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11 lines
221 B
C++
11 lines
221 B
C++
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#include<stdio.h>
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int main(){
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double m,j,i;
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while(scanf("%lf",&m)!=EOF&&m!=0){
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j=0;int k=1;
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for(i=m;i>=1;i--)
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j=j+1.00/i*k++;
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printf("%.2f\n",2*j-m);}
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return 0;
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}
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