Getline Two - C++

#include <bits/stdc++.h>
using namespace std;

#define f(i, s, f) for(int i = s; i < f; ++i)
#define r(x, ns) for(auto& x : ns)

int main() {
  int n; cin>>n;
  string p;
  double kg, rs, kgs = 0, rss = 0;
  f(i,0,n) {
    cin>>rs;
    getline(cin, p);
    getline(cin, p);
    kg = 1;
    r(l, p) kg += (l == ' ');
    printf("day %d: %.0lf kg\n", i+1, kg);
    rss += rs, kgs += kg;
  }
  printf("%.2lf kg by day\nR$ %.2lf by day\n", kgs / n, rss / n);
}