foo.cc: In function ‘int main()’:
foo.cc:44:25: warning: ‘t’ may be used uninitialized [-Wmaybe-uninitialized]
   44 |                 for(int t=a[t];t>=1;t--)
      |                         ^
foo.cc:44:25: note: ‘t’ was declared here
   44 |                 for(int t=a[t];t>=1;t--)
      |                         ^