Compilare: main.cpp: In function 'void dijkstra()': main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[p.first].size();i++) ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:15: warning: unused variable 'x' [-Wunused-variable] int a,b,k,x; ^