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25 lines
547 B
25 lines
547 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 50010;
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struct Point {
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int x, y, z;
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} a[N];
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bool cmp(const Point &a, const Point &b) {
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return a.z > b.z;
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}
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int main() {
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int n;
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cin >> n;
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for (int i = 1; i <= n; i++)
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cin >> a[i].x >> a[i].y >> a[i].z;
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sort(a + 1, a + 1 + n, cmp);
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double s = 0;
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for (int i = 2; i <= n; i++)
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s += sqrt(pow(a[i].x - a[i - 1].x, 2) + pow(a[i].y - a[i - 1].y, 2) + pow(a[i].z - a[i - 1].z, 2));
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printf("%.3lf", s);
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return 0;
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} |