foo.cc: In function 'bool cmp(lx, lx)':
foo.cc:12:13: error: 'sqr' was not declared in this scope; did you mean 'sqrt'?
   12 |     return (sqr(a.x)+sqr(a.y))<(sqr(b.x)+sqr(b.y));
      |             ^~~
      |             sqrt
foo.cc: In function 'int main()':
foo.cc:22:14: error: 'sqr' was not declared in this scope; did you mean 'sqrt'?
   22 |     ans=sqrt(sqr((p[n].x-p[1].x))+sqr((p[n].y-p[1].y)));
      |              ^~~
      |              sqrt

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