foo.cc: In function 'void change(long long int&, long long int, long long int, long long int)':
foo.cc:30:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   30 |     int mid=l+r>>1;
      |             ~^~
foo.cc: In function 'long long int query(long long int, long long int, long long int, long long int)':
foo.cc:44:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   44 |     int mid=l+r>>1;
      |             ~^~
foo.cc: In function 'void add(long long int)':
foo.cc:63:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   63 |         int mid=l+r>>1;
      |                 ~^~
foo.cc: In function 'int main()':
foo.cc:90:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<node>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   90 |     for(int i=0;i<q.size();i++)
      |                 ~^~~~~~~~~

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