/in/foo.cc: In function 'int main()':
/in/foo.cc:17:21: warning: unused variable 'cnt' [-Wunused-variable]
   17 |                 int cnt,x,ans,m=1,j;
      |                     ^~~
/in/foo.cc:17:27: warning: unused variable 'ans' [-Wunused-variable]
   17 |                 int cnt,x,ans,m=1,j;
      |                           ^~~
/in/foo.cc:9:24: warning: iteration 99999 invokes undefined behavior [-Waggressive-loop-optimizations]
    9 |                 if(!a[i])
      |                     ~~~^
/in/foo.cc:7:22: note: within this loop
    7 |         for(int i=2;i<=N;i++)
      |                     ~^~~