Compilare: user.cpp: In function ‘void topo(int)’: user.cpp:14:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m[x].size();++i) { ^ user.cpp: In function ‘void topo2(int)’: user.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n[x].size();++i) { ^ user.cpp: In function ‘void kids(int)’: user.cpp:40:29: 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:56:29: 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:113:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<t2.size();++i) { ^