Submission #2671222

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define inf 1e9
#define ll long long
#define ull unsigned long long
#define M 1000000007
#define P pair<int,int>
#define PLL pair<ll,ll>
#define FOR(i,m,n) for(int i=m;i<n;i++)
#define RFOR(i,m,n) for(int i=m;i>=n;i--)
#define rep(i,n) FOR(i,0,n)
#define rrep(i,n) RFOR(i,n,0)
#define all(a) a.begin(),a.end()
const int vx[4] = {0,1,0,-1};
const int vy[4] = {1,0,-1,0};
#define PI 3.14159265


int main(){
  double x1, y1, x2, y2, x3, y3;
  cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
  double d1 = hypot(x1 - x2, y1 - y2);
  double d2 = hypot(x2 - x3, y2 - y3);
  double d3 = hypot(x3 - x1, y3 - y1);
  double s = (d1 + d2 + d3) * 0.5;
  s = sqrt(s * (s - d1) * (s - d2) * (s - d3));
  double r = 2 * s / (d1 + d2 + d3);
  double p = max(d1, max(d2, d3));
  cout << fixed << setprecision(10) << r * p / (p + 2 * r) << endl;

  return 0;
}

Submission Info

Judge Result