标题描写
At Bessie"s recent birthday party, she received N (2 <= N <= 100,000; N%2 == 0) pearls, each painted one of C different colors (1 <= C <= N).At Bessie"s recent birthday party, she re
阅读背景：
P2902[USACO08MAR]珍珠配对PearlPairing
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