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PAREN - COUNT PAREN |
You are given a boolean expression consisting of a string of the symbols 'true', 'false', 'and', 'or', and 'xor'. Count the number of ways to parenthesize the expression such that it will evaluate to true.
"and", "or" and "xor" are of the same priority.
Input
An integer t, 1<=t<=100, denoting the number of testcases, followed by t lines, each containing a space separated string consisting of T, F, and, or and xor of length less than 100 characters
Output
For each string given at input, display a line with the number of ways to parenthesize the expression such that it will evaluate to true.
Example
Input: 1 T and F Output: 0
Added by: | priyamehtanit |
Date: | 2012-01-21 |
Time limit: | 1s-3s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | C++ 4.3.2 CPP |
Resource: | mit tutorial |
hide comments
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2012-08-10 14:12:38 Ehor Nechiporenko
Nice dynamic programming problem |
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2012-05-27 13:31:28 BOND
my O/P is same as @:D ... |
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2013-01-12 10:50:29 :D
Test cases must be extremely weak. I got AC and my program gives the following: 1 1 2 0 5 37 1 0 2 For example for three arguments number of all ways to parenthesize the expressions is 5. See this for some reference: http://en.wikipedia.org/wiki/Catalan_number Last edit: 2012-05-11 19:38:19 |
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2012-05-11 00:22:51 Marcelo
Some inputs and outputs. 9 T or F T xor F T and T and T T and F T or F and T xor F T or T and F xor T and T or F T xor T and F F or F and T T or T or T Outputs 1 1 2 0 7 91 1 0 2 Last edit: 2012-05-11 00:29:00 |
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2012-03-09 05:57:23 Anirban Saha
can you open it for other languages like Java ? |
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2012-03-07 05:09:56 Xusuo J
For Tywan, it is 2. |
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2012-02-02 15:30:16 Tywan
What is the answer for "T and T and T"? Is it 6? |
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2012-01-22 09:54:49 priyamehtanit
yes it does :) |
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2012-01-22 09:43:57 Bharath
does the result fit into a long long? Last edit: 2012-01-22 09:44:12 |