Compilare: user.cpp: In function ‘void current_path()’: user.cpp:49:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < path.size() ; ++ i) ^ user.cpp:54:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < path.size() ; ++ i) ^ user.cpp:63:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = lst ; i < path.size() ; ++ i){ ^ user.cpp:64:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(bad[i] || i == path.size() - 1){ ^ user.cpp: In function ‘int main()’: user.cpp:116:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < alone.size() ; i += 2) ^