/in/foo.cc: In function 'int main()':
/in/foo.cc:134:9: warning: 'tt' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ed[ff] = tt;
  ~~~~~~~^~~~
/in/foo.cc:119:10: note: 'tt' was declared here
  int ss, tt;
          ^~
/in/foo.cc:133:9: warning: 'ss' may be used uninitialized in this function [-Wmaybe-uninitialized]
  st[ff] = ss;
  ~~~~~~~^~~~
/in/foo.cc:119:6: note: 'ss' was declared here
  int ss, tt;
      ^~