oj.uz

Submission #232161

# Submission time Handle Problem Language Result Execution time Memory
232161 2020-05-16T10:17:11 Z VEGAnn XOR Sum (info1cup17_xorsum) C++14
45 / 100
 1600 ms 10224 KB 
#include <bits/stdc++.h>
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define PB push_back
#define MP make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pil pair<int, ll>
#define pli pair<ll, int>
#define pdd pair<ld, ld>
#define ft first
#define sd second
using namespace std;
using namespace __gnu_cxx;
using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
template<class T>
using ordered_set = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
const int N = 1000100;
const int M = 100100;
const int BIG = int(5e6);
const int oo = 2e9;
const ll OO = 1e18;
const int md = 998244353;
const int PW = 30;
ll sum;
vector<int> vc;
int a[N], ans = 0, n, mask, mn, mx, l1, r1, l2, r2;

void calc(int &l, int &r){
    while (l > 0 && vc[l - 1] >= mn)
        l--;

    while (r >= 0 && vc[r] > mx)
        r--;

    sum += r - l + 1;
}

int main() {
#ifdef _LOCAL
    freopen("in.txt","r",stdin); //freopen("output.txt","w",stdout);
#else
//    freopen("mining.in","r",stdin); freopen("mining.out","w",stdout);
    ios_base::sync_with_stdio(0); cin.tie(0);
#endif

    cin >> n;

    for (int i = 0; i < n; i++)
        cin >> a[i];

    for (int bt = 0; bt < PW; bt++){
        vc.clear();

        mask = (1 << (bt + 1)) - 1;

        for (int i = 0; i < n; i++)
            vc.PB(a[i] & mask);

        sort(all(vc));

        sum = 0;

        l1 = n, r1 = n - 1, l2 = n, r2 = n - 1;

        for (int cr : vc){
            mn = (1 << bt) - cr;
            mx = (1 << (bt + 1)) - 1 - cr;

            calc(l1, r1);

            if (cr >= mn && cr <= mx)
                sum--;

            mn += (1 << (bt + 1));
            mx = (1 << (bt + 2)) - 1 - cr;

            calc(l2, r2);

            if (cr >= mn && cr <= mx)
                sum--;
        }

        sum /= 2;

        if (sum & 1)
            ans += (1 << bt);
    }

    for (int i = 0; i < n; i++)
        ans ^= (a[i] + a[i]);

    cout << ans;

    return 0;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 384 KB Output is correct
2 Correct 15 ms 384 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1680 ms 10224 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1680 ms 10224 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 384 KB Output is correct
2 Correct 15 ms 384 KB Output is correct
3 Correct 273 ms 2304 KB Output is correct
4 Correct 281 ms 2304 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 384 KB Output is correct
2 Correct 15 ms 384 KB Output is correct
3 Execution timed out 1680 ms 10224 KB Time limit exceeded
4 Halted 0 ms 0 KB -