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</html><description>Problem Description A city consists of several buildings, each with a unique number. There are directed roads between the buildings. The problem is to determine the construction order of these buildings based on specific rules that must be followed. The construction order of all buildings is determined by the given conditions. This problem can be &hellip; &#xB354; &#xBCF4;&#xAE30; ""</description></oembed>
