题解

#include<bits/stdc++.h>
#define int long long
using namespace std;
int n,q,a[200005],s[200005],l,r;
signed main(){
    cin>>n>>q;
    for(int i=1;i<=n;i++)
        cin>>a[i],s[i]=s[i-1]^a[i];
    while(q--){
        cin>>l>>r;
        cout<<(s[r]^s[l-1])<<'\n';
    }
    return 0;
}