Eroare de compilare: main.cpp: In function 'int main()': main.cpp:13:2: error: 'ifstream' was not declared in this scope {ifstream f("apm.in"); ^~~~~~~~ main.cpp:13:2: note: suggested alternative: In file included from /usr/include/c++/6/ios:38:0, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:1: /usr/include/c++/6/iosfwd:162:34: note: 'std::ifstream' typedef basic_ifstream<char> ifstream; ^~~~~~~~ main.cpp:14:1: error: 'ofstream' was not declared in this scope ofstream g("apm.out"); ^~~~~~~~ main.cpp:14:1: note: suggested alternative: In file included from /usr/include/c++/6/ios:38:0, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:1: /usr/include/c++/6/iosfwd:165:34: note: 'std::ofstream' typedef basic_ofstream<char> ofstream; ^~~~~~~~ main.cpp:15:1: error: 'f' was not declared in this scope f>>N>>M; ^ main.cpp:26:1: error: 'g' was not declared in this scope g<<c<<'\n'<<N-1<<'\n'; ^ Non zero exit status: 1