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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef pair<double, double> data;
  5. vector<data> input;
  6. double s;
  7. int n;
  8.  
  9. double getTime(double x, double y){
  10.     double t = (x - input[0].first)/input[0].second * 1.0;
  11.     t = 0;
  12.     for(int i = 0; i < n; ++i){
  13.         if(input[i].first < x){
  14.             t = max(t, (x - input[i].first)/input[i].second * 1.0);
  15.         }else if(input[i].first > y){
  16.             t = max(t, (input[i].first - y)/input[i].second * 1.0);
  17.         }
  18.     }
  19.  
  20.     return t;
  21. }
  22.  
  23. bool cmp(data d1, data d2){
  24.     return d1.second < d2.second;
  25. }
  26.  
  27. int main(){
  28.     cin >> n;
  29.     double t2, t1, s, t = 0;
  30.     double l, r, m, temp;
  31.     cin >> temp;
  32.     input.push_back(make_pair(temp,0));
  33.     l = temp;
  34.     r = temp;
  35.     for(int i = 1; i < n; ++i){
  36.         cin >> temp;
  37.         l = min(temp, l);
  38.         r = max(temp, r);
  39.         input.push_back(make_pair(temp,0));
  40.     }
  41.  
  42.     for(int i = 0; i < n; ++i){
  43.         cin >> input[i].second;
  44.     }
  45.  
  46.     while(l != r ){
  47.         m = (l + r)/2;
  48.         if(l == m) break;
  49.         t1 = getTime(m, r);
  50.         t2 = getTime(l, m);
  51.         t = min(t1, t2);
  52.         //cout << t1 << " " << t2 << endl;
  53.         if(max(t1, t2) - min(t1, t2) < 0.00000009) break;
  54.         if(t1 > t2) r = m;
  55.         else l = m;
  56.     }
  57.     //cout << l << " " << r;
  58.     printf("%.9f", t);
  59.     //for(int i = 0; i < input.size(); ++i) cout << input[i].first << " " << input[i].second << endl;
  60.  
  61.  
  62. }
  63.  
Success #stdin #stdout 0s 16064KB
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stdin
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Standard input is empty
stdout
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0.000000000
https://ideone.com/Vptrol
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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