/in/foo.cc: In function 'int suf(int, int)':
/in/foo.cc:18:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid=l+r>>1;
           ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:60:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    int mid=l+r>>1;
            ~^~