#include<stdio.h> #include<math.h> main() { int a,b,c,d,k,t,n,i; double x,y,sum; scanf("%d",&n); a=2; b=3; c=1; d=a; k=t=0; x=5; y=3; if(n==1){ x=2; y=1; } for(i=3;i<=n;i++){ k=a+b; x=x+k; t=b; y=y+t; a=t; b=k; c=d; d=t; } sum=x/y; printf("%.6f",sum); } |
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