Compilare: user.cpp: In function ‘int calc(int, int)’: user.cpp:17:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vec[nod].size();i++) ^ user.cpp:29:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vec[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:60:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(t=0;t<vec[x].size();t++) ^ user.cpp: In function ‘int calc(int, int)’: user.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp:32:30: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] return calc(k,nod)+cost[nod]; ^