How to transform the circular domain problem into the interval intersection problem

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The problem of circle domain is transformed into the problem of intersection of intervals.

(Use the right endpoint as a criterion-it is easier to cover the next paragraph)

#include#include#include#include#includeusing namespace std;const int N=1010;int n,d;struct Segment{ double l,r; //overloaded operator bool operator

n>>d; for(int i=0;id) failed=true; else{ //interval length double len=sqrt(d*d-y*y); seg[i].l=x-len; seg[i].r=x+len; } } if(failed) puts("-1"); else{ //interval right endpoint sort sort(seg,seg+n); int res=0; double last=-1e20; for(int i=0;i