Compilare: user.cpp: In function ‘void dvd(int, int, int&)’: user.cpp:14:39: warning: operation on ‘v[j]’ may be undefined [-Wsequence-point] v[i]=v[i]^v[j]^(v[j]=v[i]); ^ user.cpp:15:29: warning: operation on ‘pj’ may be undefined [-Wsequence-point] pi=pi^pj^(pj=pi); ^ user.cpp: In function ‘int main()’: user.cpp:40:11: warning: unused variable ‘x’ [-Wunused-variable] int i,x; ^ user.cpp:42:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&k); ^ user.cpp:44:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d", &v[i]); ^