View Compilation Error

0_0_38000565_12988.cpp: In function 'int lca(int, int)':
0_0_38000565_12988.cpp:46:13: error: 'fir' was not declared in this scope
     int l = fir[u], r = fir[v];
             ^
0_0_38000565_12988.cpp:47:13: error: 'r' was not declared in this scope
     if (l > r) swap(l, r);
             ^
0_0_38000565_12988.cpp:48:19: error: 'r' was not declared in this scope
     int lg = __lg(r - l + 1);
                   ^