Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vec[nod].size(); i++){ ~~^~~~~~~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int)’: user.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++){ ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < vec[i].size(); j++){ ~~^~~~~~~~~~~~~~~ user.cpp:86:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[nod].size(); j++){ ~~^~~~~~~~~~~~~~~