Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:41:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ind=0;ind<v[x].size();ind++) ^ user.cpp: In function ‘void destroy()’: user.cpp:83:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(it=0;it<q[j].size();it++) ^ user.cpp: In function ‘int getnum()’: user.cpp:97:17: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(str[c]>='0'&str[c]<='9') ^