Eroare de compilare: user.cpp: In function ‘void quick(int, int)’: user.cpp:16:31: warning: operation on ‘v[b]’ may be undefined [-Wsequence-point] v[c]=v[b]^v[c]^(v[b]=v[c]); ^ user.cpp:21:35: warning: operation on ‘v[j]’ may be undefined [-Wsequence-point] v[i]=v[j]^v[i]^(v[j]=v[i]); ^ user.cpp:25:31: warning: operation on ‘v[b]’ may be undefined [-Wsequence-point] v[i]=v[b]^v[i]^(v[b]=v[i]); ^ user.cpp: In function ‘int main()’: user.cpp:38:9: error: ‘cin’ was not declared in this scope cin>>v[i]; ^