foo.cc: In function ‘int main()’:
foo.cc:7:19: warning: unused variable ‘ans’ [-Wunused-variable]
    7 |         int k,now,ans,x;
      |                   ^~~
foo.cc:7:23: warning: unused variable ‘x’ [-Wunused-variable]
    7 |         int k,now,ans,x;
      |                       ^