Submission #265395

#	Time	Username	Problem	Language	Result	Execution time	Memory
265395		eagle30	XORanges (eJOI19_xoranges)	C++14	100 / 100	960 ms	8936 KiB

xoranges

#include<bits/stdc++.h>
using namespace std;
int arr[1000000], binary1[1000000], binary2[1000000];
int n, m;
void update1(int s, int k){
    for(int i=s; i<=n; i+=i&-i)
        binary1[i]=(binary1[i]^k);
}
int query1(int s){
    int ans=0;
    for(int i=s; i>=1; i-=i&-i)
        ans=(ans^binary1[i]);
    return ans;
}
void update2(int s, int k){
    for(int i=s; i<=n; i+=i&-i)
        binary2[i]=(binary2[i]^k);
}
int query2(int s){
    int ans=0;
    for(int i=s; i>=1; i-=i&-i)
        ans=(ans^binary2[i]);
    return ans;
}
int main(){
cin>>n>>m;
for(int i=1; i<=n; i++){
    cin>>arr[i];
    if(i%2==1)
        update1(i, arr[i]);
    else
        update2(i, arr[i]);
}
for(int i=0; i<m; i++){
    int hi;
    cin>>hi;
    if(hi==1){
        int a, b;
        cin>>a>>b;
        if(a%2==1){
            update1(a, (query1(a)^query1(a-1)));
            update1(a, b);
        }
        else{
            update2(a, (query2(a)^query2(a-1)));
            update2(a, b);
        }
    }
    else{
        int a, b;
        cin>>a>>b;
        if((a-b+1)%2==0)
            cout<<0<<'\n';
        else if(a%2==1)
            cout<<(query1(b)^query1(a-1))<<'\n';
        else
            cout<<(query2(b)^query2(a-1))<<'\n';
    }
}
return 0;
}

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