/in/foo.cc: In function 'void rd()':
/in/foo.cc:31:31: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'int*' [-Wformat=]
  scanf("%lld%lld%lld",&n,&m,&k); 
                               ^
/in/foo.cc:31:31: warning: format '%lld' expects argument of type 'long long int*', but argument 3 has type 'int*' [-Wformat=]
/in/foo.cc:31:31: warning: format '%lld' expects argument of type 'long long int*', but argument 4 has type 'int*' [-Wformat=]
/in/foo.cc: In function 'int main()':
/in/foo.cc:73:12: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized]
    if(dis[u] + b[j].l < dis[b[j].y])
       ~~~~~^