You Are All Excellent（余弦排比0~180）

#include<stdio.h>#include<math.h>#include<algorithm>using namespace std;struct loaction{ double x; double y;}s[101];int cmp(loaction a,loaction b){ double c,d; c=a.x/sqrt(a.x*a.x+a.y*a.y); d=b.x/sqrt(b.x*b.x+b.y*b.y); return acos(c)<acos(d);}int main (){ int m,i; while(scanf("%d",&m)!=EOF&&m>=0) {  for(i=0;i<101;i++)  {   s[i].x=0;s[i].y=0;  }  for(i=0;i<m;i++)  {   scanf("%lf%lf",&s[i].x,&s[i].y);  }  sort(s,s+m,cmp);  for(i=0;i<m-1;i++)  {   printf("%.1lf %.1lf ",s[i].x,s[i].y);  }  printf("%.1lf %.1lf\n",s[m-1].x,s[m-1].y); } return 0;}

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