Compilare: main.cpp: In function 'void euler(int)': main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( ; nv[nod] < g[nod].size(); ) ~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:18:7: warning: unused variable 'i' [-Wunused-variable] int i; ^ main.cpp: In function 'int main()': main.cpp:36:10: warning: unused variable 'j' [-Wunused-variable] int i, j, a, b; ^