Compilare: user.cpp: In function ‘int main()’: user.cpp:34:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graph[a].size(); ++i) { ^ user.cpp:17:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j= 0, a, b, ok, boss = 1; ^