Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[nod].size(); ++i){ ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘void dfs_t(int, int)’: user.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[nod].size(); ++i){ ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:71:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < c.size(); ++i){ ~~^~~~~~~~~~