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https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
20 lines
414 B
C++
20 lines
414 B
C++
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#include <iostream>
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#include <cstdio>
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#include <cstring>
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#include <cmath>
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using namespace std ;
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double dp[1000005] ;
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int main()
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{
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dp[1]=1.0 ;
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for(int i=2 ;i<=1000000 ;i++)
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dp[i]=dp[i-1]+1.0/i ;
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int n ;
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while(~scanf("%d",&n))
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{
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if(n>1000000)printf("%.4f\n",0.57721566490153286060651209+log(n+1)) ;
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else printf("%.4f\n",dp[n]) ;
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}
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return 0 ;
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}
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