/in/foo.cc: In function 'int main()':
/in/foo.cc:6:13: warning: 'a' is used uninitialized [-Wuninitialized]
    6 |         maxa=a;
      |         ~~~~^~
/in/foo.cc:5:15: note: 'a' declared here
    5 |         int n,a,maxa=0;
      |               ^