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P5143 攀爬者

R38821808
This commit is contained in:
Baoshuo Ren 2020-09-24 19:36:41 +08:00 committed by Baoshuo Ren
parent 7eab5ffb7f
commit aa89a19d58
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68

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problem/P5143/P5143.cpp Normal file
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// R38821808
#include <bits/stdc++.h>
using namespace std;
struct node {
int x, y, z;
node() {
x = y = z = 0;
}
};
double ed(node a, node b) {
return sqrt(pow(a.x - b.x, 2) + pow(a.y - b.y, 2) + pow(a.z - b.z, 2));
}
bool cmp(node a, node b) {
return a.z <= b.z;
}
int main() {
int n;
node a[50005];
double ans = 0.000;
scanf("%d", &n);
for(int i = 0 ; i < n ; i++) {
scanf("%d%d%d", &a[i].x, &a[i].y, &a[i].z);
}
sort(a, a+n, cmp);
for(int i = 1 ; i < n ;i++) {
ans += ed(a[i-1], a[i]);
}
printf("%.3lf", ans);
return 0;
}