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Submission #485707

# Submission time Handle Problem Language Result Execution time Memory
485707 2021-11-09T04:01:40 Z KazamaHoang Index (COCI21_index) C++14
110 / 110
 829 ms 9924 KB 
#include <bits/stdc++.h>

using namespace std;

const int B = 500;

struct FenwickTree {
    vector<int> tree;

    FenwickTree() {
        tree.resize((int)2e5 + 5, 0);
    }

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

    int get(int x) {
        int res = 0;
        for (; x <= (int)2e5; x += x & -x)
            res += tree[x];
        return res;
    }
};

int n, q;
int a[200005];
int l[200005], r[200005], id[200005], ans[200005];
FenwickTree ft;

bool comp(int u, int v) {
    if (l[u] / B != l[v] / B)
        return l[u] / B < l[v] / B;
    return r[u] < r[v];
}

void add(int u, int sign) {
    ft.update(a[u], sign);    
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> q;
    for (int i = 1; i <= n; ++ i)
        cin >> a[i];
    for (int i = 1; i <= q; ++ i) {
        cin >> l[i] >> r[i];
        id[i] = i;
    }
    sort(id + 1, id + 1 + q, comp);
    for (int i = 1, curL = 2, curR = 1; i <= q; ++ i) {
        int u = id[i];
        while (curL > l[u]) add(-- curL, 1);
        while (curL < l[u]) add(curL ++, -1);
        while (curR < r[u]) add(++ curR, 1);
        while (curR > r[u]) add(curR --, -1);
        int lo = 0, hi = n + 1;
        while (hi - lo > 1) {
            int mid = (hi + lo) >> 1;
            if (ft.get(mid) >= mid) 
                lo = mid;
            else 
                hi = mid;
        }
        ans[u] = lo;
    }
    for (int i = 1; i <= q; ++ i) 
        cout << ans[i] << "\n";
    return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1100 KB Output is correct
2 Correct 2 ms 1100 KB Output is correct
3 Correct 2 ms 1100 KB Output is correct
4 Correct 3 ms 1100 KB Output is correct
5 Correct 3 ms 1100 KB Output is correct
6 Correct 1 ms 1100 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1100 KB Output is correct
9 Correct 1 ms 1100 KB Output is correct
10 Correct 1 ms 1100 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1100 KB Output is correct
2 Correct 2 ms 1100 KB Output is correct
3 Correct 2 ms 1100 KB Output is correct
4 Correct 3 ms 1100 KB Output is correct
5 Correct 3 ms 1100 KB Output is correct
6 Correct 1 ms 1100 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1100 KB Output is correct
9 Correct 1 ms 1100 KB Output is correct
10 Correct 1 ms 1100 KB Output is correct
11 Correct 146 ms 3168 KB Output is correct
12 Correct 146 ms 3164 KB Output is correct
13 Correct 148 ms 3268 KB Output is correct
14 Correct 150 ms 3108 KB Output is correct
15 Correct 150 ms 3164 KB Output is correct
16 Correct 147 ms 3140 KB Output is correct
17 Correct 150 ms 3168 KB Output is correct
18 Correct 145 ms 3140 KB Output is correct
19 Correct 145 ms 3116 KB Output is correct
20 Correct 153 ms 3172 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1100 KB Output is correct
2 Correct 2 ms 1100 KB Output is correct
3 Correct 2 ms 1100 KB Output is correct
4 Correct 3 ms 1100 KB Output is correct
5 Correct 3 ms 1100 KB Output is correct
6 Correct 1 ms 1100 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1100 KB Output is correct
9 Correct 1 ms 1100 KB Output is correct
10 Correct 1 ms 1100 KB Output is correct
11 Correct 146 ms 3168 KB Output is correct
12 Correct 146 ms 3164 KB Output is correct
13 Correct 148 ms 3268 KB Output is correct
14 Correct 150 ms 3108 KB Output is correct
15 Correct 150 ms 3164 KB Output is correct
16 Correct 147 ms 3140 KB Output is correct
17 Correct 150 ms 3168 KB Output is correct
18 Correct 145 ms 3140 KB Output is correct
19 Correct 145 ms 3116 KB Output is correct
20 Correct 153 ms 3172 KB Output is correct
21 Correct 789 ms 9844 KB Output is correct
22 Correct 797 ms 9800 KB Output is correct
23 Correct 791 ms 9852 KB Output is correct
24 Correct 792 ms 9848 KB Output is correct
25 Correct 776 ms 9796 KB Output is correct
26 Correct 792 ms 9852 KB Output is correct
27 Correct 778 ms 9916 KB Output is correct
28 Correct 783 ms 9852 KB Output is correct
29 Correct 784 ms 9924 KB Output is correct
30 Correct 829 ms 9796 KB Output is correct