https://www.acwing.com/problem/content/258/
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 600010;
int trie[N * 24][2], latest[N * 24];
int s[N], root[N], n, m, tot;
void Insert(int i, int k, int p, int q) {
if(k < 0) {
latest[q] = i;
return;
}
int c = s[i] >> k & 1;
if(p)
trie[q][c ^ 1] = trie[p][c ^ 1];
trie[q][c] = ++tot;
Insert(i, k - 1, trie[p][c], trie[q][c]);
latest[q] = max(latest[trie[q][0]], latest[trie[q][1]]);
}
int Query(int now, int val, int k, int limit) {
if(k < 0)
return s[latest[now]] ^ val;
int c = val >> k & 1;
if(latest[trie[now][c ^ 1]] >= limit)
return Query(trie[now][c ^ 1], val, k - 1, limit);
else
return Query(trie[now][c], val, k - 1, limit);
}
int main() {
#ifdef Yinku
freopen("Yinku.in", "r", stdin);
#endif // Yinku
int n, m;
scanf("%d%d", &n, &m);
latest[0] = -1;
root[0] = ++tot;
Insert(0, 23, 0, root[0]);
for(int i = 1; i <= n; ++i) {
int x;
scanf("%d", &x);
s[i] = s[i - 1] ^ x;
root[i] = ++tot;
Insert(i, 23, root[i - 1], root[i]);
}
for(int i = 1; i <= m; ++i) {
char op[2];
scanf("%s", op);
if(op[0] == 'A') {
int x;
scanf("%d", &x);
root[++n] = ++tot;
s[n] = s[n - 1] ^ x;
Insert(n, 23, root[n - 1], root[n]);
} else {
int l, r, x;
scanf("%d%d%d", &l, &r, &x);
printf("%d
", Query(root[r - 1], x ^ s[n], 23, l - 1));
}
}
return 0;
}