POJ 1862 Stripies

 1 #include <stdio.h>
 2 #include <math.h>
 3 #include <string.h>
 4 #include <algorithm>
 5 #include <iostream>
 6 #include <string>
 7 #include <time.h>
 8 #include <queue>
 9 #include <string.h>
10 #define sf scanf
11 #define pf printf
12 #define lf double
13 #define ll long long
14 #define p123 printf("123\n");
15 #define pn printf("\n");
16 #define pk printf(" ");
17 #define p(n) printf("%d",n);
18 #define pln(n) printf("%d\n",n);
19 #define s(n) scanf("%d",&n);
20 #define ss(n) scanf("%s",n);
21 #define ps(n) printf("%s",n);
22 #define sld(n) scanf("%lld",&n);
23 #define pld(n) printf("%lld",n);
24 #define slf(n) scanf("%lf",&n);
25 #define plf(n) printf("%lf",n);
26 #define sc(n) scanf("%c",&n);
27 #define pc(n) printf("%c",n);
28 #define gc getchar();
29 #define re(n,a) memset(n,a,sizeof(n));
30 #define len(a) strlen(a)
31 #define LL long long
32 #define eps 1e-6
33 using namespace std;
34 double a[100500];
35 bool cmp(double a, double b){
36     return a > b;
37 }
38 int main() {
39     int n = 0;
40     s(n);
41     for(int i = 0; i < n; i ++){
42         slf(a[i]);
43     }
44     sort(a,a+n,cmp);
45     double temp = a[0];
46     for(int i = 1; i< n ;i ++){
47         temp = 2.0*sqrt(a[i]*temp);
48     }
49     pf("%.3lf\n",temp);
50     return 0;
51 }