FAQ

Why does sandbox refuse to make?

In local/onlinejudge/judge/sandbox/sand, run the following commands and post output to issues.

uname -a
cc -v
make clean
make

Why pending forever?

1. Check whether the judge daemon (judged) is running. The process's name should be php or php.exe. If not, follow README to launch it.
2. If the daemon quit by itself, check your PHP log (default to syslog or Windows NT events log) for detail error messages.

Why so many internal errors from ideone.com?

Ideone.com will reject the later access if the delay between accesses is too short. You can increase the delay value at settings->site administration->plugins->local plugins->onlinejudge

Where is the restricted functions list?

To protect the online judge server, functions/system calls those may be harmful are not allowed to be used in submissions. Only the following functions are allowed:

1. Read and write an opened file. Eg. read(), write(), fread(), fwrite(), scanf(), printf(), fscanf(), fprintf(), getchar(), putchar() and etc.
2. Allocate/Release memory. Eg. new, delete, malloc(), free(), brk() and etc.