View Compilation Error

0_0_14587450_13772.cpp: In function 'long long int dfs(int, int, bool)':
0_0_14587450_13772.cpp:25:27: error: 'first' was not declared in this scope
         ret += dfs(i - 1, first && j == 0 ? 0 : nst[j][state],
                           ^
0_0_14587450_13772.cpp: In function 'long long int solve(long long int)':
0_0_14587450_13772.cpp:37:28: error: too many arguments to function 'long long int dfs(int, int, bool)'
     return dfs(len, 0, 1, 1);
                            ^
0_0_14587450_13772.cpp:19:4: note: declared here
 LL dfs(int i, int state, bool e) {
    ^