47 lines
865 B
C++
47 lines
865 B
C++
#include<cstdio>
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#include<cmath>
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#include<algorithm>
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using namespace std;
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const int maxn=1005;
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const double eps=1e-5;
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struct OBJ { int x,y,w; };
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int n,dx,dy; OBJ a[maxn];
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double x,y,step=20000,tx,ty;
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void move()
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{
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double mx=0,my=0,len;
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for(int i=1;i<=n;i++)
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{
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len=sqrt((x-a[i].x)*(x-a[i].x)+(y-a[i].y)*(y-a[i].y));
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if(fabs(len)<eps) continue;
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mx+=a[i].w*(a[i].x-x)/len;
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my+=a[i].w*(a[i].y-y)/len;
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}
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len=sqrt(mx*mx+my*my);
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x+=step*mx/len;
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y+=step*my/len;
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}
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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",&n);
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for(int i=1;i<=n;i++) scanf("%d%d%d",&a[i].x,&a[i].y,&a[i].w);
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while(step>=eps)
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{
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tx=x,ty=y;
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move();
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if(fabs(tx-x)<eps&&fabs(ty-y)<eps) break;
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if(dx!=(x>tx)||dy!=(y>ty))
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{
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dx=x>tx;
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dy=y>ty;
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step=step*0.5;
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}
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// printf(">>> %.3lf %.3lf\n",x,y);
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}
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printf("%.3lf %.3lf\n",x,y);
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return 0;
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}
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