answer.code: In function ‘void dfs(int, int, int, int)’:
answer.code:52:25: error: ‘la’ was not declared in this scope; did you mean ‘a’?
   52 |                 bb[i]=0;la--;
      |                         ^~
      |                         a
answer.code: In function ‘int main()’:
answer.code:60:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   60 |         scanf("%d",&T);
      |         ~~~~~^~~~~~~~~
answer.code:64:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   64 |                 scanf("%d%d",&a,&b);
      |                 ~~~~~^~~~~~~~~~~~~~