/in/foo.cc: In function 'int main()':
/in/foo.cc:35:18: warning: 't4' may be used uninitialized in this function [-Wmaybe-uninitialized]
      ll t1,t2,t3,t4;
                  ^~
/in/foo.cc:35:15: warning: 't3' may be used uninitialized in this function [-Wmaybe-uninitialized]
      ll t1,t2,t3,t4;
               ^~
/in/foo.cc:35:12: warning: 't2' may be used uninitialized in this function [-Wmaybe-uninitialized]
      ll t1,t2,t3,t4;
            ^~
/in/foo.cc:35:9: warning: 't1' may be used uninitialized in this function [-Wmaybe-uninitialized]
      ll t1,t2,t3,t4;
         ^~