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decide if T2 is subTree of T1
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| public boolean contain(TreeNode t1, TreeNode t2){ | |
| if(t2==null) return true// null tree is alway a subtree | |
| return subTree(t1,t2) | |
| } | |
| public boolean subTree(TreeNode t1, TreeNode t2){ | |
| if(t1==null) return false// big tree is null, t2 must not be a subtree | |
| if (t1.data=t2.data){ | |
| if(match(t1, t2)) return true | |
| } | |
| return subTree(t1.left, t2)||(t1.right, t2) | |
| } | |
| public boolean match(TreeNode t1, TreeNdoe t2){ | |
| if(t1==null&&t2==null) return true | |
| if(t1==null||t2==null) return false | |
| if(t1.data!=t1.data) return false | |
| return matchTree(t1.left, t2.left)&&(t1.right, t2.right) | |
| } |
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