Submission #11381963

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Source Code Expand

#include <bits/stdc++.h>
#include <string>
#define ft first
#define sc second
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) (a)=max(a, b);
#define chmin(a, b) (a)=min(a, b);
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
static const ll INF=1e18;
static const ll MAX=101010;
static const ll MOD=1e9+7;


/*
 for(i=0; i<N; i++)
   cin >> a[i];
*/



int main(void) {
  ll i, j, k;
  
  double x[3], y[3];
  for(i=0; i<3; i++) cin >> x[i] >> y[i];
  
  double d[3];
  for(i=0; i<3; i++) {
    double tx=abs(x[i]-x[(i+1)%3]);
    double ty=abs(y[i]-y[(i+1)%3]);
    d[i]=sqrt(tx*tx+ty*ty);
  }
  
  double tanhfA[i];
  for(i=0; i<3; i++) {
    double a=d[i];
    double b=d[(i+1)%3];
    double c=d[(i+2)%3];
    double cosA=(b*b+c*c-a*a)/(2*b*c);
    tanhfA[i]=sqrt((1-cosA)/(1+cosA));
  }
  
  double ans=0;
  for(i=0; i<3; i++)
    chmax(ans, d[i]/(1/tanhfA[(i+1)%3]+2+1/tanhfA[(i+2)%3]));
  printf("%.12f\n", ans);
  
}

Submission Info

Judge Result