Compilare: main.cpp: In function 'void Euler(int)': main.cpp:48:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v[i].size(); ++j){ ~^~~~~~~~~~~~ main.cpp:52:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(jj=0; jj<v[nod].size(); ++jj){ ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:12: warning: unused variable 'j' [-Wunused-variable] int i, j, x, y, r, ii, jj, dir; ^