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 ‘bool 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:65:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) ^ user.cpp:68:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<vt[i].size();j++) ^ user.cpp:75:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<E[i].size();j++) ^ user.cpp:83:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<l[i].size();j++) ^