/in/foo.cc:9:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:29:43: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
         printf("%d %d\n",way[i+1]+1,way[i]);
                          ~~~~~~~~~~       ^
/in/foo.cc:29:43: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long long int' [-Wformat=]