Compilare: user.cpp: In function ‘int main()’: user.cpp:36:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol[i].size();j++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:57:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<gi[z].size(); i++) ^ user.cpp: In function ‘void dfst(int)’: user.cpp:67:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<gt[z].size(); i++) ^