View Compilation Error

0_0_39605621_24041.cpp:6:9: error: 'N' was not declared in this scope
    6 | int n,a[N],b[N];
      |         ^
0_0_39605621_24041.cpp:6:14: error: 'N' was not declared in this scope
    6 | int n,a[N],b[N];
      |              ^
0_0_39605621_24041.cpp: In function 'void solve()':
0_0_39605621_24041.cpp:11:9: error: 'i' was not declared in this scope
   11 |     pre(i,1,n) cin >> a[i],mp[a[i]] ++ ;
      |         ^
0_0_39605621_24041.cpp:11:5: error: 'pre' was not declared in this scope
   11 |     pre(i,1,n) cin >> a[i],mp[a[i]] ++ ;
      |     ^~~