View Compilation Error

0_0_39634939_7745.cpp: In function 'void init()':
0_0_39634939_7745.cpp:23:9: error: 'vail' was not declared in this scope
   23 |         vail[i] = 0;
      |         ^~~~
0_0_39634939_7745.cpp: In function 'void solve()':
0_0_39634939_7745.cpp:60:17: error: 'vail' was not declared in this scope
   60 |                 vail[++cnt] = x;
      |                 ^~~~
0_0_39634939_7745.cpp:65:17: error: 'vail' was not declared in this scope
   65 |                 vail[++cnt] = y;
      |                 ^~~~
0_0_39634939_7745.cpp:72:38: error: 'vail' was not declared in this scope
   72 |             maxx = max(maxx, sz[find(vail[i])]);
      |                                      ^~~~
0_0_39634939_7745.cpp:77:16: error: 'vail' was not declared in this scope
   77 |             fa[vail[i]] = vail[i];
      |                ^~~~