Compilare: user.cpp: In function ‘int sterge(int)’: user.cpp:32:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<H[unde].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:59:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] else if(op==3) ^ user.cpp:56:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] else if(op==2) ^ user.cpp:53:6: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(op==1) ^