# Find the nearest common parent node of a binary tree two node

Source: Internet
Author: User

`1 //find the nearest public parent node in a tree2  Public classLCA {3     Static BooleanFlag[] =New Boolean[2];;4     5      Public StaticTreeNode Findlowestcommonancestor (TreeNode Head, TreeNode first, TreeNode second) {6 Travel (head, first, second);7         if(Flag[0] = =true&& flag[1] = =true)//two nodes are present8             returnLowestcommonancestor (head, first, second);9         Else Ten             return NULL; One     } A      -      Public Static voidTravel (TreeNode Head, TreeNode first, TreeNode second) { -         if(Head = =NULL) the             return; -          -         if(Head.value = =first.value) -Flag[0] =true; +         if(Head.value = =second.value) -FLAG[1] =true; + Travel (Head.left, first, second); A Travel (Head.right, first, second); at     } -      -      Public StaticTreeNode Lowestcommonancestor (TreeNode Head, TreeNode first, TreeNode second) { -         if(Head = =NULL) -             return NULL; -          in         //First Root traversal -         if(Head.value = = First.value | | head.value = =second.value) to             returnHead;  +TreeNode left =Lowestcommonancestor (Head.left, first, second); -TreeNode right =Lowestcommonancestor (Head.right, first, second); the         if(Left! =NULL) && (Right! =NULL)) { *             returnhead; \$         }Panax Notoginseng         returnLeft! =NULL?Left:right; -     } the      +      Public Static voidMain (string[] args) { ATreeNode Node1 =NewTreeNode (1); theTreeNode Node2 =NewTreeNode (2); +TreeNode Node3 =NewTreeNode (3); -TreeNode node4 =NewTreeNode (4); \$TreeNode NODE5 =NewTreeNode (5); \$TreeNode Node6 =NewTreeNode (6); -TreeNode Node7 =NewTreeNode (7); -Node1.left =Node2; theNode1.right =Node3; -Node2.left =Node4;WuyiNode2.right =Node5; theNode4.right =Node6; -TreeNode result = Findlowestcommonancestor (Node1, Node6, NODE5);//2 Wu //TreeNode result = Findlowestcommonancestor (Node1, Node1, node2);//1 - //TreeNode result = Findlowestcommonancestor (Node1, Node1, node7);//NULL About          \$SYSTEM.OUT.PRINTLN (Result! =NULL?result.value:result); -     } - } -  A classTreeNode { + TreeNode left; the TreeNode right; -     intvalue; \$      theTreeNode (intvalue) { the          This. Value =value; the     } the}`

Find the nearest common parent node of a binary tree two node

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