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NICEBTRE - Nice Binary Trees |
Binary trees can sometimes be very difficult to work with. Fortunately, there is a class of trees with some really nice properties. A rooted binary tree is called “nice”, if every node is either a leaf, or has exactly two children.
For example, the following tree is nice,
but the following tree is not.
The leaves of a nice binary tree are labeled by the letter ‘l’, and other nodes are labeled by the letter ‘n’.
Given the pre-order traversal of a nice binary tree, you are required to find the depth of the tree.
Notes:
- The depth of a tree is defined as the length of the longest path with one end at the root.
- The pre-order traversal of the tree in the first image above produces the string “nlnnlll”.
Input
The first line contains the number of test cases T. T lines follow. Each line contains a string, which represents the pre-order traversal of a “nice” binary tree. Leaves are represented by the letter ‘l’ and other nodes by the letter ‘n’. The input is guaranteed to be the preorder traversal of a nice binary tree.
Output
Output one line for each test case, containing a single integer, the depth of tree.
Constraints
0 < T < 20
Length of the input string in each test case is at most 10000.
Example
Input: 3 l nlnll nlnnlll Output: 0 2 3
Added by: | Anil Shanbhag |
Date: | 2013-01-17 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
hide comments
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2014-07-02 14:43:58 vikrant
Recursion :) |
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2014-06-05 09:07:24 heatOn
Nice One :) |
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2014-05-18 10:00:19 Saurav Shekhar
I am unable to see the images. Maybe because they are not there at the original page anymore. @problem setter please see to it. You can use the images hosted at this link http://www.bnuoj.com/contest/problem_show.php?pid=28810 --ans(Francky)--> I can do it. Done. Last edit: 2014-05-18 10:51:29 |
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2014-04-21 16:48:49 sarelfeniel
Great problem. Nice and easy but still satisfying. |
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2014-02-19 09:04:03 codestorm
recursion |
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2014-01-22 14:51:41 Piyush Raman Srivastava
common interview question!! |
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2013-12-23 14:50:16 Anant Kumar
nice one. |
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2013-12-23 10:26:35 Ashwini
giving all answers right in my pc. why wa here?????????? any tricky test cases? Help me.... <snip> Last edit: 2023-05-22 13:44:39 |
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2013-10-26 12:39:31 prudhvi
Easy one but before attempting check the definition of pre-order traversal |
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2013-10-19 20:52:06 Prakhar Gupta
WA after running(5), any tricky cases??? |