/in/foo.cc: In function 'int main()':
/in/foo.cc:9:14: error: redeclaration of 'long long int a [(((ssizetype)n) + 1)]'
     int a[n+1];
              ^
/in/foo.cc:8:9: note: 'long long int a [(((ssizetype)n) + 1)]' previously declared here
     int a[n+1];
         ^
/in/foo.cc:12:6: error: 'b' was not declared in this scope
      b[i]=a[i];
      ^
/in/foo.cc:19:22: error: 'b' was not declared in this scope
             if(a[i]==b[i]){
                      ^