Submission #960889

#	Time	Username	Problem	Language	Result	Execution time	Memory
960889		Yang8on	XORanges (eJOI19_xoranges)	C++14	0 / 100	318 ms	50000 KiB

xoranges

#include <bits/stdc++.h>
#define Y8o "xoranges"
#define maxn 200005
#define ll long long
#define pii pair<int, int>
#define gb(i, j) ((i >> j) & 1)

using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll GetRandom(ll l, ll r) {
    return uniform_int_distribution<ll> (l, r) (rng);
}
void iof() {
    if(fopen(Y8o".inp", "r"))
    {
        freopen(Y8o".inp", "r", stdin);
//        freopen(Y8o".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(NULL), cout.tie(NULL);
}
void ctime() {
    cerr << "\n" << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
}


int n, Q;
int a[maxn];

struct BIT {

    int bit[maxn][2][30];

    void update(int x, int t, int pos, int val)
    {
        while(x <= maxn - 5)
        {
            bit[x][t][pos] += val;
            x += (x & -x);
        }
    }

    int get(int x, int t, int pos)
    {
        int best = 0;
        while(x)
        {
            best += bit[x][t][pos];
            x -= (x & -x);
        }
        return best;
    }

} B;

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

    for(int i = 1; i <= n; i ++) for(int j = 0; j <= 29; j ++)
        if(gb( a[i], j )) B.update(i, i % 2, j, +1);

    for(int i = 1, id, u, v, l, r; i <= Q; i ++)
    {
        cin >> id >> u >> v, l = u, r = v;
        if(id == 1) /// a[u] = v
        {
            for(int j = 0; j <= 29; j ++)
            {
                if(gb(a[u], j) != gb(v, j))
                {
                    if(gb(v, j)) B.update(u, u % 2, j, +1);
                    else         B.update(u, u % 2, j, -1);
                }
            } a[u] = v;
        }
        else /// get range (l, r)
        {
            int ans = 0, st = l % 2, len = (r - l + 1) % 2;
            int t = (st != len) ? 0 : 1;

            for(int j = 0; j <= 29; j ++)
            {
                int left = l == 1 ? 0 : B.get(l - 1, t, j);
                int right = B.get(r, t, j);

                ans += (1 << j) * ( (right - left) % 2 );
            }

            cout << ans << '\n';
        }
    }
}


int main()
{
    iof();

    int nTest = 1;
//    cin >> nTest;

    while(nTest --) {
        solve();
    }

    ctime();
    return 0;
}

Compilation message (stderr)

xoranges.cpp: In function 'void iof()':
xoranges.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen(Y8o".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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