Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:23:2: error: ‘ifstream’ was not declared in this scope {ifstream f("swap.in"); ^ user.cpp:23:2: note: suggested alternative: In file included from /usr/include/c++/4.8/ios:38:0, 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/iosfwd:157:34: note: ‘std::ifstream’ typedef basic_ifstream<char> ifstream; ^ user.cpp:23:11: error: expected ‘;’ before ‘f’ {ifstream f("swap.in"); ^ user.cpp:24:1: error: ‘ofstream’ was not declared in this scope ofstream g("swap.out"); ^ user.cpp:24:1: note: suggested alternative: In file included from /usr/include/c++/4.8/ios:38:0, 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/iosfwd:160:34: note: ‘std::ofstream’ typedef basic_ofstream<char> ofstream; ^ user.cpp:24:10: error: expected ‘;’ before ‘g’ ofstream g("swap.out"); ^ user.cpp:25:1: error: ‘f’ was not declared in this scope f>>s1; ^ user.cpp:27:12: error: ‘strlen’ was not declared in this scope n=strlen(s1); ^ user.cpp:41:26: error: ‘g’ was not declared in this scope merge(r,0,n-1,&l),g<<l; ^ user.cpp:43:8: error: ‘g’ was not declared in this scope g<<"-1"; ^