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Subtree of Another Tree
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10 mins
31 upvotes
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Subtree of Another Tree

Contributed by
Arindam Majumder
Easy
yellow-spark
0/40
Avg time to solve 10 mins
Success Rate 90 %
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31 upvotes

Problem Statement

Given two binary trees T and S, check whether tree S has exactly the same structure and node values with a subtree of T, i.e., check if tree S is a subtree of the tree T.

A subtree of a tree T is a tree S consisting of a node in T and all of its descendants in T. The subtree corresponding to the root node is the entire tree; the subtree corresponding to any other node is called a proper subtree.

Detailed explanation ( Input/output format, Notes, Constraints, Images )
Sample Input 1:
2
1 2 3 4 5 6 7 -1 -1 -1 -1 -1 -1 -1 -1
3 6 7 -1 -1 -1 -1
3 4 5 1 2 -1 -1 -1 -1 0 -1 -1 -1
4 1 2 -1 -1 -1 -1
Sample Output 1:
true
false
Explanation of Sample Input 1:

Sample Input 1

For the first test case, the second tree is a subtree of the first tree as the second tree has exactly the same structure and node values with a subtree of the first tree.

For the second test case, the second tree is not a subtree of the first tree because node 2 in the first tree has 1 child having a value 0, whereas node 2 in the second tree doesn’t have any child.
Sample Input 2:
2
26 10 3 4 6 -1 3 -1 30 -1 -1 -1 -1 -1 -1
10 4 6 -1 30 -1 -1 -1 -1
3 4 5 1 2 -1 -1 -1 -1 -1 -1
4 1 -1 -1 -1
Sample Output 2:
true
false
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