This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
vector <int> seg1(200000*3);
vector <int> seg2(200000*3);
vector <int> v(200000);
void build(int l,int r,int u){
if(l == r){
if(l % 2 == 1){
return;
}
seg1[u] = v[l];
return;
}
build(l,(l+r)/2,u*2);
build((l+r)/2+1,r,u*2+1);
seg1[u] = seg1[u*2]^seg1[u*2+1];
}
void update(int l,int r,int u,int v,int k){
if(l == r && l == v){
seg1[u] = k;
return;
}
if(v < l || v > r)return;
update(l,(l+r)/2,u*2,v,k);
update((l+r)/2+1,r,u*2+1,v,k);
seg1[u] = seg1[u*2]^seg1[u*2+1];
}
int find(int l,int r,int u,int a,int b,int res){
if(a <= l && b >= r){
return seg1[u]^res;
}
if(l > b || r < a){
return res;
}
res = find(l,(l+r)/2,u*2,a,b,res);
res = find((l+r)/2+1,r,u*2+1,a,b,res);
return res;
}
void build2(int l,int r,int u){
if(l == r){
if(l % 2 == 0){
return;
}
seg2[u] = v[l];
return;
}
build2(l,(l+r)/2,u*2);
build2((l+r)/2+1,r,u*2+1);
seg2[u] = seg2[u*2]^seg2[u*2+1];
}
void update2(int l,int r,int u,int v,int k){
if(l == r && l == v){
seg2[u] = k;
return;
}
if(v < l || v > r)return;
update2(l,(l+r)/2,u*2,v,k);
update2((l+r)/2+1,r,u*2+1,v,k);
seg2[u] = seg2[u*2]^seg2[u*2+1];
}
int find2(int l,int r,int u,int a,int b,int res){
if(a <= l && b >= r){
return seg2[u]^res;
}
if(l > b || r < a){
return res;
}
res = find2(l,(l+r)/2,u*2,a,b,res);
res = find2((l+r)/2+1,r,u*2+1,a,b,res);
return res;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(0);
int n,q;
cin >> n >> q;
for(int i = 0;i < n;i++){
cin >> v[i];
}
build(0,n-1,1);
build2(0,n-1,1);
while(q--){
/*
for(int i = 0;i < 20;i++){
cout << seg1[i] << " ";
}
cout << "\n";
for(int i = 0;i < 20;i++){
cout << seg2[i] << " ";
}
*/
//cout << "\n";
int x,l,r;
cin >> x >> l >> r;
if(x == 1){
l--;
if(l % 2 == 0){
update(0,n-1,1,l,r);
}else{
update2(0,n-1,1,l,r);
}
}else{
l--;
r--;
if((r-l) % 2 == 1){
cout << "0\n";
}else{
if(l%2 == 0){
cout << find(0,n-1,1,l,r,0) << "\n";
}else{
cout << find2(0,n-1,1,l,r,0) << "\n";
}
}
}
}
return 0;
}
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