foo.cc: In member function 'void prt::build(int&, int, int)':
foo.cc:19:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   19 |     int m=l+r>>1;
      |           ~^~
foo.cc: In member function 'void prt::ins(int&, int, int, int, int, node)':
foo.cc:26:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   26 |     int m=l+r>>1;
      |           ~^~
foo.cc: In member function 'node prt::ask(int, int, int, int, int)':
foo.cc:32:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   32 |     int m=l+r>>1;
      |           ~^~
foo.cc: In function 'void ST()':
foo.cc:57:52: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   57 |             st[k][i]=gmd(st[k-1][i],st[k-1][i+(1<<k-1)]);
      |                                                   ~^~

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