store my length in the object. This doesn't exist:
// 3. 要求稳定排序: 归并排序
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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
When shoes slide across a floor, wave-like deformations of the sole can generate squeaking. The pitch of the squeak depends on the rate at which deformations are generated.