answer.code: In function ‘bool spfa()’:
answer.code:80:31: error: expected ‘}’ at end of input
   80 |     if (dis[T]==inf) return 0;
      |                               ^
answer.code:58:1: note: to match this ‘{’
   58 | {
      | ^
answer.code:80:31: warning: control reaches end of non-void function [-Wreturn-type]
   80 |     if (dis[T]==inf) return 0;
      |                               ^