35 lines
580 B
C++
35 lines
580 B
C++
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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 a[2500050];
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void init()
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{
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double sum=0.0;
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for(int i=1; i<100000001; i++)
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{
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sum+=1.0/i;
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if(i%50==0) a[i/50]=sum; //ÿ<><C3BF>49<34><39><EFBFBD><EFBFBD>¼һ<C2BC>Ρ<EFBFBD>
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}
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}
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int main()
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{
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init();
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int t,flag=1;
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scanf("%d",&t);
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while(t--)
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{
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int n;
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scanf("%d",&n);
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int f=n/50;
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double ans=a[f];
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for(int i=50*f+1; i<=n; i++) //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѭ<EFBFBD><D1AD><EFBFBD><EFBFBD>50<35><30><EFBFBD><EFBFBD>
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ans+=1.0/i;
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printf("Case %d: %.10lf\n",flag++,ans);
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}
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return 0;
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}
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