Compilare: user.cpp: In function ‘void bfs()’: user.cpp:23:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<vecin[curent].size();i++) ^ user.cpp:7:14: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] #define inf 1<<31 -1 ^ user.cpp:26:54: note: in expansion of macro ‘inf’ if (cost[urmator] == inf) ^ user.cpp: In function ‘int main()’: user.cpp:7:14: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] #define inf 1<<31 -1 ^ user.cpp:51:26: note: in expansion of macro ‘inf’ cost[j]=inf; ^ user.cpp:7:14: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] #define inf 1<<31 -1 ^ user.cpp:57:36: note: in expansion of macro ‘inf’ if(cost[j]==inf) cost[j]=-1; ^