Submission #448535

#	Time	Username	Problem	Language	Result	Execution time	Memory
448535		Tenis0206	XORanges (eJOI19_xoranges)	C++11	55 / 100	4 ms	600 KiB

xoranges

#include <bits/stdc++.h>

using namespace std;
struct arbore_de_intervale
{
    int par,imp;
};
arbore_de_intervale ai[200005];
int n,q,v[200005];
void update(int poz, int val, int nod, int a, int b)
{
    if(a==b)
    {
        if(a%2==1)
        {
            ai[nod].imp = val;
            ai[nod].par = 0;
        }
        else
        {
            ai[nod].par = val;
            ai[nod].imp = 0;
        }
        return;
    }
    int mij = (a+b)>>1;
    if(poz<=mij)
    {
        update(poz,val,nod*2,a,mij);
    }
    else
    {
        update(poz,val,nod*2+1,mij+1,b);
    }
    ai[nod].par = (ai[nod*2].par ^ ai[nod*2+1].par);
    ai[nod].imp = (ai[nod*2].imp ^ ai[nod*2+1].imp);
}
int query(int qa, int qb, int paritate, int nod, int a, int b)
{
    if(qa<=a && qb>=b)
    {
        if(paritate%2==0)
        {
            return ai[nod].par;
        }
        return ai[nod].imp;
    }
    int mij = (a+b)>>1;
    int rez1 = 0, rez2 = 0;
    if(qa<=mij)
    {
        rez1 = query(qa,qb,paritate,nod*2,a,mij);
    }
    if(qb>mij)
    {
        rez2 = query(qa,qb,paritate,nod*2+1,mij+1,b);
    }
    return (rez1 ^ rez2);
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin>>n>>q;
    for(int i=1; i<=n; i++)
    {
        cin>>v[i];
        update(i,v[i],1,1,n);
    }
    for(int i=1; i<=q; i++)
    {
        int t;
        cin>>t;
        if(t==1)
        {
            int poz,val;
            cin>>poz>>val;
            update(poz,val,1,1,n);
        }
        else
        {
            int x,y;
            cin>>x>>y;
            if((y-x+1)%2==0)
            {
                cout<<0<<'\n';
                continue;
            }
            if(x%2==1)
            {
                cout<<query(x,y,1,1,1,n)<<'\n';
            }
            else
            {
                cout<<query(x,y,0,1,1,n)<<'\n';
            }
        }
    }
    return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 25 / 25
• Subtask 4: 0 / 20
• Subtask 5: 0 / 25