How to make cycle over cycles in Java?
- by Roman
I would like to make a cycle over the following elements:
[1,2,11,12,21,22,111,112,121,122,....,222222]
or for example
[1,2,3,11,12,13,21,22,23,31,32,33,111,112,113,... 333333333]
How can I make it in Java? In my particular case I use 4 digits (1,2,3,4) and the length of the last number can be from 1 to 10.
I managed to do it in Python and PHP. In the first case I used list over lists. I started from [[1],[2],] then for every element of the list I added 1 and 2, so I got [[1,1],[1,2],[2,1],[2,2]] and so on:
nchips = sum(chips)
traj = [[]]
last = [[]]
while len(last[0]) < nchips:
newlast = []
for tr in last:
for d in [1,2,3,4]:
newlast.append(tr + [d])
last = newlast
traj += last
When I did it in PHP I used number with base 3. But it was a tricky and non elegant solution.
for ($i=-1; $i<=$n; $i+=1) {
if ($i>-1) {
$n5 = base_convert($i,10,5);
$n5_str = strval($n5);
$tr = array();
$found = 0;
for ($j=0; $j<strlen($n5_str); $j+=1) {
$k = $n5_str[$j];
if ($k==0) {
$found = 1;
break;
}
array_push($tr,$k);
}
if ($found==1)
continue;
} else {
$tr = array();
}
}
Can it be done easily in Java?
