Compilare: user.cpp: In function ‘int df(int)’: user.cpp:38:15: warning: suggest parentheses around assignment used as truth value [-Wparentheses] viz[node] = nr[node] = 1; ^ user.cpp:39:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();++i) ^ user.cpp: In function ‘void df_min(int, int)’: user.cpp:61:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();++i) ^ user.cpp: In function ‘int df_heap(int)’: user.cpp:68:15: warning: suggest parentheses around assignment used as truth value [-Wparentheses] viz[node] = nr[node] = 1; ^ user.cpp:69:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();++i) ^