Code cannot solve a particular 4x4 matrix

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What steps will reproduce the problem?
Using the following matrix:
  /* an example cost matrix */
  int r[4*4] =  {20,20,10,10,   10,10,30,20,    10,10,10,20,    20,20,30,10};
  std::vector< std::vector<int> > m = array_to_matrix(r,4,4);

  /* initialize the hungarian_problem using the cost matrix*/
  Hungarian hungarian(m , 4,4, HUNGARIAN_MODE_MINIMIZE_COST) ;


What is the expected output? What do you see instead?
Expect a solution. Instead see an error that it cannot solve.

What version of the product are you using? On what operating system?


Please provide any additional information below.

Original issue reported on code.google.com by sprou...@gmail.com on 16 Oct 2013 at 9:11