[R] need help with understanding coxph encoding

[summer]

Hi, in coxph,
coxph(Surv(time, status)~x,data=alm). 
How to encode x? For example, if x has two groups, the treatment group and
control group. if I encode them as  1 and 2. Is the HR results
treatment/control? What if I encode them as 0 and 1. I am confused with how
survival package works for HR. What should I do to get a treatment/control
HR?
Thank you.

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