Compilare: user.cpp: In function ‘int main()’: user.cpp:10:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:11:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) fscanf(fin,"%d",&a[i]); ^ user.cpp:34:22: warning: ‘posinc’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=posinc-1;i>=0;i--) ^