22 lines
322 B
C++
22 lines
322 B
C++
#include<cstdio>
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#include<cmath>
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int T;
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double a,b,s,ans,m;
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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scanf("%d", &T);
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while(T--)
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{
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scanf("%lf%lf%lf",&a,&b,&s);
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m=a*b;
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if(fabs(s)<1e-6) ans=1;
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else if(s>m) ans=0;
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else ans=(m-s-s*log(m/s))/m;
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printf("%.6lf%%\n",ans*100);
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}
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return 0;
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}
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