Compilare: user.cpp: In function ‘bool bf()’: user.cpp:44:42: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(!viz[neigh]&p[node][neigh]>fl[node][neigh]) ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ user.cpp: In function ‘void EK()’: user.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graph[n].size();i++) ~^~~~~~~~~~~~~~~~ user.cpp: In function ‘void df(int, int)’: user.cpp:86:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graph[start].size();i++) ~^~~~~~~~~~~~~~~~~~~~