Compilare: user.cpp: In function ‘int main()’: user.cpp:10:34: warning: format ‘%s’ expects argument of type ‘char*’, but argument 5 has type ‘char (*)[1000003]’ [-Wformat=] fscanf(in,"%d %d %s",&n,&m,&s); ^ user.cpp:28:10: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] v[m] = NULL; ^ user.cpp:10:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %s",&n,&m,&s); ^