris Maunder The Code Project | Co-founder Microsoft C++ MVP
In English (again): :D Assume m = A*n + B. If m >> n, then it might be easier to first sort each of the A n-segments and B segment separately. Compare the first element of the A-1 lists and B to the last element of the first A list (or to the last element of the smallest starting A-list) and eliminate all the A segments that are greater than that. Then repeat the process again using n elements selected vertically.
