int i4_max ( int i1, int i2 );
int i4_min ( int i1, int i2 );
void i4mat_print ( int m, int n, int a[], string title );
void i4mat_print_some ( int m, int n, int a[], int ilo, int jlo, int ihi,
  int jhi, string title );
void invmod ( int mat[], int imat[], int rmod[], int cmod[], int nrow, 
  int &ifault );
void msort ( int mat[], int imat[], int rmod[], int cmod[], int rsort[], 
  int csort[], int nrow );
void musort ( int mat[], int imat[], int rmod[], int cmod[], int rsort[], 
  int csort[], int nrow );
void timestamp ( );