Compilare: user.cpp: In function ‘void topo(int)’: user.cpp:20:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m[x].size();++i) { ^ user.cpp: In function ‘void kids(int)’: user.cpp:31:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m[x].size();++i) { ^ user.cpp: In function ‘void parents(int)’: user.cpp:43:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n[x].size();++i) { ^ user.cpp: In function ‘int main()’: user.cpp:77:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<t.size();++i) { ^ user.cpp:81:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(t.size()-i!=p[t[i]]) { ^