本文主要是介绍2015多校-MZL's xor,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
Problem Description
MZL loves xor very much.Now he gets an array A.The length of A is n.He wants to know the xor of all (Ai+Aj)(1≤i,j≤n) The xor of an array B is defined as B1 xor B2...xor Bn
Input
Multiple test cases, the first line contains an integer T(no more than 20), indicating the number of cases. Each test case contains four integers:n,m,z,lA1=0,Ai=(Ai−1∗m+z) mod l1≤m,z,l≤5∗105,n=5∗105
Output
For every test.print the answer.
Sample Input
2 3 5 5 7 6 8 8 9
Sample Output
14 16
利用公式,把那些数找出来,注意i不一定小于j,那么会出现 5 2, 2 5,这种情况,异或后会变成0,那么最后的结果就是,对0 5 2,异或,最后乘于2,就是最终结果
#include <iostream>
#include <cstdio>using namespace std;long long a[600010];int main()
{int n,m,z,l,t;scanf("%d",&t);while(t--){scanf("%d%d%d%d",&n,&m,&z,&l);a[1]=0;for(int i=2; i<=n; i++){a[i]=(a[i-1]*m+z)%l;}long long ans=a[1]+a[1];for(int i=2;i<=n;i++)ans^=(a[i]);printf("%lld\n",ans*2);}return 0;
}
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