Compilare: user.cpp: In function ‘int factor()’: user.cpp:43:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0;i<nr.size();i++) ^ user.cpp:94:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:100:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,100001,fp); ^ user.cpp: In function ‘int factor()’: user.cpp:45:21: warning: ‘sum’ may be used uninitialized in this function [-Wmaybe-uninitialized] sum+=nr[i]; ^