Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:18: 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:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vt[x].size();i++) ^ user.cpp: In function ‘void defeseu(int)’: user.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[x].size();i++) ^ user.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[x].size();i++) ^ user.cpp:64:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A[x].size();i++) ^ user.cpp:66:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:95:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<l[i].size();j++) ^ user.cpp:98:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<v[x].size();k++) ^