A29739.三角形的周长题解

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不按套路出牌的我：

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

int main() {
    double x1, y1, x2, y2, x3, y3;
    cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
    double d1 = sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));
    double d2 = sqrt(pow(x3 - x2, 2) + pow(y3 - y2, 2));
    double d3 = sqrt(pow(x1 - x3, 2) + pow(y1 - y3, 2));    
    double perimeter = d1 + d2 + d3;
    cout << fixed << setprecision(2) << perimeter << endl;
    return 0;
}