/ SeriousOJ /

Record Detail

Accepted


  
# Status Time Cost Memory Cost
#1 Accepted 1ms 540.0 KiB
#2 Accepted 1ms 540.0 KiB
#3 Accepted 2ms 540.0 KiB
#4 Accepted 7ms 540.0 KiB
#5 Accepted 17ms 772.0 KiB
#6 Accepted 28ms 592.0 KiB
#7 Accepted 38ms 592.0 KiB
#8 Accepted 58ms 584.0 KiB
#9 Accepted 320ms 964.0 KiB
#10 Accepted 577ms 740.0 KiB
#11 Accepted 579ms 728.0 KiB
#12 Accepted 449ms 668.0 KiB
#13 Accepted 1652ms 101.613 MiB
#14 Accepted 1666ms 101.629 MiB
#15 Accepted 871ms 25.812 MiB
#16 Accepted 450ms 15.863 MiB
#17 Accepted 586ms 8.496 MiB
#18 Accepted 515ms 4.719 MiB
#19 Accepted 450ms 1.52 MiB
#20 Accepted 467ms 996.0 KiB
#21 Accepted 576ms 1.27 MiB

Code

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define all(x) (x).begin(), (x).end()
#define f(i, n) for (int i = 0; i < n; i++)
#define trace(x) cerr << #x << ": " << x << '\n'
const int B = 30;
int32_t main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int t;
    cin >> t;
    while (t--)
    {
        int n;
        cin >> n;
        vector<int> a(n + 1);
        for (int i = 1; i <= n; i++)
            cin >> a[i];
        vector<unordered_map<int, int>> cnt(B);
        for (auto &mp : cnt)
            mp.reserve(n / 2);
        ll ans = 0;
        for (int j = 1; j <= n; j++)
        {
            int aj = a[j];
            for (int k = 0; k < B; k++)
            {
                int left = (((aj >> (k + 1)) ^ (j >> (k + 1))) << 1);
                int right = (((aj >> k) & 1) ^ ((j >> k) & 1) ^ 1);
                int key = left | right;
                auto it = cnt[k].find(key);
                if (it != cnt[k].end())
                    ans += it->second;
            }
            for (int k = 0; k < B; k++)
            {
                if (((aj >> k) & 1) == ((j >> k) & 1))
                {
                    int key = ((aj >> (k + 1)) << 1) | ((j >> k) & 1);
                    cnt[k][key]++;
                }
            }
        }
        cout << ans << '\n';
    }
    return 0;
}

Information

Submit By
Type
Submission
Problem
P1198 E. Good Signal Pairs
Contest
Brain Booster #10
Language
C++17 (G++ 13.2.0)
Submit At
2025-06-13 17:09:30
Judged At
2025-06-13 17:09:30
Judged By
Score
100
Total Time
1666ms
Peak Memory
101.629 MiB