/in/foo.cc: In function 'int main()':
/in/foo.cc:6:14: warning: 't' is used uninitialized [-Wuninitialized]
    6 |     while (t != 0) {
      |            ~~^~~~
/in/foo.cc:4:27: note: 't' declared here
    4 |     int a[105], mark = 1, t;
      |                           ^