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
hide comments
daniel5399:
2017-11-09 15:47:52
Nice problem! Last edit: 2017-11-09 15:48:20 |
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deerishi:
2016-10-05 20:47:22
Nice problem!! O(n)! |
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rohitranjan017:
2016-08-18 05:48:37
Easy recursion !! AC in 0.00 in first go. |
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cnexans:
2016-08-07 07:03:09
I loved this question, although the test cases are weak. I have read the comments and tried to find a non recursive solution, but after a couple of WA I decided to do it recursively then I've got AC. Last edit: 2016-08-07 07:05:13 |
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hash7:
2016-06-30 16:08:10
Loved the question :D .. But took me 4 hrs to solve :( ... No recursion needed |
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minhthai:
2016-02-04 08:21:19
u can use stack if recursion tle |
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Zhaofeng:
2015-09-30 11:37:52
Nice question! Took me a bit of thinking but got AC in one go. I probably should practise more. |
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goku:
2015-09-26 09:53:55
it's weird my code gives right on 100's of test cases and the "stereotype"code gives RE for nnlnnlnlll still stereotype passes!!!??? |
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:.Mohib.::
2015-07-08 21:43:58
Nice One..!! |
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r0bo_dart:
2015-06-18 12:54:04
nice question... AC at one go. |
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 |