Submission #980906

#	Time	Username	Problem	Language	Result	Execution time	Memory
980906		LOLOLO	Railway Trip 2 (JOI22_ho_t4)	C++17	100 / 100	709 ms	68292 KiB

Main

#include <bits/stdc++.h>
#define ll long long
using namespace std;
 
#define           f     first
#define           s     second
#define           pb    push_back
#define           ep    emplace
#define           eb    emplace_back
#define           lb    lower_bound
#define           ub    upper_bound
#define       all(x)    x.begin(), x.end()
#define      rall(x)    x.rbegin(), x.rend()
#define   uniquev(v)    sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define     mem(f,x)    memset(f , x , sizeof(f))
#define        sz(x)    (int)(x).size()
#define  __lcm(a, b)    (1ll * ((a) / __gcd((a), (b))) * (b))
#define          mxx    *max_element
#define          mnn    *min_element
#define    cntbit(x)    __builtin_popcountll(x)
#define       len(x)    (int)(x.length())
 
const int N = 1e5 + 10;
pair <int, int> seg[20][N * 4];
pair <int, int> laz[N * 4];
int n, k;

pair <int, int> merge(pair <int, int> A, pair <int, int> B) {
    return {min(A.f, B.f), max(A.s, B.s)};
}

void push(int id, int l, int r, int u, int v, int k) {
    if (l > v || r < u)
        return;

    if (l >= u && r <= v) {
        laz[id] = merge(laz[id], {k, k});
        return;
    }

    int m = (l + r) / 2;
    push(id * 2, l, m, u, v, k);
    push(id * 2 + 1, m + 1, r, u, v, k);
}

void run(int id, int l, int r, pair <int, int> st) {
    st = merge(st, laz[id]);
    if (l == r) {
        seg[0][id] = merge({l, l}, st);
        return;
    }

    int m = (l + r) / 2;
    run(id * 2, l, m, st);
    run(id * 2 + 1, m + 1, r, st);
    seg[0][id] = merge(seg[0][id * 2], seg[0][id * 2 + 1]);
}

pair <int, int> range(int dep, int id, int l, int r, int u, int v) {
    if (l > v || r < u)
        return {n + 1, 0};

    if (l >= u && r <= v) {
        return seg[dep][id];
    }

    int m = (l + r) / 2;
    return merge(range(dep, id * 2, l, m, u, v), range(dep, id * 2 + 1, m + 1, r, u, v));
}

void build(int dep, int id, int l, int r) {
    if (l == r) {
        pair <int, int> st = seg[dep - 1][id];
        st = range(dep - 1, 1, 1, n, st.f, st.s);
        seg[dep][id] = st;
        return;
    }

    int m = (l + r) / 2;
    build(dep, id * 2, l, m);
    build(dep, id * 2 + 1, m + 1, r);
    seg[dep][id] = merge(seg[dep][id * 2], seg[dep][id * 2 + 1]);
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> n >> k; 

    for (int i = 1; i <= n * 4; i++) {
        laz[i].f = n + 1;
    }

    int m;
    cin >> m;

    for (int i = 1; i <= m; i++) {
        int x, y;
        cin >> x >> y;
        if (x <= y) {
            push(1, 1, n, x, min(x + k - 1, y - 1), y);
        } else {
            push(1, 1, n, max(y + 1, x - k + 1), x, y);
        }
    }

    run(1, 1, n, {n + 1, 0});
    for (int i = 1; i < 20; i++) 
        build(i, 1, 1, n);

    int q;
    cin >> q;

    while (q--) {
        int s, t;
        cin >> s >> t;
        int ans = 0;
        pair <int, int> inv = {s, s};

        for (int j = 19; j >= 0; j--) {
            pair <int, int> sel = range(j, 1, 1, n, inv.f, inv.s);
            if (sel.f <= t && sel.s >= t)
                continue;

            ans |= (1 << j);
            inv = sel;
        }

        if (ans > m) {
            ans = -2;
        }

        cout << ans + 1 << '\n';
    }

    return 0;
}  

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 11 / 11
• Subtask 4: 25 / 25
• Subtask 5: 35 / 35
• Subtask 6: 13 / 13