CSES – Range Xor Queries

#include<bits/stdc++.h>
#define int long long
#define pii pair<int,int>
#define f first
#define s second
#define fastio ios_base::sync_with_stdio(0);cin.tie(0)
using namespace std;
//declare
int n,q;
vector<int> pre;
//
signed main(){
    fastio;
    cin>>n>>q;
    pre.push_back(0);
    for(int i=0;i<n;i++){
        int x; cin>>x;
        pre.push_back(pre.back() ^ x);
    }
    while(q--){
        int a,b; cin>>a>>b;
        cout<<(pre[b] ^ pre[a-1])<<"\n";
    }
    return 0;
}