Compilare: user.cpp: In function ‘void Euler(int)’: user.cpp:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (u = 0; u < graf[v].size(); u++) { ~~^~~~~~~~~~~~~~~~ user.cpp:56:18: warning: unused variable ‘l’ [-Wunused-variable] int newV, u, l, nn; ^ user.cpp:56:21: warning: unused variable ‘nn’ [-Wunused-variable] int newV, u, l, nn; ^~ user.cpp: In function ‘int main()’: user.cpp:75:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^