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class Solution {

public boolean isSubStructure(TreeNode A, TreeNode B) {

if(A==null && B==null) return true;

if(A==null)

{

return false;

}

if(B==null)

{

return false;

}

if(find(A,B))

{

return true;

}

if(isSubStructure(A.left,B))

{

return true;

}

if(isSubStructure(A.right,B))

{

return true;

}

return false;

}

public boolean find(TreeNode A,TreeNode B)

{

if(A==null&&B==null)

{

return true;

}

if(A==null)

{

return false;

}

if(B==null)

{

return true;

}

if(A.val==B.val)

{

return find(A.left,B.left)&&find(A.right,B.right);

}

else

{

return false;

}

// return true;

}

}