Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:42:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<aux.size();i++)lefto[i]=(lefto[i-1]*(dyn[0][aux[i]]+dyn[1][aux[i]]))%mod; ^ user.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<aux.size();i++) ^ user.cpp:48:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<aux.size()-1)ans=(ans*righto[i+1])%mod; ^