foo.cc: In function 'int main()':
foo.cc:50:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   50 |     scanf("%d%d%lld",&n,&m,&s);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:54:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   54 |         scanf("%d%d",&node[i].w,&node[i].va);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:58:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   58 |         scanf("%d%d",&que[i].li,&que[i].ri);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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