Submission #637391

#	Time	Username	Problem	Language	Result	Execution time	Memory
637391		ulianamalanyak	XORanges (eJOI19_xoranges)	C++14	55 / 100	1077 ms	4212 KiB

xoranges

#include <bits/stdc++.h>

using namespace std;

#define endl "\n"
#define INF 1e16
#define fi first
#define se second
#define pb push_back
#define in insert
#define speedup ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;

//--------------------------------|
const int DIM=2e5+7;

ll n,m,k,l,r,q,t;
ll a[DIM];

//--------------------------------|

int main()
{
    speedup;

    cin >> n >> q;

    for (int i=1;i<=n;i++)
    {
        cin >> a[i];
    }

    while(q--)
    {
        cin >> t;
        if (t==1)
        {
            cin >> k >> l;
            a[k]=l;
        }
        else
        {
            cin >> l >> r;
            if ((r-l+1)%2==0) cout << 0 << endl;
            else
            {
                ll tmp=1;
                ll res=0;
                for (int i=l;i<=r;i++)
                {
                    if (tmp%2!=0) res^=a[i];
                    tmp++;
                }
                cout << res << endl;
            }
        }
    }

    return 0;
}

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