Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
Alan Gauld wrote: "bob gailer" [EMAIL PROTECTED] wrote i don't really understand that. you are trying to say that the tests from the online judge are not "exactly good" ? Yes that's exactly what I'm saying. At least one test case has a non-decimal character. Which actually makes it a very good test since thats exactly the kind of thing you should be testing for :-) A test suite that only checks valid data is a bad test. That's fine if writing a test suite for production software, but from the problem description: "There is a string containing only decimal digit characters." Testing for valid input seems to be outside the scope of the problem definition. :-) ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
i'm thinking the same way Eric do. On Wed, Feb 27, 2008 at 11:18 PM, Eric Brunson [EMAIL PROTECTED] wrote: Alan Gauld wrote: bob gailer [EMAIL PROTECTED] [EMAIL PROTECTED] wrote i don't really understand that. you are trying to say that the tests from the online judge are not exactly good ? Yes that's exactly what I'm saying. At least one test case has a non-decimal character. Which actually makes it a very good test since thats exactly the kind of thing you should be testing for :-) A test suite that only checks valid data is a bad test. That's fine if writing a test suite for production software, but from the problem description: There is a string containing only decimal digit characters. Testing for valid input seems to be outside the scope of the problem definition. :-) ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
Eric Brunson [EMAIL PROTECTED] wrote Alan Gauld wrote: Which actually makes it a very good test since thats exactly the kind of thing you should be testing for :-) Note the smiley... A test suite that only checks valid data is a bad test. Testing for valid input seems to be outside the scope of the problem definition. :-) As I note yours... However, there is a bit of a serious point here too in that users never ask for data validation (at least mine never do!) they just expect it. So I still maintain that any test suite no matter how basic should always cover some tests for invalid input data. Even well intentioned users will make mistakes and a program that crashes on invalid input is not user friendly - even if the only user is the author! Alan G ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
Alan Gauld wrote: Eric Brunson [EMAIL PROTECTED] wrote Alan Gauld wrote: Glad we both noted the smileys. :-) However, there is a bit of a serious point here too in that users never ask for data validation (at least mine never do!) they just expect it. So I still maintain that any test suite no matter how basic should always cover some tests for invalid input data. Definitely a valid point. I just spent twenty minutes this afternoon tracking down a problem in my own code where, because I was supplying the input from a database, I could count on converting the value to a float. However, that didn't account for not finding a value at all. Even well intentioned users will make mistakes and a program that crashes on invalid input is not user friendly - even if the only user is the author! Bingo. :-) Always a pleasure, e. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
This thread got started due to the DIV15 problem on the Sphere Online Judge. This is almost a black box test environment. Submit a program. If it generates the expected output you get accepted. The other results are compilation error, time limit exceeded, runtime error (followed by (SIGSEGV), (SIGABRT), (other), (NZEC)), or wrong answer. If the program did not exceed the time limit you also get the execution time. (Some problems give problem-specific results but that does not apply to the DIV15 problem) In looking over the status list of submitted programs I noted cases where the results were 100, 102. I wonder what that means and how it was generated So there is a (limited) way to get information out of a program, and that is to use time.sleep() to control the execution time. But that costs one program submission for each thing one might want to test. That's how I determined there was a bad character in the input. So now I imagine creating an automated program submitter, so I could create a large number of test cases and an automated way to read the execution times off the results page. Eventually one might garner enough information. Of course that might get the attention of the site operators and lead to a change in how things are run to discourage automated testing. -- Bob Gailer 919-636-4239 Chapel Hill, NC ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
