Cod sursă (job #470676)

#include<bits/stdc++.h>
using namespace std;
int  norma,ratie,ziua ,d,cost,tcost,kg;
int main(){
    int SCV = 1 ;
    freopen( "scv.in" , "r" , stdin ) ;
    freopen( "scv.out" , "w" , stdout ) ;
    cin>>cost>>tcost>>kg>>norma;
    if( cost % kg == 0 )
      {
       ratie = cost ;
       ziua = cost / kg ;
      }
    else
       {
        ratie = ( cost / kg  + 1 ) * kg ;
        ziua = cost / kg + 1 ;
       }
    while( ( norma - ratie ) / ( SCV * kg ) >= ( norma - ratie + cost - SCV * kg * tcost ) / ( ( SCV + 1 ) * kg  ) + tcost && ratie < norma )
         {
          ++ SCV ;
          ratie = ratie - cost ;
          ziua = ziua + tcost ;
          ratie = ratie + ( SCV - 1 ) * kg * tcost ;

          if( ratie < cost )
            {
             if( ( cost - ratie ) % ( SCV * kg ) == 0 )
                d = ( cost - ratie ) / ( SCV * kg ) ;
             else
                d = ( cost - ratie ) / ( SCV * kg ) + 1 ;

             ratie = ratie + kg * SCV * d ;
             ziua = ziua + d ;
            }
         }
    if(norma>ratie){
       if((norma-ratie)%(SCV*kg)==0)
          d=(norma-ratie)/(SCV*kg);
       else
          d=(norma-ratie)/(SCV*kg)+1;

       ziua=ziua+d;
      }
    cout<<ziua-2;
    return 0 ;
}