View Compilation Error

0_0_18257165_6809.cpp:6:14: error: 'llx' has not been declared
 ll dfs(int n,llx)
              ^
0_0_18257165_6809.cpp: In function 'll dfs(int, int)':
0_0_18257165_6809.cpp:8:14: error: 'x' was not declared in this scope
     if(n==0||x==0) return 0;
              ^
0_0_18257165_6809.cpp:11:8: error: 'x' was not declared in this scope
     if(x<=m) return dfs(n-1,x);
        ^