Andrei Petre wrote: https://www.spoj.pl/problems/DIV15/ I wrote my own version and submitted it. I got NZEC also. The evidence pointed to a character in the test data other than 0123456789. So I contrived a way to test for this and found that to be true. I don't know what the character is or which test case it is in but there is at least one bad character, and it is chr(32) (i.e. a control character). After revising my program to eliminate these bad characters I now get wrong answer. So now I revise my algorithm. -- Bob Gailer 919-636-4239 Chapel Hill, NC ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
I will share my algorithm just for the heck of it and to see if you see any problem. Underlying theory: Divisible by 15 == divisible by 3 and divisible by 5 If a number is divisible by 3 any rearrangement of its digits is also divisible by 3. Therefore to get the largest number, put the digits in descending order. If the number is not divisible by 3 it can be made divisible by 3 by removing one or 2 non-multiple-of-3 digits To be divisible by 5 the rightmost digit must be 0 or 5. If it is neither then a 5 must be moved from the interior to the end. s = the test case input If there are no '0's and no '5's in s then impossible. Convert s (string) to a list, sort it, reverse it. If rightmost digit is not '0' or '5', remove a '5' from the list (we will append it at checkout) On a parallel path: i = int(s) # make numeric r = i % 3 # get modulo if r == 0 # divisible by 3 (regardless of the order of the digits) proceed to checkout else attempt to remove one or two digits to bring the modulo to 0 if possible remove just 1 digit (the lower the better) (the candidates are, for r ==1-1,4,7 r==2-2,5,8) otherwise if possible remove 2 digits (the lower the better) (the candidates are, for r ==2-1,4,7 r==1-2,5,8) otherwise impossible checkout: if we removed a '5' from the list, append it join and print the list -- Bob Gailer 919-636-4239 Chapel Hill, NC ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
Note I cc: [EMAIL PROTECTED] Please do so also so the other tutors can follow the discussion. Andrei Petre wrote: the theory seems just like mine :) your way to implement it looks fine ( although it supports some optimization :)) But: - i don't understand : i = int(s) where s = the test case input (= a LIST ??) s is a string you should summs up the elements of the list In the pursuit of performance I chose int(s) as being potentially a lot faster than looping over all the chars, applying int() to each and summing. - it's not very clear in your implementation what happens with the case : 815. try it I get 15. However 875 gives a wrong answer! Turns out that if the rightmost digit is not 0 I must remove a 5 even if that is the rightmost digit! Even after fixing that I still get wrong answer! and in one of your posts, you said: The evidence pointed to a character in the test data other than 0123456789. So I contrived a way to test for this and found that to be true. I don't know what the character is or which test case it is in but there is at least one bad character, and it is chr(32) (i.e. a control character). i don't understand , in your i don't really understand that. you are trying to say that the tests from the online judge are not exactly good ? Yes that's exactly what I'm saying. At least one test case has a non-decimal character. -- Bob Gailer 919-636-4239 Chapel Hill, NC ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
bob gailer [EMAIL PROTECTED] wrote i don't really understand that. you are trying to say that the tests from the online judge are not exactly good ? Yes that's exactly what I'm saying. At least one test case has a non-decimal character. Which actually makes it a very good test since thats exactly the kind of thing you should be testing for :-) A test suite that only checks valid data is a bad test. Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
