/in/foo.cc: In function 'void add(int, int, int, int, int)':
/in/foo.cc:25:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m=l+r>>1;
        ~^~
/in/foo.cc: In function 'int sum(int, int, int, int, int)':
/in/foo.cc:35:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m=l+r>>1;
        ~^~