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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main() {
  4.     ios::sync_with_stdio(false);
  5.     cin.tie(nullptr);
  6.  
  7.     long long n, l, v1, v2, k;
  8.     cin >> n >> l >> v1 >> v2 >> k;
  9.  
  10.     double low = 0, high = double(l) / v1;
  11.     int trips = (n + k - 1) / k;
  12.  
  13.     for (int it = 0; it < 100; ++it) {
  14.         double mid = 0.5*(low + high);
  15.         // Tính D theo công thức
  16.         double D = (v1 * v2 * (mid - double(l)/v1)) / (v1 - v2);
  17.         if (D <= 0) {
  18.             // Đi bộ cũng kịp
  19.             high = mid;
  20.             continue;
  21.         }
  22.         if (D > l) {
  23.             // Cần đi buýt dài hơn quãng đường => không khả thi
  24.             low = mid;
  25.             continue;
  26.         }
  27.         // Thời gian buýt chạy tất cả các chuyến
  28.         double tbus = (2.0 * trips - 1.0) * (D / v2);
  29.         if (tbus <= mid) high = mid;
  30.         else low = mid;
  31.     }
  32.  
  33.     cout << fixed << setprecision(9) << high << "\n";
  34.     return 0;
  35. }
  36.  
Success #stdin #stdout 0s 5308KB
comments (?)
stdin 
3 6 1 2 1
stdout 
5.000000000
https://ideone.com/i9JDIk
language:
C++14 (gcc 8.3)
created:
19 hours ago
visibility:
public

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