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// Quick sort
QS(ret) >< [] => ret~[];
QS(ret) >< (int x):xs =>
Part(x, left, right)~xs,
QS(cntl)~left, QS(cntr)~right,
Append(ret, x:cntl)~cntr;
// Note: `Append' is implemented as built-in.
// Apnd(ret, a)~b --> ret ~ b@a
//Apnd(ret, a) >< [] => ret~a;
//Apnd(ret, a) >< x:xs => ret~(x:cnt), Apnd(cnt, a)~xs;
Part(int x, a, b) >< [] => a~[], b~[];
Part(int x, a, b) >< (int y):ys
| y<x => b~(y:cnt), Part(x, a, cnt)~ys
| _ => a~(y:cnt), Part(x, cnt, b)~ys;
const LIST_ELEM=800000;
MkRandList(ret) >< (int n)
| n>0 => ret~(rd:cnt), MkRandList(cnt)~(n-1)
where rd=rand(10000)
| _ => ret~[];
MkRandList(cnt)~(LIST_ELEM),
QS(ret)~cnt;
ret;
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