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RemoveByRatio.java
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46 lines (43 loc) · 1.08 KB
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package linkedlist;
import linkedlist.common.Node;
import org.junit.Test;
/**
* 根据链表长度n，删除链表a/b处的结点，向上取整。
* Created by LXF on 2016/7/27.
*/
public class RemoveByRatio {
public Node Remove(Node head, int a, int b) {
if (a < 1 || a > b) {
return head;
}
int n = 0;
Node cur = head;
while (cur != null) {
n++;
cur = cur.next;
}
n = (int) Math.ceil((double) (a * n) / (double) b);
if (n == 1) {
head = head.next;
}
if (n > 1) {
cur = head;
while (--n != 1) {
cur = cur.next;
}
cur.next = cur.next.next;
}
return head;
}
@Test
public void test() {
Node head = new Node(2);
head.add(3);
head.add(5);
head.add(8);
head.add(6);
RemoveByRatio removeByrRatio = new RemoveByRatio();
Node res = removeByrRatio.Remove(head, 3, 4);
System.out.println(res.next.next.next.value);
}
}