【链接】 我是链接,点我呀:)

【题意】

你可以把c[i]改成c[i+1]+c[i-1]-c[i]
(2

【题解】

```cpp
d[i] = c[i+1]-c[i]; (1change c[i]

c[i]' = c[i+1]+c[i-1]-c[i];

d[i-1] = c[i]'-c[i-1];
= c[i+1]+c[i-1]-c[i]-c[i-1] == c[i+1]-c[i] = d[i];

d[i] = c[i+1]-c[i]'
= c[i+1]-c[i+1]-c[i-1]+c[i]
= c[i] - c[i-1];
= d[i-1];
也就是说对2..n-1进行操作的话
就是把相邻的d的值交换一下
显然这样的交换能让d变成任意顺序
因此,只要c[1]==d[1]并且c[n]==d[n]
然后排序后的c和排序后的d相同的话,就ok.

这里必须要用Integer的equals方法比较才不会超时。。

直接用int的a[i]!=b[i]会超时>_<

</font>

<font color = black size = 6> 【代码】</font>
```cpp
import java.io.*;
import java.util.*; //code start from here
/*
d[i] = c[i+1]-c[i]; (1<=i<=n-1) change c[i] c[i]' = c[i+1]+c[i-1]-c[i]; d[i-1] = c[i]'-c[i-1];
= c[i+1]+c[i-1]-c[i]-c[i-1] == c[i+1]-c[i] = d[i]; d[i] = c[i+1]-c[i]'
= c[i+1]-c[i+1]-c[i-1]+c[i]
= c[i] - c[i-1];
= d[i-1];
*/ public class Main { final static int N = (int)1e5;
static InputReader in;
static PrintWriter out;
static int n;
static Integer c[],t[],d1[],d2[]; public static void main(String[] args) throws IOException{
in = new InputReader();
//out = new PrintWriter(System.out);
c = new Integer[N+10];t = new Integer[N+10];
d1 = new Integer[N+10]; d2 = new Integer[N+10]; n = in.nextInt();
for (int i = 1;i <= n;i++) c[i] = in.nextInt();
for (int i = 1;i <= n;i++) t[i] = in.nextInt();
if (!c[1].equals(t[1]) || !c[n].equals(t[n])){
System.out.println("No");
return;
}
for (int i = 1;i <= n-1;i++) d1[i] = c[i+1]-c[i];
for (int i = 1;i <= n-1;i++) d2[i] = t[i+1]-t[i];
Arrays.sort(d1, 1,n);
Arrays.sort(d2, 1,n);
for (int i = 1;i <= n-1;i++)
if (!d1[i].equals(d2[i])) {
System.out.println("No");
return;
}
System.out.println("Yes");
} static class InputReader{
public BufferedReader br;
public StringTokenizer tokenizer; public InputReader() {
br = new BufferedReader(new InputStreamReader(System.in),32768);
tokenizer = null;
} public String next(){
while (tokenizer==null || !tokenizer.hasMoreTokens()) {
try {
tokenizer = new StringTokenizer(br.readLine());
}catch(IOException e) {
throw new RuntimeException(e);
}
}
return tokenizer.nextToken();
} public int nextInt() {
return Integer.parseInt(next());
}
}
}
05-19 07:10