/in/foo.cc: In function 'int main()':
/in/foo.cc:45:30: warning: 'mj3' may be used uninitialized in this function [-Wmaybe-uninitialized]
   a[++num]=a[mj]+a[mj2]+a[mj3];
                         ~~~~~^
/in/foo.cc:35:9: warning: 'mj2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   v[mj2]=true;
   ~~~~~~^~~~~
/in/foo.cc:26:8: warning: 'mj' may be used uninitialized in this function [-Wmaybe-uninitialized]
   v[mj]=true;
   ~~~~~^~~~~