answer.code: In function ‘void wk()’:
answer.code:62:33: error: ‘T’ was not declared in this scope
   62 |         printf("Case #%d: %d\n",T,len);
      |                                 ^
answer.code: In function ‘int main()’:
answer.code:68:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   68 |         scanf("%d",&t);
      |         ~~~~~^~~~~~~~~
answer.code:74:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   74 |                 scanf("%d%d",&n,&m);
      |                 ~~~~~^~~~~~~~~~~~~~
answer.code:76:30: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   76 |                         scanf("%d%d",&x,&e[i].y);
      |                         ~~~~~^~~~~~~~~~~~~~~~~~~