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| public class AddTwoNumbers {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
if (l1 == null) {
return l2;
}
if (l2 == null) {
return l1;
}
boolean inc = false;
int sum = 0;
ListNode result = l1;
ListNode tmp;
if (getLength(l1) >= getLength(l2)) {
result = l1;
tmp = l2;
} else {
result = l2;
tmp = l1;
}
ListNode cursor = result;
while (tmp != null && tmp.next != null) {
sum = result.val + tmp.val + (inc ? 1 : 0);
result.val = sum % 10;
inc = (sum > 9);
result = result.next;
tmp = tmp.next;
}
sum = result.val + tmp.val + (inc ? 1 : 0);
result.val = sum % 10;
inc = (sum > 9);
while (result.next != null) {
result = result.next;
sum = result.val + (inc ? 1 : 0);
result.val = sum % 10;
inc = (sum > 9);
}
if (inc) {
result.next = new ListNode(1);
}
return cursor;
}
private int getLength(ListNode list) {
ListNode cursor = list;
int len = 0;
while (cursor != null) {
len++;
cursor = cursor.next;
}
return len;
}
}
|