View Compilation Error

0_0_36000856_6182.cpp:4:1: error: 'll' does not name a type
 ll f[N][2],a[N];
 ^
0_0_36000856_6182.cpp:5:1: error: 'll' does not name a type
 ll dfs(int pos,bool limit,bool last)
 ^
0_0_36000856_6182.cpp: In function 'int solve(int)':
0_0_36000856_6182.cpp:24:3: error: 'a' was not declared in this scope
   a[len++]=n%10;
   ^
0_0_36000856_6182.cpp:27:22: error: 'dfs' was not declared in this scope
  return dfs(len-1,1,0);
                      ^
0_0_36000856_6182.cpp: In function 'int main()':
0_0_36000856_6182.cpp:31:2: error: 'll' was not declared in this scope
  ll m,t,n;
  ^
0_0_36000856_6182.cpp:32:7: error: 't' was not declared in this scope
  cin>>t;
       ^
0_0_36000856_6182.cpp:35:8: error: 'n' was not declared in this scope
   cin>>n;
        ^
0_0_36000856_6182.cpp:36:3: error: 'm' was not declared in this scope
   m=solve(n);
   ^