Compilare: main.cpp: In function 'void mo(int, int, int)': main.cpp:41:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<zn[z].size();++i) ~^~~~~~~~~~~~~ main.cpp:37:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^ main.cpp: In function 'int main()': main.cpp:61:15: warning: unused variable 'j' [-Wunused-variable] int n,m,i,j; ^