Compilare: user.cpp: In function ‘void bfs(std::string&)’: user.cpp:21:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); i++) { ^ user.cpp: In function ‘void dfs(std::string&, std::string&)’: user.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) { ^ user.cpp:37:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(crr+1 == s2.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:52:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); i++) ^