Compilare: main.cpp: In function 'bool bell(int, int)': main.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses] N[i]=f[i]=s[i]=0; ^ main.cpp: In function 'bool bell(int, int)': main.cpp:48:1: warning: control reaches end of non-void function [-Wreturn-type] } ^