36 lines
828 B
C++
36 lines
828 B
C++
#include <iostream>
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#include <cstdio>
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#include <cstring>
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#include <algorithm>
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using namespace std;
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double PI = 3.1415926 * 2;
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int t,n;
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double r;
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double dis_tance;
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double minn;
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int map[100010];
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int main()
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{
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scanf("%d",&t);
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while(t --)
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{
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minn = 100000.00;
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scanf("%d%lf",&n,&r);
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memset(map,0,sizeof(map));
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for(int i = 1;i <= n;i ++)
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scanf("%d",&map[i]);
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if(map[1] == map[n])
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printf("inf\n");
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else
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{
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sort(map + 1,map + n + 1);
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dis_tance = (PI * r) / n;
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for(int i = n;i > 1;i --)
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if(dis_tance / (map[i] - map[i - 1]) < minn)
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minn = dis_tance / (map[i] - map[i - 1]);
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printf("%.3lf\n",minn);
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}
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}
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return 0;
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}
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