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Submission #485710

# Submission time Handle Problem Language Result Execution time Memory
485710 2021-11-09T04:56:31 Z KazamaHoang Index (COCI21_index) C++14
110 / 110
 596 ms 8584 KB 
#include <bits/stdc++.h>

using namespace std;

const int B = 500;

struct FenwickTree {
    int n;
    vector<int> tree;

    FenwickTree(int _n) {
        n = _n;
        tree.resize(n+5, 0);
    }

    void update(int x) {
        for (; x <= n; x += x & -x)
            tree[x] ++;
    }

    int get(int x) {
        int res = 0;
        for (; x; x -= x & -x)
            res += tree[x];
        return res;
    }
};

int n, q;
pair<int, int> a[200005];
int l[200005], r[200005];
int lo[200005], hi[200005];

int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> q;
    for (int i = 1; i <= n; ++ i) {
        cin >> a[i].first;
        a[i].second = i;
    }
    for (int i = 1; i <= q; ++ i) {
        cin >> l[i] >> r[i];
        lo[i] = 0, hi[i] = n + 1;
    }
    sort(a + 1, a + 1 + n);
    int rem = q;
    for (;;) {
        vector<pair<int, int>> mid(rem);
        for (int i = 1, cnt = 0; i <= q; ++ i)
            if (hi[i] - lo[i] > 1) {
                int cur = (lo[i] + hi[i]) >> 1;
                mid[cnt++] = {cur, i};
            }
        sort(mid.begin(), mid.end());
        reverse(mid.begin(), mid.end());
        FenwickTree ft(n);
        int run = n;
        for (auto& pii : mid) {
            while (run >= 1 && a[run].first >= pii.first) {
                ft.update(a[run].second);
                -- run;
            }
            int u = pii.second;
            int cur = ft.get(r[u]) - ft.get(l[u]-1);
            if (cur >= pii.first)
                lo[u] = pii.first;
            else
                hi[u] = pii.first; 
            if (hi[u] - lo[u] == 1) -- rem;
        }
        if (rem == 0) break;
    }
    for (int i = 1; i <= q; ++ i)
        cout << lo[i] << "\n";
    return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 2 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 2 ms 332 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 2 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 2 ms 332 KB Output is correct
11 Correct 113 ms 2340 KB Output is correct
12 Correct 115 ms 2340 KB Output is correct
13 Correct 119 ms 2340 KB Output is correct
14 Correct 107 ms 2404 KB Output is correct
15 Correct 105 ms 2344 KB Output is correct
16 Correct 115 ms 2336 KB Output is correct
17 Correct 104 ms 2284 KB Output is correct
18 Correct 108 ms 2412 KB Output is correct
19 Correct 115 ms 2380 KB Output is correct
20 Correct 117 ms 2336 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 2 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 2 ms 332 KB Output is correct
11 Correct 113 ms 2340 KB Output is correct
12 Correct 115 ms 2340 KB Output is correct
13 Correct 119 ms 2340 KB Output is correct
14 Correct 107 ms 2404 KB Output is correct
15 Correct 105 ms 2344 KB Output is correct
16 Correct 115 ms 2336 KB Output is correct
17 Correct 104 ms 2284 KB Output is correct
18 Correct 108 ms 2412 KB Output is correct
19 Correct 115 ms 2380 KB Output is correct
20 Correct 117 ms 2336 KB Output is correct
21 Correct 540 ms 8492 KB Output is correct
22 Correct 530 ms 8496 KB Output is correct
23 Correct 548 ms 8524 KB Output is correct
24 Correct 552 ms 8508 KB Output is correct
25 Correct 596 ms 8560 KB Output is correct
26 Correct 574 ms 8508 KB Output is correct
27 Correct 586 ms 8492 KB Output is correct
28 Correct 527 ms 8584 KB Output is correct
29 Correct 534 ms 8492 KB Output is correct
30 Correct 566 ms 8448 KB Output is correct