The sum is always 15

Question

Write a program or function that takes an array of non-negative integers as input and outputs a set of vectors/arrays with the elements of the input array in order, split so that each vector sums up to 15. If the sum of the first N elements doesn't "hit 15", then the number that made it pass 15 must be cut off, and the remainder will be the first element of the next vector. This goes on until you reach the end of the input array. If the sum of the final vector is less than 15, then a number must be added at the end to make the sum go up.

I think the rules are more easily understood by looking at the examples:

Input: 3 7 5 10
Output:
3 7 5           <- Sum is 15
10 5            <- 5 is added to make the sum 15

Input: 2 4 5 9 2 3 5 0 2 4 5 0 3
Output:
2 4 5 4          <- Sum 15. 9 is split in two. 
5 2 3 5          <- The first 5 is the remainder of 9
0 2 4 5 0 3 1    <- The last number is added to make the sum 15

Input: 1 1 1            
Output:
1 1 1 12         <- The number 12 is added to make the sum 15

Input: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Output:
1 2 3 4 5
6 7 2           <- 2 is the first part of 8
6 9             <- 6 is the remainder of 8
10 5            <- 5 is first part of 11
6 9             <- 6 is remainder of 11. 9 is first part of 12
3 12            <- 3 is remainder of 12. 12 is first part of 13
1 14            <- 1 is remainder of 13. 14 is 14
15
15              <- 15 is first part of 16
1 14            <- 1 is remainder of 16. 14 is first part of 17
3 12            <- 3 is remainder of 17. 12 is added to make the sum 15

Input: 20 20
Output:
15
5 10           <- 5 is remainder from the first 20
10 5           <- 10 is remainder from second 20. 5 is added to make the sum = 15.

Input: 100
Output
15
15
15
15
15
15
10 5

Both the input and the output format is optional. Whatever is best in your language.

The shortest code in bytes wins.

---

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## [><>](http://esolangs.org/wiki/Fish), 121 bytes

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Answer 1

Java - 229 200 192 181 172 170 168 bytes

Had already begun, not for the win but for the fun :)
Any suggestion is welcome.

Saved 8 bytes thanks to @ThomasKwa
Saved 20 bytes thanks to @corsiKa
Saved 2 bytes thanks to @Ypnypn
Saved 2 bytes thanks to @user902383

String p(int[]a){int c=0,j;String s="";f:for(int i:a){for(j=i;j-->0;)if(++c>14){s+=(i-j)+"\n";c=0;if(j<15){if(j>0)s+=j+" ";c+=j;continue f;}}s+=i+" ";}return s+(15-c);}

170 bytes

String p(int[]a){int c=0,j;String s="";f:for(int i:a){for(j=i;j-->0;){if(++c>14){s+=(i-j)+"\n";c=0;if(j<15){if(j>0)s+=j+" ";c+=j;continue f;}}}s+=i+" ";}return s+(15-c);}

172 bytes

String p(int[]a){int c=0,j;String s="";f:for(int i:a){for(j=i;j>0;){j--;if(++c>14){s+=(i-j)+"\n";c=0;if(j<15){if(j>0)s+=j+" ";c+=j;continue f;}}}s+=i+" ";}return s+(15-c);}

181 bytes

void p(int[]a){int c=0,j;String s="";f:for(int i:a){for(j=i;j>0;){j--;if(++c>14){s+=(i-j)+"\n";c=0;if(j<15){if(j>0)s+=j+" ";c+=j;continue f;}}}s+=i+" ";}System.out.print(s+(15-c));}

192 bytes

void p(int[]a){int c=0,j;String s="";f:for(int i:a){for(j=i;j>0;){j--;c++;if(c==15){s+=(i-j)+"\n";c=0;if(j>=15)continue;if(j>0)s+=j+" ";c+=j;continue f;}}s+=i+" ";}System.out.print(s+(15-c));}

