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Submission #97177

# Submission time Handle Problem Language Result Execution time Memory
97177 2019-02-14T09:34:55 Z popovicirobert XOR Sum (info1cup17_xorsum) C++14
77 / 100
 1600 ms 29452 KB 
#include <bits/stdc++.h>
#define ll long long

using namespace std;

const int MAXN = (int) 1e6;

int arr[MAXN + 1];
pair <int, int> nrm[MAXN + 1], aux[MAXN + 1];

int main() {
    //ifstream cin("A.in");
    //ofstream cout("A.out");
    int i, n;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    cin >> n;
    for(i = 1; i <= n; i++) {
        cin >> arr[i];
        nrm[i] = {arr[i] & 1, i};
    }
    sort(nrm + 1, nrm + n + 1);
    int ans = 0;
    for(int bit = 0; bit < 29; bit++) {
        ll cur = 0;
        int l0 = n, r0 = n;
        int l1 = n, r1 = n;
        for(i = 1; i <= n; i++) {
            while(l0 >= 1 && nrm[i].first + nrm[l0].first >= (1 << bit)) {
                l0--;
            }
            while(r0 >= 1 && nrm[i].first + nrm[r0].first >= (1 << (bit + 1))) {
                r0--;
            }
            while(l1 >= 1 && nrm[i].first + nrm[l1].first >= (1 << (bit + 1)) + (1 << bit)) {
                l1--;
            }
            while(r1 >= 1 && nrm[i].first + nrm[r1].first >= (1 << (bit + 2))) {
                r1--;
            }
            cur += r1 - l1 + r0 - l0;
            cur += (((2 * nrm[i].first) & (1 << bit)) > 0);
        }
        cur /= 2, cur &= 1;
        ans += cur * (1 << bit);
        int sz = 0;
        for(i = 1; i <= n; i++) {
            int cur = nrm[i].second;
            if((arr[cur] & (1 << (bit + 1))) == 0) {
                aux[++sz] = {arr[cur] & ((1 << (bit + 2)) - 1), cur};
            }
        }
        for(i = 1; i <= n; i++) {
            int cur = nrm[i].second;
            if(arr[cur] & (1 << (bit + 1))) {
                aux[++sz] = {arr[cur] & ((1 << (bit + 2)) - 1), cur};
            }
        }
        for(i = 1; i <= n; i++) {
            nrm[i] = aux[i];
        }
    }
    cout << ans;
    //cin.close();
    //cout.close();
    return 0;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 512 KB Output is correct
2 Correct 6 ms 512 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 986 ms 24500 KB Output is correct
2 Correct 954 ms 22812 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 986 ms 24500 KB Output is correct
2 Correct 954 ms 22812 KB Output is correct
3 Correct 1329 ms 26772 KB Output is correct
4 Correct 1163 ms 25720 KB Output is correct

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 512 KB Output is correct
2 Correct 6 ms 512 KB Output is correct
3 Correct 122 ms 3192 KB Output is correct
4 Correct 124 ms 3320 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 512 KB Output is correct
2 Correct 6 ms 512 KB Output is correct
3 Correct 986 ms 24500 KB Output is correct
4 Correct 954 ms 22812 KB Output is correct
5 Correct 1329 ms 26772 KB Output is correct
6 Correct 1163 ms 25720 KB Output is correct
7 Correct 122 ms 3192 KB Output is correct
8 Correct 124 ms 3320 KB Output is correct
9 Correct 1482 ms 29452 KB Output is correct
10 Correct 1551 ms 29432 KB Output is correct
11 Execution timed out 1649 ms 29404 KB Time limit exceeded