What if `start` is greater than `end` ?

[renxian]

When I use a instance with small customers for example 15, then start is greater than end. so the while loop can't be stopped.
Don't we need to check whether start is greater than end?

HGS-CVRP/Program/Genetic.cpp

Lines 48 to 63 in 2d4d673

 // Picking the beginning and end of the crossover zone 
 std::uniform_int_distribution<> distr(0, params.nbClients-1); 
 int start = distr(params.ran); 
 int end = distr(params.ran); 
  
 // Avoid that start and end coincide by accident 
 while (end == start) end = distr(params.ran); 
  
 // Copy from start to end 
 int j = start; 
 while (j % params.nbClients != (end + 1) % params.nbClients) 
 { 
 	result.chromT[j % params.nbClients] = parent1.chromT[j % params.nbClients]; 
 	freqClient[result.chromT[j % params.nbClients]] = true; 
 	j++; 
 }