Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:47:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<c[i].size();j++) ~^~~~~~~~~~~~ user.cpp:51:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j<c[i].size()-1)n2=c[i][j+1]; ~^~~~~~~~~~~~~~ user.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<w[n1].size();k++) ~^~~~~~~~~~~~~ user.cpp:60:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k!=w[n1].size())continue; ~^~~~~~~~~~~~~~ user.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<w[n2].size();k++) ~^~~~~~~~~~~~~ user.cpp:75:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<inv.size();i++) ~^~~~~~~~~~~