Submission #1288553

#TimeUsernameProblemLanguageResultExecution timeMemory
1288553WH8XORanges (eJOI19_xoranges)C++20
100 / 100
479 ms53340 KiB
#include <bits/stdc++.h>
using namespace std;
#define int long long 
#define pll pair<int, int>
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define endl '\n'
#define ld long double
#define sz(x) static_cast<int>((x).size())
#define i5 tuple<int,int,int,int,int>
int cdiv(int a, int b){return a/b + !!(a%b);}

struct node {
       int s, e, m, v;
       node *l, *r;
       node (int S, int E){
              s=S, e=E, m=(s+e)/2, v=0;
              if(s!=e){
                     l=new node(s, m);
                     r=new node(m+1, e);
              }
       }
       int combine(int a, int b){
              return a^b;
       }
       void upd(int S, int V){ // range add. 
              if(s==e){
                     v=V;
                     return;
              }
              if (S<=m) l->upd(S,V);
              else if (S>m) r->upd(S,V);
              v=combine(l->v,r->v);
       }
       int qry(int S,int E){
              if((S==s and E==e) or s==e){
                     return v;
              }
              if(E<=m)return l->qry(S,E);
              if(S>m)return r->qry(S,E);
              return combine(l->qry(S,m),r->qry(m+1,E));
       }
} *root[2];



signed main(){
	int n,m;cin>>n>>m;
	int a[n]; for(int i=0;i<n;i++)cin>>a[i];
	root[0]=new node(0, n);
	root[1]=new node(0, n);
	for(int i=0;i<n;i++){
		root[i%2]->upd(i, a[i]);
	}
	for(int qind=0;qind<m;qind++){
		int t,a,b;cin>>t>>a>>b;
		if(t==1){
			a--;
			root[a%2]->upd(a, b);
		}
		else {
			a--,b--;
			if((b-a+1)%2==0){
				cout<<0<<'\n';
			}
			else {
				cout<<root[a%2]->qry(a, b)<<'\n';
			}
		}
	}
}
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