题解 | 牛牛学数列3
牛牛学数列3
https://www.nowcoder.com/practice/f65c726d081c4160a9356eabf0dc21d9
#include <stdio.h>
int main()
{
int n=0;
scanf("%d",&n);
float sum=0,sum1=0;
int k=-1,m=0;
for(int i=1;i<=n;i++)
{
k+=2;
if(i%2==0)
{
m=-k;
}
else
{
m=k;
}
sum1+=m;
sum+=1.0/sum1;
}
printf("%.3f",sum);
return 0;
}
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