Why does my Python program issue a runtime error- NZEC( Non-zero exit code)?

问题

This is a CodeChef problem for the November challenge. I donot intend to cheat. My program works well for the test input provided. But the server generates a runtime NZEC error. Can you help me identify my mistake?

T= raw_input()
for i in xrange(int(T)):
    G= raw_input()
    for j in xrange(int(G)):
        I, N, Q = raw_input().split()
        I= int(I)
        N= int(N)
        Q= int(Q)
        a= [I]*N
        print a
        count=0
        for k in xrange(N):
            if((N-k) % 2 != 0):
                if a[k]==1:
                    a[k]=2
                else: a[k]=1
        print a
        for k in xrange(N):
            if( a[k] == Q):
                count= count+1
        print count

Thank you very much.

回答1:

The problem description says that N can be 10**9. So a= [I]*N might require several gigabytes of memory. Your program probably terminates with MemoryError exception that leads to non-zero exit status (1).

来源：https://stackoverflow.com/questions/13216600/why-does-my-python-program-issue-a-runtime-error-nzec-non-zero-exit-code