数学计算

#include <iostream>

using namespace std;
int n;

int main(void) {
  scanf("%d", &n);
  int a[n];
  for (int i = 0; i < n; ++i)
    scanf("%d", &a[i]);

  for (int i = 0; i < n; ++i)
    printf("%d ", (i == 0) 
        ? (a[i] + a[i + 1] >> 1) 
        : ((i == n - 1) ? (a[i] + a[i - 1] >> 1) : ((a[i - 1] + a[i] + a[i + 1]) / 3)));

  return 0;
}