foo.cc: In member function 'void Chairman_Tree::build(int, int, int&)':
foo.cc:45:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   45 |   int mid=l+r>>1;
      |           ~^~
foo.cc: In member function 'void Chairman_Tree::add(int, int, int, int, int&, int, int)':
foo.cc:59:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   59 |   int mid=l+r>>1;
      |           ~^~
foo.cc: In member function 'long long int Chairman_Tree::ask(int, int, int, int, int)':
foo.cc:67:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   67 |   int mid=l+r>>1;
      |           ~^~
foo.cc: In function 'int main()':
foo.cc:82:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   82 |   scanf("%s",s);
      |   ~~~~~^~~~~~~~

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Found 6 testcases.
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