foo.cc: In function ‘int main()’:
foo.cc:20:17: warning: ‘k’ may be used uninitialized [-Wmaybe-uninitialized]
   20 |                 if(j!=k) ans+=a[j];
      |                 ^~
foo.cc:10:9: note: ‘k’ was declared here
   10 |     int k;
      |         ^