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ANALYS_T - Program Analyser (tutorial) |
Input
A Program which has the following format:
<Program>::=<sentence><line break>{<sentence><line break>}
<setence>::=<level><space><body>
<body>::=<addition> | <output> | <goto> | <condition> | <end>
<addition>::=<variable>+<integer>
<output>::=<variable>?
<goto>::=GO<space><level>
<condition>::=IF<space><variable>=<integer><space><goto>
<end>::=END
<variable>::=<character>
<level>::=<integer>
<integer>::=<digit>{<digit>}
<character>::=A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z
<digit>::= 0|1|2|3|4|5|6|7|8|9
<line break>::=(ASCII 10)
<space>::=(ASCII 32)
The program runs following the following rules:
- Program starts from the sentence whose level is minimum, and executed by the level from low to high except that the sentence is<goto>or<condition>.
- All variables are initialized to 0.
- <Addition>means<variable>+=<integer>in C++.
- <output>means write the value of<variable>to the output file(we aren't interesting about the real output file.)
- <condition>means if and only if the value of the <variable> equals to <integer>, <goto> will be executed, otherwise the next sentence executed is as usual.
- After<goto>, the next sentence executed is the sentence with level which equals to the level in<goto>.
- Program terminates by itself when <end> is executed.
- This program can deal with all the signed 32-bit integers.
- The number of sentences in the program is not more than 100.
- The length of each line in the input file is not more than 20.
- The input is correct.
- The sentence with the maximum level is always <end>.
- The levels is not more than 3000.
Input terminate by EOF.
Output
Output the number of sentences executed.If the program can not terminate by itself,output -1.
Example
Input: 10 A+1 20 IF A=5 GO 60 60 END 30 A+2 40 A? 50 GO 20 Output: 11 Hint: 10->20->30->40->50->20->30->40->50->20->60
| Added by: | Fudan University Problem Setters |
| Date: | 2008-01-02 |
| Time limit: | 30s |
| Source limit: | 50000B |
| Memory limit: | 1536MB |
| Cluster: | Cube (Intel G860) |
| Languages: | All except: C99 ERL GOSU JS-RHINO |
| Resource: | a copy of ANALYSER problem with 30s time limit and 1 large test case |
hide comments
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2012-12-09 13:24:49 Omar Soto
How far is possible to optimize the execution of a program that accomplish this using JAVA? |
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