/in/foo.cc: In function 'int poww(int, int, int)':
/in/foo.cc:7:15: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
         if(b&1!=0)
              ~^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:15:22: warning: unused variable 'ans' [-Wunused-variable]
     int n,m,k,x,cs=1,ans;
                      ^~~