Compilare: user.cpp: In function ‘int main()’: user.cpp:51:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<doi[i].size();++j) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:63:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[x].size();++i) ^ user.cpp: In function ‘void dfst(int)’: user.cpp:77:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gt[x].size();++i) ^