/in/foo.cc: In function 'bool check(long long int)':
/in/foo.cc:16:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    ll m=ri+le>>1;
         ~~^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:44:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   mid=l+r>>1;
       ~^~