View Compilation Error

0_0_20211224_26788.cpp:4:1: error: 'LL' does not name a type
 LL dfs(LL p,LL q,LL num,LL stop){
 ^
0_0_20211224_26788.cpp: In function 'int main()':
0_0_20211224_26788.cpp:22:37: error: 'dfs' was not declared in this scope
         printf("%I64d\n",dfs(p,q,0,0));
                                     ^