CF177D1.Encrypting Messages
普及-
通过率:0%
时间限制:2.00s
内存限制:256MB
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题目描述
The Smart Beaver from ABBYY invented a new message encryption method and now wants to check its performance. Checking it manually is long and tiresome, so he decided to ask the ABBYY Cup contestants for help.
A message is a sequence of n integers _a_1, _a_2, ..., a__n. Encryption uses a key which is a sequence of m integers _b_1, _b_2, ..., b__m (m ≤ n). All numbers from the message and from the key belong to the interval from 0 to c - 1, inclusive, and all the calculations are performed modulo c.
Encryption is performed in n - m + 1 steps. On the first step we add to each number _a_1, _a_2, ..., a__m a corresponding number _b_1, _b_2, ..., b__m. On the second step we add to each number _a_2, _a_3, ..., a__m + 1 (changed on the previous step) a corresponding number _b_1, _b_2, ..., b__m. And so on: on step number i we add to each number a__i, a__i + 1, ..., a__i + m - 1 a corresponding number _b_1, _b_2, ..., b__m. The result of the encryption is the sequence _a_1, _a_2, ..., a__n after n - m + 1 steps.
Help the Beaver to write a program that will encrypt messages in the described manner.
ABBYY 公司的聪明海狸发明了一种新的消息加密方法,现在他想要检验该方法的性能。手动检验耗时且枯燥,因此他决定请 ABBYY 杯的参赛选手们帮忙。
一条消息是一个由 n 个整数组成的序列 a1,a2,…,an。加密过程使用一个密钥,该密钥是一个由 m 个整数组成的序列 b1,b2,…,bm(其中 m≤n)。消息中和密钥中的所有数字均属于区间 [0,c−1](含端点),所有运算均在模 c 意义下进行。
加密共进行 n−m+1 步。第一步中,将 a1,a2,…,am 分别加上对应的 b1,b2,…,bm;第二步中,将上一步已更新过的 a2,a3,…,am+1 分别加上对应的 b1,b2,…,bm;依此类推:在第 i 步中,将 ai,ai+1,…,ai+m−1 分别加上对应的 b1,b2,…,bm。经过全部 n−m+1 步后所得的序列 a1,a2,…,an 即为加密结果。
请帮助海狸编写一个程序,按上述方式对消息进行加密。
输入格式
The first input line contains three integers n, m and c, separated by single spaces.
The second input line contains n integers a__i (0 ≤ a__i < c), separated by single spaces — the original message.
The third input line contains m integers b__i (0 ≤ b__i < c), separated by single spaces — the encryption key.
The input limitations for getting 30 points are:
- 1 ≤ m ≤ n ≤ 103
- 1 ≤ c ≤ 103
The input limitations for getting 100 points are:
- 1 ≤ m ≤ n ≤ 105
- 1 ≤ c ≤ 103
第一行输入包含三个整数 n、m 和 c,以单个空格分隔。
第二行输入包含 n 个整数 ai(0 ≤ ai < c),以单个空格分隔——表示原始消息。
第三行输入包含 m 个整数 bi(0 ≤ bi < c),以单个空格分隔——表示加密密钥。
获得 30 分的输入限制为:
- 1 ≤ m ≤ n ≤ 103
- 1 ≤ c ≤ 103
获得 100 分的输入限制为:
- 1 ≤ m ≤ n ≤ 105
- 1 ≤ c ≤ 103
输出格式
Print n space-separated integers — the result of encrypting the original message.
输出 n 个空格分隔的整数——即原始消息加密后的结果。
输入输出样例
输入#1
4 3 2 1 1 1 1 1 1 1
输出#1
0 1 1 0
输入#2
3 1 5 1 2 3 4
输出#2
0 1 2
说明/提示
In the first sample the encryption is performed in two steps: after the first step a = (0, 0, 0, 1) (remember that the calculations are performed modulo 2), after the second step a = (0, 1, 1, 0), and that is the answer.
在第一个样例中,加密过程分为两步:第一步后,$ a = (0, 0, 0, 1) $(注意所有运算均在模 $ 2 $ 意义下进行),第二步后,$ a = (0, 1, 1, 0) $,即为答案。
输入解题思路,AI测评打分。不知道怎么写?