Compilare: user.cpp: In function ‘int main()’: user.cpp:44:72: warning: unused variable ‘a1’ [-Wunused-variable] int arie=1+v[ap[i-1][j]]+v[ap[i+1][j]]+v[ap[i][j-1]]+v[ap[i][j+1]],a1=0,a2=0,a3=0,a4=0; ^ user.cpp:44:87: warning: variable ‘a4’ set but not used [-Wunused-but-set-variable] int arie=1+v[ap[i-1][j]]+v[ap[i+1][j]]+v[ap[i][j-1]]+v[ap[i][j+1]],a1=0,a2=0,a3=0,a4=0; ^ user.cpp:24:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d%d%*c",&n,&m); ^ user.cpp:26:50: 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 (f,"%s%*c",a[i]+1); ^