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Oct 21st, 2019
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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4. #include <cmath>
  5. using namespace std;
  6.  
  7. typedef long long int ll;
  8. int t, d, n;
  9. vector<int> a, b, p;
  10.  
  11. bool f(double v) {
  12. int time = 0, len = 0;
  13. for(int i = 0; i < p.size(); i++) {
  14. time += (p[i] - len) / v + 1;
  15. len += p[i];
  16. if(time % (a[i] + b[i]) <= a[i]) {
  17. time += (time % (a[i] + b[i])) - 1;
  18. }
  19. }
  20. time += (d - len) / v + 1;
  21. if(time <= t)
  22. return true;
  23. else return false;
  24. }
  25.  
  26.  
  27. int main() {
  28. //freopen("che.in", "r", stdin);
  29. //freopen("che.out", "w", stdout);
  30. cin >> t >> d >> n;
  31. a.resize(n);
  32. b.resize(n);
  33. p.resize(n);
  34. for(int i = 0; i < n; i++) {
  35. cin >> a[i] >> b[i] >> p[i];
  36. }
  37. double l = 1.0, r = 4;
  38. for(int i = 0; i < 1000; i++) {
  39. double m = (r - l) / 2;
  40. if(f(m)) {
  41. r = m;
  42. }
  43. else l = m;
  44. }
  45. cout << l;
  46. return 0;
  47. }
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