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 }