④处应填()
A[i * b + j - 1] == A[i * b + j]->son[0]
A[i * b + j]->val < A[i * b + j - 1]->val
A[i * b + j] == A[i * b + j - 1]->son[1]
A[i * b + j]->dep < A[i * b + j - 1]->dep
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