foo.cc: In function ‘int main()’:
foo.cc:25:17: warning: ‘ok’ may be used uninitialized [-Wmaybe-uninitialized]
   25 |                 if(ok==1)
      |                 ^~
foo.cc:5:23: note: ‘ok’ was declared here
    5 |         long long n,m,ok,a[10005];
      |                       ^~