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LinkListCommonNode.java

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LinkListCommonNode.java

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/**

* 剑指Offer，两个链表的第一个公共节点

*/

/*

public class ListNode {

int val;

ListNode next = null;

ListNode(int val) {

this.val = val;

}

}*/

public class LinkLisdCommonNode {

public ListNode FindFirstCommonNode(ListNode pHead1, ListNode pHead2) {

int len1 = 0, len2=0;

ListNode p1 = pHead1, p2 = pHead2;

while (p1 != null) {

len1++;

p1 = p1.next;

}

while (p2 != null) {

len2++;

p2 = p2.next;

}

p1 = pHead1;

p2 = pHead2;

if (len1 > len2) {

for (int i = 0; i < len1 - len2; i++) {

p1 = p1.next;

}

}else {

for (int i = 0; i < len2 - len1; i++) {

p2 = p2.next;

}

}

while (p1 != null) {

if (p1 == p2) {

return p1;

}

p1 = p1.next;

p2 = p2.next;

}

return null;

}

}