Compilare: user.cpp: In function ‘int main()’: user.cpp:37:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[node].size(); i++) { ^ user.cpp:59:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[node].size(); i++) { ^