Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:36:2: error: ‘ifstream’ was not declared in this scope ifstream f("sdo.in"); ^ user.cpp:36:2: note: suggested alternative: In file included from /usr/local/include/c++/4.8.0/ios:38:0, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/local/include/c++/4.8.0/iosfwd:157:34: note: ‘std::ifstream’ typedef basic_ifstream<char> ifstream; ^ user.cpp:36:11: error: expected ‘;’ before ‘f’ ifstream f("sdo.in"); ^ user.cpp:37:2: error: ‘ofstream’ was not declared in this scope ofstream g("sdo.out"); ^ user.cpp:37:2: note: suggested alternative: In file included from /usr/local/include/c++/4.8.0/ios:38:0, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/local/include/c++/4.8.0/iosfwd:160:34: note: ‘std::ofstream’ typedef basic_ofstream<char> ofstream; ^ user.cpp:37:11: error: expected ‘;’ before ‘g’ ofstream g("sdo.out"); ^ user.cpp:38:2: error: ‘f’ was not declared in this scope f>>n>>k; ^ user.cpp:41:2: error: ‘g’ was not declared in this scope g<<quicksort(1,n); ^ user.cpp: In function ‘int quicksort(int, int)’: user.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type] } ^