answer.code:3: warning: "ONLINE_JUDGE" redefined
    3 | #define ONLINE_JUDGE
      | 
<command-line>: note: this is the location of the previous definition
answer.code:5:21: warning: left shift count >= width of type [-Wshift-count-overflow]
    5 | const int MAXN = (1 << 50) + 10;
      |                   ~~^~~~~
answer.code:7:6: error: size of array ‘a’ is not an integral constant-expression
    7 | ll a[MAXN];
      |      ^~~~
answer.code:9:6: error: size of array ‘f’ is not an integral constant-expression
    9 | ll f[MAXN];
      |      ^~~~