AtCoder Regular Contest 092 D - Two Sequences

如题解：

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<string>
#include<algorithm>
#include<iostream>
#include<queue>
#include<map>
#include<cmath>
#include<set>
#include<stack>
#define ll long long
#define pb push_back
#define max(x,y) ((x)>(y)?(x):(y))
#define min(x,y) ((x)>(y)?(y):(x))
#define cls(name,x) memset(name,x,sizeof(name))
#define fs first
#define sc second
#define mp make_pair
#define L(x) (1<<x)
#define next Next
#define index Index
using namespace std;
const int inf=1e9+10;
const ll llinf=1e17+10;
const int maxn=2e5+10;
const int maxm=5e1+10;
const int maxk=29;
const int mod=1e9+7;
int n;
int A[maxn],B[maxn];
int num[maxm][maxn];
int solve(int temp[],int x)//返回数组中小于x的个数
{
    int pos=lower_bound(temp+1,temp+1+n,x)-temp;
    return pos-1;
}
int main()
{
    //freopen("in.txt","r",stdin);
    while(~scanf("%d",&n))
    {
        for(int i=1;i<=n;i++)
            scanf("%d",&A[i]);
        for(int i=1;i<=n;i++)
            scanf("%d",&B[i]);
        for(int i=0;i<=maxk;i++)
            for(int j=1;j<=n;j++)
            num[i][j]=B[j]%(L(i+1));
        for(int i=0;i<=maxk;i++)
            sort(num[i]+1,num[i]+1+n);
        int ans=0;
        for(int k=0;k<=maxk;k++)
        {
            ll c=0;
            for(int i=1;i<=n;i++)
            {
                int a=A[i]%(L(k+1));
                c+=solve(num[k],2*L(k)-a)-solve(num[k],L(k)-a);
                c+=solve(num[k],4*L(k)-a)-solve(num[k],3*L(k)-a);
            }
            if(c%2==1)
                ans+=L(k);
        }
        printf("%d\n",ans);
    }
    return 0;
}