Eroare de compilare: user.cpp:3:1: error: ‘ifstream’ does not name a type ifstream f("algsort.in") ^ user.cpp: In function ‘int main()’: user.cpp:46:5: error: ‘f’ was not declared in this scope { f>>n; ^ user.cpp:46:8: error: ‘n’ was not declared in this scope { f>>n; ^ user.cpp:47:9: error: ‘i’ was not declared in this scope for(i=1;i<=n;i++) ^ user.cpp:48:6: error: ‘a’ was not declared in this scope f>>a[i]; ^ user.cpp:49:12: error: ‘a’ was not declared in this scope mergesort(a,b,1,n); ^ user.cpp:49:14: error: ‘b’ was not declared in this scope mergesort(a,b,1,n); ^ user.cpp:51:9: error: ‘g’ was not declared in this scope g<<a[i]<<" "; ^ user.cpp:52:5: error: ‘g’ was not declared in this scope g<<endl; ^ user.cpp:52:8: error: ‘endl’ was not declared in this scope g<<endl; ^ user.cpp:52:8: note: suggested alternative: In file included from /usr/local/include/c++/4.8.0/iostream:39:0, from user.cpp:1: /usr/local/include/c++/4.8.0/ostream:564:5: note: ‘std::endl’ endl(basic_ostream<_CharT, _Traits>& __os) ^