18 lines
395 B
C++
18 lines
395 B
C++
#include <cstdio>
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#include <cmath>
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using namespace std;
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#define F(x) abs(x)>1e-6
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int main(){
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double x,y,a,b,s,f;
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while(scanf("%lf%lf",&x,&y)&&(F(x+1.0)||F(y+1.0))){
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s=f=0;
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while(scanf("%lf%lf",&a,&b)&&(F(a)||F(b))){
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if(b<y){
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s+=a-x;f+=y-b;
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}
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x=a;y=b;
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}
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printf("%.0lf\n",s/f*y);
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}
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}
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