/in/foo.cc: In function 'long long int dp(long long int)':
/in/foo.cc:43:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    mid=l+r>>1;
        ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:62:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   mid=l+r>>1;
       ~^~
/in/foo.cc:67:9: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
  dp(ans);
         ^