bzoj 2483: Pku2279 Mr. Young’s Picture Permutations — 钩子公式
2483: Pku2279 Mr. Young's Picture Permutations Time Limit: 1 Sec Memory Limit: 128 MB Description Mr. Young wish...
2483: Pku2279 Mr. Young's Picture Permutations Time Limit: 1 Sec Memory Limit: 128 MB Description Mr. Young wish...
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