Compilare: user.cpp: In function ‘void Euler()’: user.cpp:52:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (R[i]<G[i].size() && F[G[i][R[i]].in]==1) ^ user.cpp:55:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (R[i]<G[i].size()) ^ user.cpp: In function ‘int main()’: user.cpp:84:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1; i<imp.size(); i+=2) ^ user.cpp:115:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<ANS.size(); i++) ^ user.cpp:119:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<ANS.size(); i++) ^ user.cpp:122:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<ANS[i].size(); j++) ^ user.cpp:97:10: warning: unused variable ‘first’ [-Wunused-variable] bool first=1; ^