Submission #1245280

#	Time	Username	Problem	Language	Result	Execution time	Memory
1245280		boyan2010	XORanges (eJOI19_xoranges)	C++20	100 / 100	55 ms	3244 KiB

xoranges

#include<bits/stdc++.h>
#define MAXN 1000007
using namespace std;
int n,q,a[MAXN],b[MAXN],t,x,y;
int ft1[MAXN],ft2[MAXN];
int ls(int x)
{
    return ((x)&(-x));
}
void update1(int x,int val)
{
    for(int i=x;i<=MAXN;i+=ls(i))
    {
        ft1[i]^=val;
    }
}
void update2(int x,int val)
{
    for(int i=x;i<=MAXN;i+=ls(i))
    {
        ft2[i]^=val;
    }
}
int s1(int x)
{
    int ans=0;
    for(int i=x;i>0;i-=ls(i))
    {
        ans^=ft1[i];
    }
    return ans;
}
int s2(int x)
{
    int ans=0;
    for(int i=x;i>0;i-=ls(i))
    {
        ans^=ft2[i];
    }
    return ans;
}
int sum1(int l,int r)
{
    return (s1(r)^s1(l-1));
}
int sum2(int l,int r)
{
    return (s2(r)^s2(l-1));
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n>>q;
    for(int i=1;i<=n;i++)
    {
        if(i%2)
        {
            cin>>a[(i+1)/2];
            update1((i+1)/2,a[(i+1)/2]);
        }
        else
        {
            cin>>b[i/2];
            update2(i/2,b[i/2]);
        }
    }
    for(int i=0;i<q;i++)
    {
        cin>>t>>x>>y;
        if(t==2)
        {
            if((y-x+1)%2==0)
            {
                cout<<0<<"\n";
            }
            else
            {
                if(x%2)
                {
                    cout<<sum1((x+1)/2,(y+1)/2)<<"\n";
                }
                else
                {
                    cout<<sum2(x/2,y/2)<<"\n";
                }
            }
        }
        else
        {
            if(x%2)
            {
                update1((x+1)/2,(a[(x+1)/2]^y));
                a[(x+1)/2]=y;
            }
            else
            {
                update2(x/2,(b[x/2]^y));
                b[x/2]=y;
            }
        }
    }
    return 0;
}

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