43 lines
542 B
C++
43 lines
542 B
C++
#include<iostream>
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#include<cstdio>
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using namespace std;
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const int N=1e6+5;
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const int size=100;
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double hn[N];
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void gethn(){
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int i,j,k;
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double temp;
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hn[0]=0;
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temp=0;
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k=1;
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for(i=1;i<=N;i++){
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for(j=1;j<=size;j++){
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temp+=(1.0)/k;
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k++;
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}
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hn[i]=temp;
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}
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}
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double readhn(int x){
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double ans;
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int c=x%size;
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ans=hn[x/size];
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for(int i=x-c+1;i<=x;i++) ans+=1.0/i;
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return ans;
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}
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int main(){
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gethn();
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int i,t,n;
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scanf("%d",&t);
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for(i=1;i<=t;i++){
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scanf("%d",&n);
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printf("Case %d: %.10lf\n",i,readhn(n));
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}
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return 0;
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}
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