Submission #275613

#	Time	Username	Problem	Language	Result	Execution time	Memory
275613		JuliusMieliauskas	XORanges (eJOI19_xoranges)	C++14	100 / 100	139 ms	5368 KiB

xoranges

#include <bits/stdc++.h>

using namespace std;

#define all(x) x.begin(), x.end()
#define vi vector<int>
#define vll vector<long long>
#define MOD 1000000007
#define endl '\n'

typedef long long ll;

void print(vi v){
    cout<<"Contents of vector:\n";
    for(auto x : v) cout<<x<<" ";
    cout<<endl<<endl;
}

const int MAXN = 200009;
int ar[MAXN];
int n;

int fenodd[MAXN] = {0};
int feneven[MAXN] = {0};

void updodd(int p, int x) {
    for (int i = p; i < MAXN; i += i&(-i))
        fenodd[i] ^= x;
}
int getodd(int p) {
    // gauna sumą elementų nuo 1-ojo iki p-tojo
    int ret = 0;
    for (int i = p; i > 0; i -= i&(-i))
        ret ^= fenodd[i];
    return ret;
}
int getodd (int l, int r) {
    // gauna sumą elementų, kurių indeksai intervale [l; r]
    //cout<<"Getting "<<r<<" and "<<l<<endl;
    return getodd(r) ^ getodd(l-1);
}

void updeven(int p, int x) {
    for (int i = p; i < MAXN; i += i&(-i))
        feneven[i] ^= x;
}
int geteven(int p) {
    int ret = 0;
    for (int i = p; i > 0; i -= i&(-i))
        ret ^= feneven[i];
    return ret;
}
int geteven(int l, int r) {
    //cout<<"R: "<<r<<" L: "<<l-1<<endl;
    return geteven(r) ^ geteven(l-1);
}

void solve(){
    int q; cin>>n>>q;
    for(int i = 0; i<n; i++) cin>>ar[i];
    //cerr<<"0 0 "<<endl;
    //updodd(0, 0);
    //cerr<<"10101"<<endl;
    //updeven(0, 0);
    updodd(1, ar[0]);
    updeven(1, ar[1]);

    for(int i = 4; i<=n; i+=2) {
        updeven((i+1)/2, ar[i-1]);
    }

    for(int i = 3; i<=n; i+=2) {
        //cout<<"Updating "<<i<<endl;
        updodd((i+1)/2, ar[i-1]);
    }

    /*cout<<"Prefsodd: "<<endl;
    for(int i = 0; i<=n; i++) cout<<getodd(i)<<" ";
    cout<<endl<<endl;*/

    /*cout<<"Prefseven: "<<endl;
    for(int i = 0; i<=n; i++) cout<<geteven(i)<<" ";
    cout<<endl<<endl;*/

    for(int i = 0; i<q; i++){
        int type; cin>>type;
        if(type == 1){
            int ind, value; cin>>ind>>value;

            //cout<<"Updating "<<(ind+1)/2<<endl;
            if(ind%2) {
                updodd((ind+1)/2, getodd((ind+1)/2, (ind+1)/2));
                updodd((ind+1)/2, value);
            } else {
                updeven((ind+1)/2, geteven((ind+1)/2, (ind+1)/2));
                updeven((ind+1)/2, value);
            }

            /*cout<<"Prefsodd: "<<endl;
            for(int i = 0; i<=n; i++) cout<<getodd(i)<<" ";
            cout<<endl<<endl;*/

        } else {
            int from, to; cin>>from>>to;

            if((to-from+1)%2 == 0){
                cout<<"0"<<endl;
                continue;
            }

            if(from%2) {
                cout<<getodd(max(1, (from+1)/2), (to+1)/2)<<endl;
            } else {
                cout<<geteven(max(1, (from+1)/2), (to+1)/2)<<endl;
            }
        }
    }
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    //ifstream cin("input.txt"); ofstream cout("output.txt");///cia failai

    //int T; cin>>T;
    int T = 1;

    for(int it = 1; it<=T; it++){
        solve();

    }
}

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