Submission #469506

#	Time	Username	Problem	Language	Result	Execution time	Memory
469506		FatihSolak	XORanges (eJOI19_xoranges)	C++17	100 / 100	217 ms	11888 KiB

xoranges

#include <bits/stdc++.h>
#define N 200005
#define int long long
using namespace std;
int t[4*N][2];
int arr[N];
void upd(int v,int tl,int tr,int pos,int val){
    if(tl == tr){
        t[v][pos%2] = val;
    }
    else{
        int tm = (tl+tr)/2;
        if(pos <= tm)
            upd(v*2,tl,tm,pos,val);
        else upd(v*2+1,tm+1,tr,pos,val);
        t[v][0] = t[v*2][0] ^ t[v*2+1][0];
        t[v][1] = t[v*2][1] ^ t[v*2+1][1];
    }
}
int get(int v,int tl,int tr,int l,int r,int idx){
    if(tr < l || r <tl){
        return 0;
    }
    if(l <= tl && tr <= r){
        return t[v][idx];
    }
    int tm = (tl+tr)/2;
    return get(v*2,tl,tm,l,r,idx)^get(v*2+1,tm+1,tr,l,r,idx);
}
void solve(){
    int n,q;
    cin >> n >> q;
    for(int i=1;i<=n;i++){
        cin >> arr[i];
        upd(1,1,n,i,arr[i]);
    }
    while(q--){
        int type;
        cin >> type;
        if(type == 1){
            int pos,val;
            cin >> pos >> val;
            upd(1,1,n,pos,val);
        }
        if(type == 2){
            int l,r;
            cin >> l >> r;
            if((r-l)%2){
                cout << 0 << "\n";
                continue;
            }
            cout << get(1,1,n,l,r,l%2) << "\n";
        }
    }
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    #ifdef Local
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
    #endif
    int t=1;
    //cin>>t;
    while(t--){
        solve();
    }
    #ifdef Local
    cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds ";
    #endif
}

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