/in/foo.cc: In function 'int main()':
/in/foo.cc:66:14: warning: 'b2' may be used uninitialized [-Wmaybe-uninitialized]
   66 |         a=crt(a1,w1,b2,w2),b=crt(b1,w1,a2,w2);
      |           ~~~^~~~~~~~~~~~~
/in/foo.cc:41:17: note: 'b2' was declared here
   41 |     ll a1,b1,a2,b2;
      |                 ^~
/in/foo.cc:66:33: warning: 'a2' may be used uninitialized [-Wmaybe-uninitialized]
   66 |         a=crt(a1,w1,b2,w2),b=crt(b1,w1,a2,w2);
      |                              ~~~^~~~~~~~~~~~~
/in/foo.cc:41:14: note: 'a2' was declared here
   41 |     ll a1,b1,a2,b2;
      |              ^~
/in/foo.cc:66:33: warning: 'b1' may be used uninitialized [-Wmaybe-uninitialized]
   66 |         a=crt(a1,w1,b2,w2),b=crt(b1,w1,a2,w2);
      |                              ~~~^~~~~~~~~~~~~
/in/foo.cc:41:11: note: 'b1' was declared here
   41 |     ll a1,b1,a2,b2;
      |           ^~
/in/foo.cc:66:14: warning: 'a1' may be used uninitialized [-Wmaybe-uninitialized]
   66 |         a=crt(a1,w1,b2,w2),b=crt(b1,w1,a2,w2);
      |           ~~~^~~~~~~~~~~~~
/in/foo.cc:41:8: note: 'a1' was declared here
   41 |     ll a1,b1,a2,b2;
      |        ^~