foo.cc: In function 'void build(long long unsigned int, long long unsigned int, long long unsigned int)':
foo.cc:29:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
foo.cc: In function 'void chan(long long unsigned int, long long unsigned int, long long unsigned int)':
foo.cc:41:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=ln+rn>>1;
          ~~^~~
foo.cc: In function 'int main()':
foo.cc:58:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%llu%llu%llu",&a[i].h,&a[i].l,&a[i].z);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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