Eroare de compilare: main.cpp: In function 'void backtrack(int)': main.cpp:10:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | for(int j = 0; j < subset.size(); ++j){ | ~~^~~~~~~~~~~~~~~ main.cpp:11:23: error: reference to 'cout' is ambiguous 11 | if(j) cout << " "; | ^~~~ In file included from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:75, from main.cpp:1: /usr/include/c++/12.2.1/iostream:61:18: note: candidates are: 'std::ostream std::cout' 61 | extern ostream cout; /// Linked to standard output | ^~~~ main.cpp:4:10: note: 'std::ofstream cout' 4 | ofstream cout("submultimi.out"); | ^~~~ main.cpp:12:17: error: reference to 'cout' is ambiguous 12 | cout << subset[j]; | ^~~~ /usr/include/c++/12.2.1/iostream:61:18: note: candidates are: 'std::ostream std::cout' 61 | extern ostream cout; /// Linked to standard output | ^~~~ main.cpp:4:10: note: 'std::ofstream cout' 4 | ofstream cout("submultimi.out"); | ^~~~ main.cpp:14:13: error: reference to 'cout' is ambiguous 14 | cout << "\n"; | ^~~~ /usr/include/c++/12.2.1/iostream:61:18: note: candidates are: 'std::ostream std::cout' 61 | extern ostream cout; /// Linked to standard output | ^~~~ main.cpp:4:10: note: 'std::ofstream cout' 4 | ofstream cout("submultimi.out"); | ^~~~ main.cpp: In function 'int main()': main.cpp:26:5: error: reference to 'cin' is ambiguous 26 | cin >> n; | ^~~ /usr/include/c++/12.2.1/iostream:60:18: note: candidates are: 'std::istream std::cin' 60 | extern istream cin; /// Linked to standard input | ^~~ main.cpp:3:10: note: 'std::ifstream cin' 3 | ifstream cin("submultimi.in"); | ^~~ Non zero exit status: 1