求助，自测没问题，80分

Henry_Yves @ 2024-12-28 21:32:18

#include <iostream>
#include <cmath>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <cstdlib>
#include <string>
#define un unsigned
typedef long long ll;
double my(double a, double b, double c, double d)
{
    return pow((pow(abs(a - c), 2) + pow(abs(b - d), 2)), 0.5);
}
using namespace std;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    double a[6];
    for (int i = 0; i < 6; i++)
        cin >> a[i];
    double sum = 0;
    sum += my(a[0], a[1], a[2], a[3]);
    sum += my(a[0], a[1], a[4], a[5]);
    sum += my(a[4], a[5], a[2], a[3]);
    cout << fixed << setprecision(2) << sum;
    return 0;
}

by SuperBeetle @ 2024-12-28 21:39:15

@Henry_Yves改成

#include <iostream>
#include <cmath>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <cstdlib>
#include <string>
#define un unsigned
typedef long long ll;
double my(double a, double b, double c, double d)
{
    return sqrt((a - c) * (a - c) + (b - d) * (b - d));
}
using namespace std;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    double a[6];
    for (int i = 0; i < 6; i++)
        cin >> a[i];
    double sum = 0;
    sum += my(a[0], a[1], a[2], a[3]);
    sum += my(a[0], a[1], a[4], a[5]);
    sum += my(a[4], a[5], a[2], a[3]);
    cout << fixed << setprecision(2) << sum;
    return 0;
}