Hello, I wrote a code for a problem and submitted to an online judge, a program that runs my program against a set of predefined input data. I wrote it for exercise my python writing. In don't want to discuss the algorithm here! I dare to ask for help because the answer was : crashed with Runtime Error: NZEC (non-zero exit code). I heard that is a general error for most interpreters and elsewhere that NZEC error code has to do with exceptions. So, i'm seeking for a possible problem with the coding, not with the algorithm. Here, the code. (l also attached it in a file) Using characters of the string, the program should construct the maximum number which divides by fifteen without remainder. example *Input:* 1 02041 *Output:* 4200 [code] import sys def write(number): # assamble the number # assure the 5 divisibility if number[0] != 0: number[0] -= 1 last_d = 0 else: number[5] -= 1 last_d = 5 zero = True for i in reversed(range(1,10)): for j in range(digits[i]): sys.stdout.write(i) zero = False # leading zeroes should be omitted if zero == False: for i in range(digits[0]): sys.stdout.write(0) print last_d def remove_item(d,item): if type(item) != list: d[item] -= 1 else: d[item[0]] -= 1 d[item[1]] -= 1 def case5(d,item): # return True if i try to remove the only five that assure the divisibility with 5 return item == 5 and d[0] == 0 and d[item] == 1 def exist(d,item): found = False if type(item) != list: if d[item] != 0 and case5(d,item) == False: found = True else: p1 = d[item[0]] != 0 and case5(d,d[item[0]]) == False d[item[0]] -= 1 p2 = d[item[1]] != 0 and case5(d,d[item[1]]) == False d[item[0]] += 1 if p1 == True and p2 == True: found = True return found def remove(d, mult): found = False for item in mult: if exist(d,item) == True: remove_item(d,item) found = True break if found == False: d = [] return d def remove_all(digits,rest): # if the number is the form 3k+1, i try to remove one 3k+1 digit or two 3k+2 digits # if the number is the form 3k+2, i try to remove one 3k+2 digit or two 3k+2 digits one = [1,4,7,[2,2],[2,5],[2,8],[5,5],[5,8],[8,8]] two = [2,5,8,[1,1],[1,4],[1,7],[4,4],[4,7],[7,7]] if rest == 1: d = remove(digits, one) else: d = remove(digits, two) return d def resolve(digits): suma = 0 for i in range(10): suma += i*digits[i] rest = suma % 3 if rest != 0: # if it's not divisible with 3 i try to remove some digits digits = remove_all(digits,rest) return digits t = int(raw_input()) for tt in range(t): line = raw_input() digits = [0]*10 # counts the frequence of digits in the string for i in range(len(line)): digits[int(line[i])] += 1 # if it's not divisible with 5 if digits[0] == 0 and digits[5] == 0: print(impossible) else: number = resolve(digits) if(number == []): print(impossible) else: write(number) [/code] Any alternatives for the personal rambling(if it's a wrong way to do it, of course): L = [1,2,[3,4],[5,5]] for item in L: if type(item) == list: print L[item[0]], L[item[1]] else: print L[item] Thanks, Andrei import sys def write(number): # assamble the number # assure the 5 divisibility if number[0] != 0: number[0] -= 1 last_d = 0 else: number[5] -= 1 last_d = 5 zero = True for i in reversed(range(1,10)): for j in range(digits[i]): sys.stdout.write(i) zero = False # leading zeroes should be omitted if zero == False: for i in range(digits[0]): sys.stdout.write(0) print last_d def remove_item(d,item): if type(item) != list: d[item] -= 1 else: d[item[0]] -= 1 d[item[1]] -= 1 def case5(d,item): # return True if i try to remove the only five that assure the divisibility with 5 return item == 5 and d[0] == 0 and d[item] == 1 def exist(d,item): found = False if type(item) != list: if d[item] != 0 and case5(d,item) == False: found = True else: p1 = d[item[0]] != 0 and case5(d,d[item[0]]) == False d[item[0]] -= 1 p2 = d[item[1]] != 0 and case5(d,d[item[1]]) == False d[item[0]] += 1 if p1 == True and p2 == True: found = True return found def remove(d, mult): found = False for item in mult: if exist(d,item) == True: remove_item(d,item) found = True break if found == False: d = [] return d
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
Andrei Petre wrote: Hello, I wrote a code for a problem and submitted to an online judge, a program that runs my program against a set of predefined input data. Did you run the code yourself? It would appear that you did not. Before submitting to an online judge run the code on your own computer. Can you do that? Do you know how? When you run it you will discover an error. Fix that and try again. [snip] -- Bob Gailer 919-636-4239 Chapel Hill, NC ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code) WAIT!!!
Hold the phone! Ignore previous email. Working... -- Bob Gailer 919-636-4239 Chapel Hill, NC ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] crashed with Runtime Error: NZEC (non-zero exit code)
OK I maintain what I wrote earlier: Did you run the code yourself? It would appear that you did not. Before submitting to an online judge run the code on your own computer. Can you do that? Do you know how? When you run it you will discover an error. Fix that and try again. [snip] -- Bob Gailer 919-636-4239 Chapel Hill, NC ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
