/in/foo.cc: In function 'int main()':
/in/foo.cc:7:17: warning: format '%d' expects a matching 'int*' argument [-Wformat=]
  scanf("%d%d",&n);
                 ^
/in/foo.cc:21:19: error: lvalue required as left operand of assignment
   if(a[i]==0&&zxc=1)
                   ^