View Compilation Error

0_0_21648495_6209.cpp: In function 'void dfs(int, int)':
0_0_21648495_6209.cpp:31:16: error: 'L' was not declared in this scope
     if(u == f) L[u] = p[u];
                ^
0_0_21648495_6209.cpp:32:10: error: 'L' was not declared in this scope
     else L[u] = L[f];
          ^
0_0_21648495_6209.cpp: In function 'int main()':
0_0_21648495_6209.cpp:161:71: error: 'L' was not declared in this scope
                 printf("%.3lf\n", log(y) + log(2) * (FindMax(1, 1, n, L[L[x]], R[L[x]]) - Find(1, 1, n, p[x])));
                                                                       ^