251. Flatten 2D Vector
題目： Implement an iterator to flatten a 2d vector. For example,Given 2d vector = By calling next repeatedly until hasNext returns false ...
原文：[LeetCode] Flatten 2D Vector
Problem Description: Implement an iterator to flatten a d vector. For example,Given d vector By callingnextrepeatedly untilhasNextreturns false, the order of elements returned bynextshould be: , , , , ...
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