Xor Sum HDU

#include <iostream>
#include <cstdio>
#include <sstream>
#include <cstring>
#include <map>
#include <set>
#include <vector>
#include <stack>
#include <queue>
#include <algorithm>
#include <cmath>
#define rap(i, a, n) for(int i=a; i<=n; i++)
#define rep(i, a, n) for(int i=a; i<n; i++)
#define lap(i, a, n) for(int i=n; i>=a; i--)
#define lep(i, a, n) for(int i=n; i>a; i--)
#define MOD 2018
#define LL long long
#define ULL unsigned long long
#define Pair pair<int, int>
#define mem(a, b) memset(a, b, sizeof(a))
#define _  ios_base::sync_with_stdio(0),cin.tie(0)
//freopen("1.txt", "r", stdin);
using namespace std;
const int maxn = 100000 + 5, INF = 0x7fffffff;
LL trie[32 * maxn][2], value[32 * maxn];
int rt, tot;

void build(LL s)
{
    rt = 0;
    for(int i=32; i>=0; i--)
    {
        int x = (s >> i) & 1; //  取每一位
        if(trie[rt][x] == 0)
        {
            trie[rt][x] = ++tot;
        }
        rt = trie[rt][x];
    }
    value[rt] = s;      //最后的结点记录s
}

LL qp(LL s)
{
    rt = 0;
    for(int i=32; i>=0; i--)
    {
        int x = (s >> i) & 1;
        if(trie[rt][x^1]) rt = trie[rt][x^1];
        else rt = trie[rt][x];
    }
    return value[rt];
}

void init()
{
    tot = 0;
    mem(trie, 0);
    mem(value, 0);
}


int main()
{
    int T, kase = 0;
    scanf("%d", &T);
    while(T--)
    {
        init();
        int n, m;
        scanf("%d%d", &n, &m);
        rap(i, 1, n)
        {
            LL temp;
            scanf("%lld", &temp);
            build(temp);
        }
        printf("Case #%d:
", ++kase);
        rap(i, 1, m)
        {
            LL temp;
            scanf("%lld", &temp);
            printf("%lld
", qp(temp));
        }


    }
    return 0;

}