Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:2:141: error: conflicting declaration ‘int i’ using namespace std;int e(int a, int b){if(!b) return a;e(b,a%b);}int main(){ ifstream i("euclid2.in"); ofstream o("euclid2.out");int t,a,b,i;in>>t;for (i=0;i<t;i++){i>>a>>b;o<<e(a,b)<<'\n';}in.close();out.close();return 0;} ^ user.cpp:2:88: error: ‘i’ has a previous declaration as ‘std::ifstream i’ using namespace std;int e(int a, int b){if(!b) return a;e(b,a%b);}int main(){ ifstream i("euclid2.in"); ofstream o("euclid2.out");int t,a,b,i;in>>t;for (i=0;i<t;i++){i>>a>>b;o<<e(a,b)<<'\n';}in.close();out.close();return 0;} ^ user.cpp:2:143: error: ‘in’ was not declared in this scope using namespace std;int e(int a, int b){if(!b) return a;e(b,a%b);}int main(){ ifstream i("euclid2.in"); ofstream o("euclid2.out");int t,a,b,i;in>>t;for (i=0;i<t;i++){i>>a>>b;o<<e(a,b)<<'\n';}in.close();out.close();return 0;} ^ user.cpp:2:155: error: no match for ‘operator=’ (operand types are ‘std::ifstream {aka std::basic_ifstream<char>}’ and ‘int’) using namespace std;int e(int a, int b){if(!b) return a;e(b,a%b);}int main(){ ifstream i("euclid2.in"); ofstream o("euclid2.out");int t,a,b,i;in>>t;for (i=0;i<t;i++){i>>a>>b;o<<e(a,b)<<'\n';}in.close();out.close();return 0;} ^ user.cpp:2:155: note: candidate is: In file included from user.cpp:1:0: /usr/include/c++/4.8/fstream:427:11: note: std::basic_ifstream<char>& std::basic_ifstream<char>::operator=(const std::basic_ifstream<char>&) <deleted> class basic_ifstream : public basic_istream<_CharT, _Traits> ^ /usr/include/c++/4.8/fstream:427:11: note: no known conversion for argument 1 from ‘int’ to ‘const std::basic_ifstream<char>&’ user.cpp:2:159: error: no match for ‘operator<’ (operand types are ‘std::ifstream {aka std::basic_ifstream<char>}’ and ‘int’) using namespace std;int e(int a, int b){if(!b) return a;e(b,a%b);}int main(){ ifstream i("euclid2.in"); ofstream o("euclid2.out");int t,a,b,i;in>>t;for (i=0;i<t;i++){i>>a>>b;o<<e(a,b)<<'\n';}in.close();out.close();return 0;} ^ user.cpp:2:159: note: candidates are: In file included from /usr/include/c++/4.8/bits/stl_algobase.h:64:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/istream:38, from /usr/include/c++/4.8/fstream:38, from user.cpp:1: /usr/include/c++/4.8/bits/stl_pair.h:220:5: note: template<class _T1, class _T2> constexpr bool std::operator<(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&) operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) ^ /usr/include/c++/4.8/bits/stl_pair.h:220:5: note: template argument deduction/substitution failed: user.cpp:2:160: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::pair<_T1, _T2>’ using namespace std;int e(int a, int b){if(!b) return a;e(b,a%b);}int main(){ ifstream i("euclid2.in"); ofstream o("euclid2.out");int t,a,b,i;in>>t;for (i=0;i<t;i++){i>>a>>b;o<<e(a,b)<<'\n';}in.close();out.close();return 0;} ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/istream:38, from /usr/include/c++/4.8/fstream:38, from user.cpp:1: /usr/include/c++/4.8/bits/stl_iterator.h:297:5: note: template<class _Iterator> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&) operator<(const reverse_iterator<_Iterator>& __x, ^ /usr/include/c++/4.8/bits/stl_iterator.h:297:5: note: template argument deduction/substitution failed: user.cpp:2:160: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::reverse_iterator<_Iterator>’ using namespace std;int e(int a, int b){if(!b) return a;e(b,a%b);}int main(){ ifstream i("euclid2.in"); ofstream o("euclid2.out");int t,a,b,i;in>>t;for (i=0;i<t;i++){i>>a>>b;o<<e(a,b)<<'\n';}in.close();out.close();return 0;} ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,