Equal (0): Everything in this space must be equal to 0. The answer is 0-0, placed horizontally; 3-0, placed vertically.
int i = 0, j = 0, k = left; // i:左数组指针, j:右数组指针, k:原数组指针，详情可参考Line官方版本下载
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Final Hurdle hintPopular.