foo.cc: In function ‘int main()’:
foo.cc:7:34: warning: variable ‘ans1’ set but not used [-Wunused-but-set-variable]
    7 |         int a1[n1],a2[n2],a3[n3],ans1[max(n1,n2)],ans2[max(n1,n3)],an1=0,an2=0;
      |                                  ^~~~
foo.cc:7:51: warning: variable ‘ans2’ set but not used [-Wunused-but-set-variable]
    7 |         int a1[n1],a2[n2],a3[n3],ans1[max(n1,n2)],ans2[max(n1,n3)],an1=0,an2=0;
      |                                                   ^~~~