Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:12:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void dfst(int)’: user.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vt[x].size();i++) ^ user.cpp: In function ‘void check(int)’: user.cpp:28:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int idx=0;idx<ET[x].size();idx++) ^ user.cpp: In function ‘int main()’: user.cpp:64:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) ^ user.cpp:67:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<vt[i].size();j++) ^ user.cpp:74:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<E[i].size();j++) ^ user.cpp:79:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(it=0;it<ap[i].size();it++) ^ user.cpp:85:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<l[nod].size();j++) ^