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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. struct Point {
  5.     double x, y;
  6. };
  7. Point a[100005];
  8. int n;
  9. void init() {
  10.     cin >> n;
  11.  
  12. }
  13.  
  14. void solve() {
  15.     for (int i = 0; i < n; i++) {
  16.         cin >> a[i].x >> a[i].y;
  17.     }
  18.  
  19.     double chuVi = 0;
  20.     for (int i = 0; i < n; i++) {
  21.         int j = (i + 1) % n;
  22.         double dx = a[i].x - a[j].x;
  23.         double dy = a[i].y - a[j].y;
  24.         chuVi += sqrt(dx * dx + dy * dy);
  25.     }
  26.  
  27.     cout << fixed << setprecision(6) << chuVi;
  28. }
  29.  
  30. int main() {
  31.     init();
  32.     solve();
  33.     return 0;
  34. }
  35.  
Success #stdin #stdout 0.01s 5288KB
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4
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1 0
0 1
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stdout
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4.828427
https://ideone.com/nt8lUP
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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