Submission #930157

#	Time	Username	Problem	Language	Result	Execution time	Memory
930157		AmrT	XORanges (eJOI19_xoranges)	C++14	38 / 100	307 ms	8964 KiB

xoranges

#include <bits/stdc++.h>
#define lop(i,a,b) for(ll i = a; i < b; i++)
#define alop(i,v) for(auto &i: v)
#define in(v) for(auto &i: v) cin >> i;
#define ll long long
//#define endl "\n"
#define pb push_back
#define all(v) v.begin(),v.end()
#define mem(dp, x) memset(dp, x, sizeof(dp))
using namespace std;
const ll mod = 1e9 + 7;
    
    
int main(){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    ll n, q; cin >> n >> q;
    ll arr[n]; in(arr);
    ll pre0[n] = {}, pre1[n] = {};
    pre0[0] = pre0[1] = arr[0], pre1[1] = arr[1];
    for(int i = 2; i < n; i++){
        if(i % 2 == 0) 
            pre0[i] ^= arr[i];
        else 
            pre1[i] ^= arr[i];
        pre0[i] ^= pre0[i - 1];
        pre1[i] ^= pre1[i - 1];
    }
    
    while(q--){
        ll t, l, r; cin >> t >> l >> r;
        l--, r--;
    
        ll len = r - l + 1;
        if(len == 1)
            cout << arr[l]; 
        else if(len % 2 == 0)
            cout << 0;
        else{
            if(l % 2 == 1)
                cout << (pre1[r] ^ (l ? pre1[l - 1] : 0));
            else
                cout << (pre0[r] ^ (l ? pre0[l - 1] : 0));
        }
        cout << endl;
    }
    
    return 0;
}

• Subtask 1: 0 / 12
• Subtask 2: 18 / 18
• Subtask 3: 0 / 25
• Subtask 4: 20 / 20
• Subtask 5: 0 / 25