1 #include "bits\stdc++.h"
2 using namespace std;
3 int n, T;
4 double c;
5 int ans[200010];
6
7 int m, p;
8
9 int main()
10 {
11 scanf("%d%d%lf", &n, &T, &c);
12 int i;
13 for(i = 1; i <= n; ++i) {
14 scanf("%d", &ans[i]);
15 }
16 scanf("%d", &m);
17 i = 1;
18 __int64 sum = 0;
19 double mean = 0;
20 int j;
21 for(j = 1; j <= m; ++j) {
22 scanf("%d", &p);
23 for( ; i <= p; ++i) {
24 sum += ans[i];
25 if(i > T)
26 sum -= ans[i - T];
27 mean = (mean + (double)ans[i] / T) / c;
28 }
29 double real = (double)sum / T;
30 printf("%f %f %f\n", real, mean, (double)fabs(mean - real) / real);
31 }
32 }
