Compilare: user.cpp: In function ‘bool found(int, int)’: user.cpp:19:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:53:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[i].size(); j++) { ^