Compilare: user.cpp: In function ‘int main()’: user.cpp:32:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[x].size(); ++i) { ^ user.cpp: In function ‘void dfs(int, int)’: user.cpp:69:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[x].size(); ++i) { ^