View Compilation Error

0_0_17865645_23260.cpp: In function 'int dfs(int, int)':
0_0_17865645_23260.cpp:36:3: error: 'cnt' was not declared in this scope
   cnt += dfs(y, x);
   ^
0_0_17865645_23260.cpp:41:17: error: 'cnt' was not declared in this scope
  if (leaf[x] || cnt & 1) {
                 ^