Compilare: user.cpp: In function ‘void build(std::string&)’: user.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p != s.size()) { ^ user.cpp: In function ‘void dfs(std::string&)’: user.cpp:69:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p != s.size()) { ^ user.cpp: In function ‘void antibfs()’: user.cpp:88:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans[crr].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:106:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans[tim].size(); i++) ^