/in/foo.cc: In function 'int main()':
/in/foo.cc:20:22: warning: 't' may be used uninitialized [-Wmaybe-uninitialized]
   20 |     str2=str.substr(t+2,l-t-2);
      |                     ~^~
/in/foo.cc:10:22: note: 't' was declared here
   10 |     int l=str.size(),t;
      |                      ^