s[i]+=(1.0/pow(r,i+1));在线求答案,
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s[i]+=(1.0/pow(r,i+1));在线求答案,
s[i]+=(1.0/pow(r,i+1));在线求答案,
s[i]+=(1.0/pow(r,i+1));在线求答案,
s[i]=s[i]+1/pow(r,i+1)
pow(r,i+1)表示r的i+1次方