Compilare: user.cpp: In function ‘void necesar(int)’: user.cpp:18:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<w[x].size();++i) ^ user.cpp: In function ‘void dfsplus(int)’: user.cpp:29:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();++i) ^ user.cpp: In function ‘void dfsminus(int)’: user.cpp:45:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<w[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:89:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<pa.size();++j) ^ user.cpp:93:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ra.size();++i) ^