Compilare: user.cpp: In function ‘void read()’: user.cpp:14:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:16:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&a[i].l,&a[i].g); ^ user.cpp: In function ‘void solve()’: user.cpp:68:23: warning: ‘maxnr’ may be used uninitialized in this function [-Wmaybe-uninitialized] output(maxi,maxnr); ^ user.cpp:68:23: warning: ‘maxi’ may be used uninitialized in this function [-Wmaybe-uninitialized]