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crossingriver
- Input The first line of the input contains a single integer T (1 <= T <= 20), the number of test cases. Then T cases follow. The first line of each case contains N, and the second line contains N integers giving the time for each people to cr
yufafenxiqi
- 计算FIRST及FOLLOW集,生成ll(1)分析表
ll1
- 计算first follow集,预测分析表