Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:17:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0;t<vec[x].size();t++) ^ user.cpp: In function ‘void dfs1(int)’: user.cpp:26:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0;t<vecr[x].size();t++) ^ user.cpp: In function ‘int main()’: user.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<ans[i].size();j++) ^