UESTC: failed to separate some sample input/output when only one case is provided
UESTC: failed to separate some sample input/output when only one case is
provided

There are two occasions for simple sample input and output:
1. sampleInput/sampleOutput is a string
2. sampleInput/sampleOutput is one-element array

Previously only the first occasion is considered.

BNUACM/bnuoj-web-v3,crccw/bnuoj-web-v3,crccw/bnuoj-web-v3,semprathlon/jnuoj-web,BNUACM/bnuoj-web-v3,crccw/bnuoj-web-v3,semprathlon/jnuoj-web,semprathlon/jnuoj-web,crccw/bnuoj-web-v3,semprathlon/jnuoj-web,BNUACM/bnuoj-web-v3,BNUACM/bnuoj-web-v3