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The routine CPXgetnodeleftcnt accesses the number
 of unexplored nodes left in the branch & cut tree. 
Example
nodes_left = CPXgetnodeleftcnt (env, lp);
| env | A pointer to the CPLEX environment as returned by   | 
| lp | A pointer to a CPLEX problem object as returned by   | 
CPXgetnodeleftcnt returns 0 (zero); otherwise, CPXgetnodeleftcnt returns the number of unexplored nodes left in the branch & cut tree.