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DiameterofBinaryTree.java
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43 lines (34 loc) · 949 Bytes
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package t543;
import com.sun.xml.internal.ws.encoding.MtomCodec;
public class DiameterofBinaryTree {
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode() {}
TreeNode(int val) { this.val = val; }
TreeNode(int val, TreeNode left, TreeNode right) {
this.val = val;
this.left = left;
this.right = right;
}
}
int res = 0;
public int help(TreeNode root){
if(root==null){
return 0;
}
int lenLeft = help(root.left);
int lenRig = help(root.right);
res = Math.max(res,lenLeft+lenRig);
return Math.max(lenLeft,lenRig)+1;
}
public int diameterOfBinaryTree(TreeNode root) {
if(root==null)
return 0;
int lenLeft = help(root.left);
int lenRig = help(root.right);
res = Math.max(res,lenLeft+lenRig);
return res;
}
}