with test as (select rownum id, regexp_substr('1,2,3,4', '[^,]+',1,rownum) n from dual connect by rownum < 5)
select case when end_out1=24 then '('||'('||n1||f1||n2||')'||f2||n3||')'||f3||n4||'='||'24'
when end_out2=24 then '('||n1||f1||n2||')'||f3||'('||n3||f2||n4||')'||'='||'24'
when end_out3=24 then n1||f3||'('||'('||n2||f1||n3||')'||f2||n4||')'||'='||'24'
end
from
( select x2.*,d.n n4,f3,
decode(f3, '+', c123 + d.n, '-', c123 - d.n, '*', c123 * d.n, '/', c123 / d.n) end_out1,
decode(f3, '+', c12 + decode(f2, '+', n3 + d.n, '-', n3 - d.n, '*', n3 * d.n, '/', n3 / d.n),
'-', c12 - decode(f2, '+', n3 + d.n, '-', n3 - d.n, '*', n3 * d.n, '/', n3 / d.n),
'*', c12 * decode(f2, '+', n3 + d.n, '-', n3 - d.n, '*', n3 * d.n, '/', n3 / d.n),
'/', c12 / decode(f2, '+', n3 + d.n, '-', decode(n3,d.n,null,n3-d.n), '*', n3 * d.n, '/', n3 / d.n) ) end_out2,
decode(f3, '+', n1 + decode(f2, '+', c23 + d.n, '-', c23 - d.n, '*', c23 * d.n, '/', c23 / d.n),
'-', n1 - decode(f2, '+', c23 + d.n, '-', c23 - d.n, '*', c23 * d.n, '/', c23 / d.n),
'*', n1 * decode(f2, '+', c23 + d.n, '-', c23 - d.n, '*', c23 * d.n, '/', c23 / d.n),
'/', n1 / decode(f2, '+', decode(c23,-1*d.n,null,c23+d.n),
'-', decode(c23,d.n,null,c23-d.n),
'*', decode(c23,0,null,c23 * d.n),
'/', decode(c23,0,null,c23 / d.n) )) end_out3
from (select id1,id2,c.id id3,
x1.n1,x1.n2,c.n n3,
f1,f2,x1.c12,
decode(f2, '+', c12+ c.n, '-', c12 - c.n, '*', c12 * c.n, '/', c12 / c.n) c123,
decode(f1, '+', n2+ c.n,'-', n2- c.n, '*', n2* c.n, '/', n2 / c.n) c23
from (select a.id id1,b.id id2,
a.n n1, b.n n2,
f1,
decode(f1, '+', a.n + b.n, '-', a.n - b.n, '*', a.n * b.n, '/', a.n / b.n) c12
from test a,
test b,
(select substr('+-*/', rownum, 1) f1 from dual connect by rownum < 5) x
where a.id <> b.id) x1,
test c,
(select substr('+-*/', rownum, 1) f2 from dual connect by rownum < 5) x
where x1.id1 <> c.id
and x1.id2 <> c.id)x2,
test d,
(select substr('+-*/', rownum, 1) f3 from dual connect by rownum < 5) x
where id1<>d.id and id2<>d.id and id3<>d.id ) x3
where end_out1=24
or end_out2=24
or end_out3=24
