25 lines
436 B
C++
25 lines
436 B
C++
#include <iostream>
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#include <cstdlib>
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#include <cstdio>
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#include <cstring>
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using namespace std;
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int a[20];
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int b[20];
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int main(){
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int test,n;
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scanf("%d",&test);
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while (test--){
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scanf("%d",&n);
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for (int i=0;i<n;i++)
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scanf("%d",&a[i]);
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for (int j=0;j<n;j++)
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scanf("%d",&b[j]);
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int ans=0;
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for (int i=0;i<n;i++)
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for (int j=0;j<n;j++)
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if (b[i]>a[j]) ans+=3;
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printf("%.6lf\n",ans*1.0/n);
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}
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return 0;
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}
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