Description Vasiliy is fond of solving different tasks. Today he found one he wasn't able to sol ...
鏈接 http: codeforces.com group EzrFFyOc contest problem C 題意: 他希望它們按詞典順序排序 就像字典中那樣 ,但他不允許交換其中的任何一個。 唯一允許他做的操作是將其中的任何一個反轉 第一個字符變成最后一個, 第二個字符變成最后一個,以此類推 。 思路 DP,不斷更新花費的值,並且判斷是否可以滿足字典序排序。 dp i 表示,表示排到第i 個 ...
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Description Vasiliy is fond of solving different tasks. Today he found one he wasn't able to sol ...
CF1153F Serval and Bonus Problem 官方的解法是\(O(n ^ 2)\)的,這里給出一個\(O(n \log n)\)的做法。 首先對於長度為\(l\)的線段,顯然它的答案就是長度為\(1\)的線段的答案\(\times l\),這樣做只是為了方便計算。 考慮 ...
The library you create when you are done with Learn C The Hard Way http://c.learncodethehardway.org/ https://github.com/zedshaw/liblcthw ...
題意 一個長為 \(l\) 的線段,每次等概率選擇線段上兩個點,共選出 \(n\) 條線段,求至少被 \(k\) 條線段覆蓋的長度期望。 數據范圍 \(1 \le k \le n \le 200 ...
Vasya is preparing a contest, and now he has written a statement for an easy problem. The statement is a string of length n">n consisting ...
C. Bank Hacking time limit per test 2 seconds ...
C. Watto and Mechanism time limit per test 3 seconds memory limit per test 256 megabytes input ...