200 bytes

void p(int[]a){int c=0,j;String s="";f:for(int i:a){j=i;while(j>0){j--;c++;if(c==15){s+=(i-j)+"\n";c=0;if(j>=15)continue;else{if(j!=0)s+=j+" ";c+=j;continue f;}}}s+=i+" ";}System.out.print(s+(15-c));}

229 bytes

void p(int[]a){int c=0,j;f:for(int i:a){j=i;while(j>0){j--;c++;if(c==15){System.out.print(i-j+"\n");c=0;if(j>=15){continue;}else{if(j!=0)System.out.print(j+" ");c+=j;continue f;}}}System.out.print(i+" ");}System.out.print(15-c);}

---

String p(int[] a) {
    int c = 0, j;
    String s = "";
    f: for (int i: a) {
        for (j = i; j-- > 0;)
            if (++c > 14) {
                s += (i - j) + "\n";
                c = 0;
                if (j < 15) {
                    if (j > 0) s += j + " ";
                    c += j;
                    continue f;
                }
            }
        s += i + " ";
    }
    return s + (15 - c);
}

Answer 2

Pyth, 37 bytes

K15VQ=+ZNIgZK=-ZK-NZbIZZ)).?N;I>KZ-KZ

Explained

This is an implementation of Noah's equation in Pyth

K15              Store 15 in K (the max) (K is Autoinitializing, no = needed here)
VQ              For N in the evaluated input
  =+ZN           Set Z(Which in pyth defaults to 0) to Z+N
  IgZK           If Z(row total) is greater than or equal to K (row max)
    =-ZK         Set Z to Z-K (How much the max was exceeded)
    -NZ          Implicitly print N-Z
    b            Implicitly print b (in pyth defaults to a newline)
    IZ         If Z > 0 (There was excess to carry to the next row)
      Z          Implicitly print Z (the excess)
  .?N            Else(the current row count is < the max(15)) output the current number
;                Use infinite )'s in place of )) (to save 1 character)
I>KZ             If K > Z (The max is greater than the current row count)
  -KZ           Implicitly print K-Z (The amount needed for the row to equal 15)

This was my first pyth, so feel free to suggest improvements.

Example:

Input

[1, 3, 4, 5, 9, 8]

Output

1
3
4
5
2


7
8

Note: Much thanks to Isaacg for several bytes of size reduction advice and creating pyth in the first place! Please upvote his comments below :)

Answer 3

Python 3 - 1̶7̶7̶ 1̶3̶8̶ 1̶6̶6̶ 1̶3̶3̶ 113

s=0
i=15
p=print
for e in eval(input()):
 if s>=i:p()
 s=s%i+e
 if s>i:s-=i;p(e-s);p();e=s
 p(e)
if s!=i:p(i-s%i)

Edit 5 Truly golfed thanks to @poke *removed line breaks etc

Edit 4 Aliased print, and replaced a = with a -= to save a byte. Thanks to @poke and @elzell. Also moved input eval into for loop to save 2 bytes from assignment

Edit 3 Found savings in different OO inside second if

Edit 2 Fixed bug

Edit 1 Changed the input to be in the form '[1,2,3,4,5...]', and implemented first two comments, big thanks to @Morgan Thrapp

First time poster here. Input is command line with entries separated by spaces, output is entry per line, with a newline between groupings.

Answer 4

Haskell, 126 107 102 100 bytes

[]#c=[]
(h:t)#c|s<0=t#u|s<1=u:t#[]|1<2=(c++[h-s]):(s:t)#[]where s=sum c+h-15;u=c++[h]
(#[]).(++[14])

Usage example: (#[]).(++[14]) $ [1..17] -> [[1,2,3,4,5],[6,7,2],[6,9],[10,5],[6,9],[3,12],[1,14],[15],[15],[1,14],[3,12]]

Edit: @Stewie Griffin helped me saving 19 bytes. Thanks!

