Compilare: main.cpp: In function 'void euler(int)': main.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<L[nnod].size() && nod!=L[nnod][j];j++); ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<L[i].size() && L[i][j]==-1;j++); ~^~~~~~~~~~~~ main.cpp:37:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] ok=!(j<L[i].size()); ~^~~~~~~~~~~~ main.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<s.size();i++) ~^~~~~~~~~