18 lines
270 B
C++
18 lines
270 B
C++
#include<cstdio>
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#include<cmath>
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using namespace std;
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int main()
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{
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double a,b,c;
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scanf("%lf%lf%lf",&a,&b,&c);
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if(!(a+b>c&&a+c>b&&b+c>a)) printf("no\n");
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else
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{
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double p=(a+b+c)/2.0;
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double ans=sqrt(p*(p-a)*(p-b)*(p-c));
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printf("%lf\n",ans);
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}
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return 0;
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}
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