Answer 5

CJam, 39 bytes

q~0af*Sf*N*30/{S-N/:,F1$:+-+0+e`W<e~p}/

Test it here.

This feels very suboptimal, but so far all my attempts at a shorter solution have been foiled by the presence of zeros in the input.

Answer 6

Python2_{powered by RegEx}: 158 155 bytes

Made in python with love and almost no math.
Or Regex Math if you will, unary math.
'Real' math used only to 'fix' the last requirement:

If the sum of the final vector is less than 15, then a number must be added at the end to make the sum go up.

Codegolfed:

import re
def f(i):o=[map(len,p.split())for p in re.findall('((?:x *){15}|.+)',' '.join(['x'*c for c in i]))];l=sum(o[-1]);o[-1]+=([],[15-l])[l<15];print o

The way this works is by converting each number N into a string of length N (x chosen as the char to fill up the string) and joining them all into a space separated string. Resulting string is split via RegEx BLACK MAGIC into something like:

['x xx xxx xxxx xxxxx ', 'xxxxxx xxxxxxx xx', 'xxxxxx xxxxxxxxx', 'x']

for an input like: f([1, 2, 3, 4, 5, 6, 7, 8, 10])
That's then split again, and the length of consecutive xes is used to create the numbers again, everything packed nicely in a list comprehension.

Ungolfed:

import re
o = [map(len, p.split()) for p in re.findall('((?:x *){15}|.+)', ' '.join(['x'*c for c in i]))]
l = sum(o[-1])
o[-1] += ([], [15-l])[l<15]
print o

Output:

>>> f([30, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16])
[[15], [15], [1, 2, 3, 4, 5], [6, 7, 2], [6, 9], [15], [1, 14]]

Note: there wasn't enough magic for the 0s so this entry disqualifies

zeros must be included. See the second example

Answer 7

Seriously, 88 bytes

,`'!*'0`M' j0╗`;;;'|ε35*('!=╜+;╗%(' =|('0=|I)`Mεj'|@s`ôl`╝`ö'0@s╛M`Md;Σ35*-;`X``@q`Iƒ@q.

Try it online

It's my first Seriously answer! Now I'm intimately familiar with all the language's shortcomings!

Hex Dump:

2c6027212a2730604d27206a30bb603b3b3b277cee33352a2827213dbd2b3bbb252827203d7c2827303d7c49
29604dee6a277c407360936c60bc609427304073be4d604d643be433352a2d3b60586060407160499f40712e

Explanation:

,`'!*'0`M' j         Replace all the numbers by "0"+"!"*n, separated by " "
0╗                   Initialize an accumulator in register 0
` ... `M             Map the string with the following function:
   ;;;'|ε                Put three extra copies of the character, a pipe, an empty string
   35*                   and a 15 on the stack.
   ('!=                  Move one copy of the character to the top and push 1 if it's a !
   ╜+                    Load the accumulator, add the 1 or 0 from the preceding test
   ;╗                    Make a copy, and save it back to register 0
   %                     Modulo the sum by 15
   (' =|                 Or the result with whether the dug-up character is " "
   ('0=|                 Or the result with whether the dug-up character is "0"
   I                     If we're at " " or "0" or the current sum is not divisible by 15,
                         push empty string, else push "|"
   )                     Bury the new character under the original character.
εj                   Join the list that resulted from the map into a single string.
'|@s                 Resplit the string on occurrences of "|" (after every 15 "!"s)
`ôl`╝                Store a function in register 1 which trims whitespace
                     and returns the length of the remaining string
` ... `M             Map the list with the following function:
   ö                     Trim leading spaces.
   '0@s                  Split the string on occurrence of "0"
   ╛M                    Map the resulting list with the function stored in register 1
d;                   Push the last sublist from the resulting list and make a copy.
Σ                    Find the sum of the list.
35*-                 Subtract it from 15
;`X``@q`Iƒ           Duplicate it, drop it if it's zero, put it in the list otherwise.
@q.                  Put the list back in the big list and print it.

