Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:29: 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:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vt[x].size();i++) ^ user.cpp: In function ‘void dfsn(int)’: user.cpp:31:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vn[x].size();i++) ^ user.cpp: In function ‘void build_ctc()’: user.cpp:43:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) ^ user.cpp:59:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idx=0;idx<vn[nodul].size();idx++) ^