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P5029 T'ill It's Over
> 一个序列 $d\{n\} = \{1\}$,有 $m$ 种操作,每种操作都有一个操作次数的最大限制,且可以分为 $4$ 类: 1. 将任意一个满足 $d_i = a$ 的 $d_i$ 改为 $b$; 2. 将任意一个满足 $d_i \in [a1, a2]$ 的 $d_i$ 改为 $b$; 3. ......
适定问题(Well-posed problem)与不适定问题(ill posed problem)
Well-posed problem & Ill-posed problem. 适定问题(Well-posed problem)是指满足下列三个要求的问题: a solution exists:解必须存在;the solution is unique:解必须唯一;the solution’s beh ......