deleteByNode可以提前结束
当删除节点为头结点的时候可以不用进行循环查找要删除节点的前驱节点
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@ -87,6 +87,7 @@ public class SinglyLinkedList {
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if (p == head) {
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if (p == head) {
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head = head.next;
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head = head.next;
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return;
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}
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}
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Node q = head;
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Node q = head;
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