Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ^ user.cpp:37:10: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(jos[a[nod][i]]>0) ^ user.cpp: In function ‘int df1(int, int, int)’: user.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:88:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<b[c[i]].size();j++){ ^