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Message: [QUOTE="Gavin Deane, post: 2543253"] Whether he compiled the code or not, Victor is correct. The code in question is list<int>::iterator t=p.begin(); if(i>n) return; for(int k=0;k<i;k++) { p.insert(t++,i); The first time this is executed, the list p is empty and so the iterator t is initialised to p.end() (which is the same thing as p.begin() for an empty container). Incrementing p.end(), as you do on the last line I have quoted, is undefined behaviour. Anything can happen, including exactly what you expect. I compiled and ran your code and the undefined behaviour manifested itself in a different way. The program crashed on that line. Purely because you were unlucky. Gavin Deane [/QUOTE]