Compilare: user.cpp: In function ‘int main()’: user.cpp:43:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ user.cpp:46:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&nr); ^ user.cpp:66:21: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (nr != first && nr != last){ ^ user.cpp:66:5: warning: ‘first’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (nr != first && nr != last){ ^