Improve sample input/output display
Improve sample input/output display

i think <p will be better than <p>, and it solve the little LightOJ problem where linebreaks in table are maintained due to the <pre> wrapper

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