/in/foo.cc: In function 'void B(int, int, int)':
/in/foo.cc:8:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'void C(int)':
/in/foo.cc:26:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=L[o]+R[o]>>1;
          ~~~~^~~~~