1909167_ac_15ms_72k.c

北大大牛代码 1240道题的原代码 超级权威

# include <stdio.h>

int main()
{
  int i, n;
  double a0, an1, a1, tmpc, sum, S;
  
  scanf("%d",&n);
  scanf("%lf%lf",&a0,&an1);
  sum = 0;S = 0;
  for(i = 1; i <= n; i++)
   {
     scanf("%lf",&tmpc);
     sum += tmpc;
     S += sum;
   }
   a1 =(an1-2*S+n*a0)/(n+1);
   printf("%.2lf\n",a1);
   return 1;
}