Compilare: user.cpp: In function ‘int main()’: user.cpp:79:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < Graf[1].size(); i++) { ^ user.cpp:94:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < Graf[x].size(); i++) ^