Answer 8

Javascript, 138 128 bytes

i=>eval("for(o=z=n='',m=15,t=q=0;q<i.length;q++)(t+=c=+i[q])>=m?(t-=m,z+=c-t,o+=z+`\n`,z=t>0?t+' ':n):z+=c+' ';t<m?o+z+(m-t):o")

With whitespace:

i => eval("
  for(o=z=n='', m=15, t=q=0; q < i.length; q++)
    (t+=c=+i[q])>=m
      ?(
        t-=m,
        z+=c-t,
        o+=z+`\n`,
        z=t>0?t+' ':n)
      :
        z+=c+' '
    ;
  t<m ? o+z+(m-t) : o
")

Example:

Assign the function to a variable

sumFifteen=i=>eval("for(o=z=n='',m=15,t=q=0;q<i.length;q++)(t+=c=+i[q])>=m?(t-=m,z+=c-t,o+=z+`\n`,z=t>0?t+' ':n):z+=c+' ';t<m?o+z+(m-t):o")

Then evaluate like so:

console.log(sumFifteen([1,4,11,4,5]))

1 4 10
1 4 5 5

Revision history:

12/3/2015 00:02 - Thanks to user81655(+1 him in the comments) for 10 byte improvement

12/2/2015 21:44 - Switched to use functional style in-order to reduce size.

Answer 9

Python 3: 139 bytes

Slightly different approach than the other answer. Produces the actual output from the question because I initially assumed that was a requirement.

def f(l):
 m=15;r,s=sum(l)%m,0
 if r:l+=[m-r]
 while l:
  x=l.pop(0)
  if s+x>m:y=m-s;l[0:0]=[x-y];x=y
  s+=x;print(x,end=' \n'[s==m]);s%=m

Example usage:

>>> f([2, 4, 5, 9, 2, 3, 5, 0, 2, 4, 5, 0, 3])
2 4 5 4
5 2 3 5
0 2 4 5 0 3 1

Answer 10

Perl, 86 bytes

#!perl -p
s|\d+( ?)|($i+=$&)<15?$&:($a=$&-($i%=15)).$/.($&>$a&&$&-$a.$1)|ge;$\=$".(15-$i)if$i

Counting the shebang as three, input is taken from stdin, space separated.

---

Sample Usage

$ echo -n 2 4 5 9 2 3 5 0 2 4 5 0 3 | perl sum15.pl
2 4 5 4
5 2 3 5
0 2 4 5 0 3 1

Answer 11

R, 155 bytes

n=scan();while(S<-sum(n)){C=cumsum(n);if(S>14){w=which(C>14)[1];N=n[1:w];n=n[-(1:w)];r=C[w]-15;N[w]=N[w]-r;if(r)n=c(r,n);cat(N,"\n")}else{cat(n,15-S);n=0}}

With indents and linebreaks:

n=scan()
while(S<-sum(n)){
     C=cumsum(n)
     if(S>14){
         w=which(C>14)[1]
         N=n[1:w]
         n=n[-(1:w)]
         r=C[w]-15
         N[w]=N[w]-r
         if(r) n=c(r,n)
         cat(N,"\n")
         }else{
            cat(n,15-S)
             n=0
             }
      }

Usage:

