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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <algorithm>
  4. using namespace std;
  5.  
  6. typedef pair<long double,int> pdc; 
  7.  
  8. pdc FTime[2000100];
  9. int PointR = 0;
  10.  
  11.  
  12. int main(){
  13.         int n,w,u,v;
  14.         long double t1,t2;
  15.         cin >> n >> w >> u >> v >> t1 >> t2;
  16.  
  17.         int nn;
  18.         char z;
  19.         int pos,len;
  20.         int uu;
  21.         long double p1 = (w+0.0)/v;
  22.         for (int i=0;i<n;i++){
  23.                 cin >> z >> nn;
  24.                 if (z == 'E')
  25.                         uu = - u;
  26.                 else uu = u;
  27.                 for (int j=0;j<nn;j++){
  28.                         cin >> len >> pos;
  29.  
  30.                         FTime[PointR++] = pdc( (pos+0.0)/uu - p1*i - p1,1);
  31.                         if (z == 'E') pos-=len;
  32.                                 else pos+=len;
  33.  
  34.                         FTime[PointR++] = pdc( (pos+0.0)/uu - p1*i,-1);
  35.                 }
  36.         }
  37.         sort(FTime,FTime+PointR);
  38.         long double ans = 0;    
  39.         int balance = 0;
  40.         long double tpred = 0;
  41.         for (int i=0;i< PointR;i++){
  42.                 if (!balance)
  43.                         ans = max(ans, min(t2,FTime[i].first) - max(t1, tpred) );
  44. //clog << balance<<" "<<FTime[i].first<<" "<<FTime[i].second<<"  ---   "<<ans<<endl;
  45.                 balance += FTime[i].second;
  46.                 tpred = FTime[i].first;
  47.         }
  48.         if (FTime[PointR-1].first < t2)
  49.                 ans = max(ans, t2 - FTime[PointR-1].first );
  50.         cout<< setprecision(15) << ans<<endl;
  51. }
Success #stdin #stdout 0.04s 34360KB
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https://ideone.com/WXP06N
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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