/in/foo.cc: In function 'void SPFA()':
/in/foo.cc:47:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0;k<g[i].size();k++){
               ~^~~~~~~~~~~~
/in/foo.cc:48:20: warning: unused variable 's' [-Wunused-variable]
    int j=g[i][k].j,s=g[i][k].s,t=g[i][k].t;
                    ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:78:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
      printf("%d\n",dist[i]);
                           ^