摘要：
1154 Vertex Coloring (25分) A proper vertex coloring is a labeling of the graph's vertices with colors such that no two vertices sharing the same edge 阅读全文
摘要：
1153 Decode Registration Card of PAT (25分) A registration card number of PAT consists of 4 parts: the 1st letter represents the test level, namely, T 阅读全文