/in/foo.cc: In function 'int main()':
/in/foo.cc:31:10: warning: 't2' may be used uninitialized [-Wmaybe-uninitialized]
   31 |         t=t2-t1;
      |         ~^~~~~~
/in/foo.cc:5:28: note: 't2' was declared here
    5 |         int y1,y2,r1,r2,t1,t2,t;
      |                            ^~
/in/foo.cc:31:10: warning: 't1' may be used uninitialized [-Wmaybe-uninitialized]
   31 |         t=t2-t1;
      |         ~^~~~~~
/in/foo.cc:5:25: note: 't1' was declared here
    5 |         int y1,y2,r1,r2,t1,t2,t;
      |                         ^~