Submission #929333

#	Time	Username	Problem	Language	Result	Execution time	Memory
929333		hngr	XORanges (eJOI19_xoranges)	C++14	100 / 100	471 ms	16208 KiB

xoranges

//UDUUUU SHAAGD LLR CN INGEL DAWCIH YMN DEER SONIN PSDA WE;
#include <iostream>
#include <vector>
#include <set>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <string>
#define int long long 
using namespace std;
const int N = 2e5+7;
int a[N];
int st1[4*N];
int st2[4*N];
void Build(int node, int l, int r){
    if(l>r)return;
    if(l == r){
        if(l&1){
            st2[node] = a[l];
        }
        else{
            st1[node] = a[l];
        }
        return;
    }
    int mid = (l+r)/2;
    Build(2*node+1, l, mid);
    Build(2*node+2, mid+1, r);
    st1[node] = st1[2*node+1] ^ st1[2*node+2];
    st2[node] = st2[2*node+1] ^ st2[2*node+2];
}
void Update(int node, int l, int r, int ind, int val){
    if(l>r || l>ind || r<ind) return;
    if(l == r){
        if(l&1){
            st2[node] = val;
        }
        else st1[node] = val;
        return;
    }
    else{
        int mid = (l+r)/2;
        Update(2*node+1, l, mid, ind, val);
        Update(2*node+2, mid+1, r, ind, val);
    }
    st2[node] = st2[2*node+1] ^ st2[2*node+2];
    st1[node] = st1[2*node+1] ^ st1[2*node+2];
}
 
int qry1(int node, int l, int r, int L, int R){
    if(l>R || r<L || l>r){
        return 0;
    }
    else if(l>=L && r<=R){
        return st1[node];
    }
    else{
        int mid = (l+r)/2;
        return qry1(2*node+1, l, mid, L, R)^qry1(2*node+2, mid+1, r, L, R);
    }
}
int qry2(int node, int l, int r, int L, int R){
    if(l>R || r<L || l>r){
        return 0;
    }
    else if(l>=L && r<=R){
        return st2[node];
    }
    else{
        int mid = (l+r)/2;
        return qry2(2*node+1, l, mid, L, R)^qry2(2*node+2, mid+1, r, L, R);
    }
}
 
int32_t main(){
    int n, q;
    cin >> n >> q;
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }
    Build(0, 0, n-1);
    while(q--){
        int t;
        cin >> t;
        if(t==1){
            int a, b;
            cin >> a >> b;
            a--;
            Update(0, 0, n-1, a, b);
        }
        else{
            int l, r;
            cin >> l >> r;
            r--; l--;
            int len=r-l+1;
            if(len&1){
                if(l&1){
                    cout << qry2(0, 0, n-1, l, r) << '\n';
                }
                else {
                    cout << qry1(0, 0, n-1, l, r) << '\n';
                }
            }
            else{
                cout << 0 << '\n';
            }
        }
    }
}
 

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 25 / 25
• Subtask 4: 20 / 20
• Subtask 5: 25 / 25