Submission #2380952

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Source Code Expand

#define _USE_MATH_DEFINES
#pragma region include
#include <iostream>
#include <iomanip>
#include <stdio.h>

#include <sstream>
#include <algorithm>
#include <iterator>
#include <cmath>
#include <complex>

#include <string>
#include <cstring>
#include <vector>
#include <bitset>

#include <queue>
#include <set>
#include <map>
#include <stack>
#include <list>

#include <ctime>
////
//#include <random>//
#pragma endregion //#include
/////////

#pragma region typedef
typedef long long LL;
typedef long double LD;
typedef unsigned long long ULL;
#pragma endregion //typedef
////定数
const int INF = (int)1e9;
const LL MOD = (LL)1e9+7;
const LL LINF = (LL)4e18+20;
const LD PI = acos(-1.0);
const double EPS = 1e-9;
/////////
using namespace::std;

void solve(){
	vector<LD> X(3),Y(3);
	for(int i=0;i<3;++i){
		cin>>X[i]>>Y[i];
	}
	vector<LD> hen(3);
	for(int i=0;i<3;++i){
		int a = i;
		int b = (i+1)%3;
		hen[i] = (X[a]-X[b])*(X[a]-X[b])+(Y[a]-Y[b])*(Y[a]-Y[b]);
		hen[i] = sqrt(hen[i]);
	}
	LD s=0;
	LD S=0;
	LD sum = (hen[0]+hen[1]+hen[2]);
	s= sum /2;
	S=s*(s-hen[0])*(s-hen[1])*(s-hen[2]);
	S = sqrt(S);

	LD r = S*2/(sum);
	LD MAX = max(max(hen[0],hen[1]),hen[2]);
	LD x = r*MAX/(MAX+r*2);
	cout << x << endl;
}

#pragma region main
signed main(void){
	std::cin.tie(0);
	std::ios::sync_with_stdio(false);
	std::cout << std::fixed;//小数を10進数表示
	cout << setprecision(16);//小数点以下の桁数を指定//coutとcerrで別	

	solve();
}
#pragma endregion //main()

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