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DP TLE了~~用DP做的，TLE了~~ 我的做法是：每个R[i] 求出他的所有可能的组合（预处理先求完），假设总共有tot[i]个状态， best[i][j] 表示 R[i] 使用第 j 个状态的最优解。进行DP，还是TLE了~郁闷ing Followed by:
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