Submission #455330

#	Time	Username	Problem	Language	Result	Execution time	Memory
455330		kkk	XORanges (eJOI19_xoranges)	C++14	100 / 100	183 ms	20232 KiB

xoranges

#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
long long a[1000003],tree[4000000][3];
void build_tree(long long l,long long r,long long ind)
{
    if(l==r)
    {
        if(l%2==0)tree[ind][0]=a[l];
        else tree[ind][1]=a[l];
        return;
    }
    long long mid=(l+r)/2;

    build_tree(l,mid,2*ind);
    build_tree(mid+1,r,2*ind+1);

    tree[ind][0]=(tree[2*ind][0]^tree[2*ind+1][0]);
    tree[ind][1]=(tree[2*ind][1]^tree[2*ind+1][1]);
}
void update(long long l,long long r,long long pos,long long val,long long ind)
{
    if(pos>r || pos<l)return;

    if(l==r)
    {
        if(l%2==0)tree[ind][0]=val;
        else tree[ind][1]=val;
        return;
    }
    long long mid=(l+r)/2;

    update(l,mid,pos,val,2*ind);
    update(mid+1,r,pos,val,2*ind+1);

    tree[ind][0]=(tree[2*ind][0]^tree[2*ind+1][0]);
    tree[ind][1]=(tree[2*ind][1]^tree[2*ind+1][1]);

}
long long query(long long le,long long ri,long long l,long long r,long long ind,int t)
{
    if(le>r || ri<l)return 0;

    if(l<=le && ri<=r)
    {
        if(t==0)return tree[ind][0];
        else return tree[ind][1];
    }
    long long mid=(le+ri)/2, t2;

    return (query(le,mid,l,r,2*ind,t)^query(mid+1,ri,l,r,2*ind+1,t));
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    long long n,m,q,j,i,b,ans=0,t,l,r;


    cin>>n>>q;
    for(i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    build_tree(1,n,1);
    for(i=0;i<q;i++)
    {
        cin>>t;
        if(t==1)
        {
            cin>>l>>r;
            update(1,n,l,r,1);
        }
        else
        {
            cin>>l>>r;
            if((r-l+1)%2==0)
            {
                cout<<0<<endl;
                continue;
            }

            cout<<query(1,n,l,r,1,l%2)<<endl;
        }

    }


}

Compilation message (stderr)

xoranges.cpp: In function 'long long int query(long long int, long long int, long long int, long long int, long long int, int)':
xoranges.cpp:49:30: warning: unused variable 't2' [-Wunused-variable]
   49 |     long long mid=(le+ri)/2, t2;
      |                              ^~
xoranges.cpp: In function 'int main()':
xoranges.cpp:59:17: warning: unused variable 'm' [-Wunused-variable]
   59 |     long long n,m,q,j,i,b,ans=0,t,l,r;
      |                 ^
xoranges.cpp:59:21: warning: unused variable 'j' [-Wunused-variable]
   59 |     long long n,m,q,j,i,b,ans=0,t,l,r;
      |                     ^
xoranges.cpp:59:25: warning: unused variable 'b' [-Wunused-variable]
   59 |     long long n,m,q,j,i,b,ans=0,t,l,r;
      |                         ^
xoranges.cpp:59:27: warning: unused variable 'ans' [-Wunused-variable]
   59 |     long long n,m,q,j,i,b,ans=0,t,l,r;
      |                           ^~~

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