foo.cc: In function 'void update(int, int)':
foo.cc:25:13: error: 'now' was not declared in this scope
   25 |         if (now.dis + i->dis < dis[i->id]) Q.push(node(i->id, dis[i->id] = now.dis + i->dis));
      |             ^~~
foo.cc:25:23: error: 'i' was not declared in this scope; did you mean 'id'?
   25 |         if (now.dis + i->dis < dis[i->id]) Q.push(node(i->id, dis[i->id] = now.dis + i->dis));
      |                       ^
      |                       id

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