delete pics to save space

8.3261.cpp

@@ -0,0 +1,56 @@
+#include<cstdio>
+#include<iostream>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+const int maxn=600005;
+int n,m,ch[maxn*24][2],lst[maxn*24],s[maxn],rt[maxn],ncnt;
+void insert(int i,int k,int p,int &q)
+{
+	if(!q) q=++ncnt;
+	if(k<0) { lst[q]=i; return; }
+	int c=(s[i]>>k)&1;
+	if(p) ch[q][c^1]=ch[p][c^1];
+	insert(i,k-1,ch[p][c],ch[q][c]);
+	lst[q]=max(lst[ch[q][0]],lst[ch[q][1]]);
+}
+int query(int o,int val,int k,int L)
+{
+	if(k<0) return s[lst[o]]^val;
+	int c=val>>k&1;
+	if(lst[ch[o][c^1]]>=L) return query(ch[o][c^1],val,k-1,L);
+	else return query(ch[o][c],val,k-1,L);
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	ios::sync_with_stdio(false);
+	cin>>n>>m;
+	lst[0]=-1;
+	insert(0,23,0,rt[0]);
+	for(int i=1;i<=n;i++)
+	{
+		int x; cin>>x;
+		s[i]=s[i-1]^x;
+		insert(i,23,rt[i-1],rt[i]);
+	}
+	for(int i=1;i<=m;i++)
+	{
+		char op; cin>>op;
+		if(op=='A')
+		{
+			int x; cin>>x;
+			n++;
+			s[n]=s[n-1]^x;
+			insert(n,23,rt[n-1],rt[n]);
+		}
+		else
+		{
+			int l,r,x; cin>>l>>r>>x;
+			printf("%d\n",query(rt[r-1],x^s[n],23,l-1));
+		}
+	}
+	return 0;
+}