private Result recursiveFind(ListNode tail, ListNode head) {
if (tail == null) {
return new Result(head, true);
}
Result result = recursiveFind(tail.next, head);
if (result.isTerminated) {
return result;
} else {
if (tail == result.modifiedHead || tail.next == result.modifiedHead) {
result.isTerminated = true;
return result;
}
if (result.result) {
if (tail.val != result.modifiedHead.val) {
result.modifiedHead = null;
result.result = false;
result.isTerminated = true;
return result;
} else {
result.modifiedHead = result.modifiedHead.next;
result.result = true;
result.isTerminated = false;
return result;
}
}
}
return result;
}
public Result exe(String src) {
Result res = new Result();
long start = System.currentTimeMillis();
try {
List lists = Parser.parse(src);
res.result = new Begin().invoke(global(), lists).toString();
} catch (ParseException pe) {
res.result = "Syntax Error -> " + pe.getMessage();
} catch (EvalException ee) {
res.result = "Runtime Error -> " + ee.getMessage();
} catch (RuntimeException re) {
res.result = "Fatal Error -> " + re.getMessage();
re.printStackTrace();
}
res.callcnt = sand.get().getCallNum();
res.calltime = System.currentTimeMillis() - start;
writer().flush();
return res;
}
public static Result isPalindromRecurse(SNode n, int len) {
assert (len == 2) : "Length reaches" + len;
if (n == null || len == 0) {
return new Result(null, true);
} else if (len == 1) {
return new Result(n.next, true);
} else if (len == 2) {
return new Result(n.next.next, n.key == n.next.key);
}
Result res = isPalindromRecurse(n.next, len - 2);
if (!res.result || res.node == null) {
return res;
} else {
res.result = n.key == res.node.key;
res.node = res.node.next;
return res;
}
}
