HDU - 5014 Number Sequence - c++编程基础

Problem Description There is a special number sequence which has n+1 integers. For each number in sequence, we have two rules:

● a _i ∈ [0,n]
● a _i ≠ a _j( i ≠ j )

For sequence a and sequence b, the integrating degree t is defined as follows(“?” denotes exclusive or):

t = (a ₀ ? b ₀) + (a ₁ ? b ₁) +???+ (a _n ? b _n)

(sequence B should also satisfy the rules described above)

Now give you a number n and the sequence a. You should calculate the maximum integrating degree t and print the sequence b.

Input There are multiple test cases. Please process till EOF.

For each case, the first line contains an integer n(1 ≤ n ≤ 10 ⁵), The second line contains a ₀,a ₁,a ₂,...,a _n.

Output For each case, output two lines.The first line contains the maximum integrating degree t. The second line contains n+1 integers b ₀,b ₁,b ₂,...,b _n. There is exactly one space between b _i and b _i+1 (0 ≤ i ≤ n - 1). Don’t ouput any spaces after b _n.

Sample Input

4
2 0 1 4 3

Sample Output

20
1 0 2 3 4
题意：求[0, n]的两个排列两两异或和的最大值
思路：算的上是一道规律题吧，拿5：101来说，能异或到的最大的数是111，那么就有（101，10）和（100，11）这两种，那么我们依次推下去求解
就是比如：0，1，2，3，4，5对应的值是：1，0，5，4，3，2，可以比较容易看到规律
#include 
   
    
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      #include 
     
       #include 
      
        #include 
       
         typedef __int64 ll; //typedef long long ll; using namespace std; const int maxn = 100005; ll ans[maxn]; int n; int cal(int m) { int len = 0; while (m) { m >>= 1; len++; } return len; } ll init(int m) { ll sum = 0; while (m >= 0) { int len = cal(m); ll Max = (ll)(1<