View Compilation Error

0_0_21614244_3892.cpp:10:1: error: 'LL' does not name a type
 LL dfs(int pos,int pre,int flag,bool lead,bool limit)
 ^
0_0_21614244_3892.cpp:27:1: error: 'LL' does not name a type
 LL solve(LL x)
 ^
0_0_21614244_3892.cpp: In function 'int main()':
0_0_21614244_3892.cpp:40:5: error: 'LL' was not declared in this scope
     LL ri;
     ^
0_0_21614244_3892.cpp:45:23: error: 'ri' was not declared in this scope
         scanf("%lld",&ri);
                       ^
0_0_21614244_3892.cpp:47:33: error: 'solve' was not declared in this scope
         printf("%lld\n",solve(ri));
                                 ^