Compilare: main.cpp: In function 'void rec(int, long long int)': main.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int fil(int, int, int)': main.cpp:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:23:9: warning: unused variable 'x' [-Wunused-variable] int x; ^ main.cpp:26:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(x=0;x<a[j].size();x++){ ~^~~~~~~~~~~~