> n=scan();while(S<-sum(n)){C=cumsum(n);if(S>14){w=which(C>14)[1];N=n[1:w];n=n[-(1:w)];r=C[w]-15;N[w]=N[w]-r;if(r)n=c(r,n);cat(N,"\n")}else{cat(n,15-S);n=0}}
1: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
18: 
Read 17 items
1 2 3 4 5 
6 7 2 
6 9 
10 5 
6 9 
3 12 
1 14 
15 
15 
1 14 
3 12
> n=scan();while(S<-sum(n)){C=cumsum(n);if(S>14){w=which(C>14)[1];N=n[1:w];n=n[-(1:w)];r=C[w]-15;N[w]=N[w]-r;if(r)n=c(r,n);cat(N,"\n")}else{cat(n,15-S);n=0}}
1: 20 20
3: 
Read 2 items
15 
5 10 
10 5
> n=scan();while(S<-sum(n)){C=cumsum(n);if(S>14){w=which(C>14)[1];N=n[1:w];n=n[-(1:w)];r=C[w]-15;N[w]=N[w]-r;if(r)n=c(r,n);cat(N,"\n")}else{cat(n,15-S);n=0}}
1: 10 5
3: 
Read 2 items
10 5 
> n=scan();while(S<-sum(n)){C=cumsum(n);if(S>14){w=which(C>14)[1];N=n[1:w];n=n[-(1:w)];r=C[w]-15;N[w]=N[w]-r;if(r)n=c(r,n);cat(N,"\n")}else{cat(n,15-S);n=0}}
1: 2 4 5 9 2 3 5 0 2 4 5 0 3
14: 
Read 13 items
2 4 5 4 
5 2 3 5 
0 2 4 5 0 3 1

Answer 12

Python 2, 117 bytes

i=input()
while i:
 s=15;r=[]
 while s>0:n=i.pop(0)if i else s;s-=n;r+=[n]if s>=0 else[n+s]
 if s<0:i=[-s]+i
 print r

Takes input as list:

>>[2,4,5,9,2,3,5,0,2,4,5,0,3]
[2, 4, 5, 4]
[5, 2, 3, 5]
[0, 2, 4, 5, 0, 3, 1]

Answer 13

Perl, 76 bytes

Includes +3 for -p (normally +1, but +3 to play fair with the other perl solution)

Run with the input on STDIN (final newline on input is optional, but MUST be absent for the empty input)

sum15.pl <<< "1 2 3"

sum15.pl:

#!/usr/bin/perl -p
s/$/ 15/;s/\d+/1x$&/eg;s/( *1){15}\K ?/
/g;s/
1*
*$//;s/1+|\B/length$&/eg

Look ma, no calculations whatsoever...

Answer 14

Java - 158 155 bytes

Lambda version of https://codegolf.stackexchange.com/a/65590/46866 by yassin-hajaj, Not sure if a valid submission, but dont have enough rep to add a comment on the linked answer. Counted using http://meta.codegolf.stackexchange.com/questions/4944/byte-counter-snippet

a->{int c=0,j;String s="";f:for(int i:a){for(j=i;j-->0;)if(++c>14){s+=(i-j)+"\n";c=0;if(j<15){if(j>0)s+=j+" ";c+=j;continue f;}}s+=i+" ";}return s+(15-c);}

158 Bytes

a->{int c=0,j;String s="";f:for(int i:a){for (j=i;j-->0;)if(++c>14){s+=(i-j)+ "\n";c=0;if(j<15){if(j>0)s+=j+" ";c+=j;continue f;}}s+=i+ " ";}return s+(15-c);}

Ungolfed

a ->
    {
        int c=0, j;
        String s = "";
        f:
        for (int i : a) {
            for (j = i; j-- > 0; )
                if (++c > 14) {
                    s += (i - j) + "\n";
                    c = 0;
                    if (j < 15) {
                        if (j > 0) s += j + " ";
                        c += j;
                        continue f;
                    }
                }
            s += i + " ";
        }
        return s + (15 - c);
    }

can be used like

Function<int[], String> func =a->{int c=0,j;String s="";f:for(int i:a){for (j=i;j-->0;)if(++c>14){s+=(i-j)+ "\n";c=0;if(j<15){if(j>0)s+=j+" ";c+=j;continue f;}}s+=i+ " ";}return s+(15-c);};
System.out.println(func.apply(new int[]{2, 4, 5, 9, 2, 3, 5, 0, 2, 4, 5 ,0 ,3}));