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SubtreeSolution.java

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/**

* 剑指Offer，树的子结构

*/

public class SubtreeSolution {

public boolean HasSubtree(TreeNode root1,TreeNode root2) {

if (root1 == null || root2 == null) {

return false;

}

return isSubTree(root1, root2) || isSubTree(root1.left, root2) || isSubTree(root1.right, root2);

}

public boolean isSubTree(TreeNode root1, TreeNode root2) {

if (root2 == null) {

return true;

}

if (root1 == null ){

return false;

}

if (root1.val != root2.val) {

return false;

}

return isSubTree(root1.left, root2.left) && isSubTree(root1.right, root2.right);

}

}