/in/foo.cc: In function 'int main()':
/in/foo.cc:5:12: warning: 't' is used uninitialized [-Wuninitialized]
    5 |     while(t!=0)
      |           ~^~~
/in/foo.cc:4:22: note: 't' declared here
    4 |     int a[105],sum=1,t;
      |                      ^