CF1109B Sasha and One More Name
CF1109B Sasha and One More Name
- 構造類題目.
仔細看樣例解釋能發現點東西? - 結論:答案只可能是 \(Impossible,1,2\) .
- \(Impossible:\) 有 \(n\) 個或 \(n-1\) 個相同的字母,顯然無法拼出另一個回文串.
(樣例3) - \(1:\) \(Cut\) \(1\) 次,相當於是做了原串的一個循環排列. \(O(n^2)\) 對所有循環排列驗證是否符合要求即可.
(樣例4) - \(2:\) 在原串中找出一段 \(len<n/2\) 的前綴以及與它等長的後綴,將它們 \(Cut\) 出後交換.若所有的前綴與對應交換後都不符合要求,則一定是 \(Impossible\)
(樣例1)
- \(Impossible:\) 有 \(n\) 個或 \(n-1\) 個相同的字母,顯然無法拼出另一個回文串.
- 只需判斷是否為前 \(2\) 種情況,時間復雜度為 \(O(n^2)\) .
代碼:咕了
CF1109B Sasha and One More Name
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