If an area does not have any color coding, it means there are no conditions on the portions of dominoes within those spaces.
В России допустили «второй Чернобыль» в Иране22:31
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PrincetonEngineers
发展的“时间表”上，肇兴村同全国12.8万个脱贫村一道，启新程、促振兴。
int pivotIdx = partition(arr, low, high); // 分区并获取pivot位置