Hi Athanasius, I tried your suggestion but Im getting a partial output of only 25 lines (while the input file P17226.csv as provided is 2794 lines long).

This is what Im getting after trying your suggestion

Please check and suggest. 
                     M3<-Q,  Pl
                     M5<-Q,  Pl
                    M22<-Q,  Pl
                    M24<-Q,  Pl
                    M12<-Q,  Pl
                    M23<-Q,  Pl
                    M14<-Q,  Pl
                    M15<-Q,  Pl
                    M31<-Q,  Pl
                    M11<-Q,  Pl
                    M25<-Q,  Pl
                    M27<-Q,  Pl
                    M30<-Q,  Pl
                    M33<-Q,  E
                    M34<-Q,  E
                    M10<-Q,  E
                    M32<-Q,  E
                    M29<-Q,  E
                    M18<-Q,  E
                     M7<-Q,  E
                     M1<-Q,  E
                     M6<-Q,  E
                    M28<-Q,  E
                     M9<-Q,  E
                    M19<-Q,  P

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In reply to Re^2: Perl code for finding shortest path not working on large files (chomp) by zing
in thread Perl code for finding shortest path not working on large files by zing

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