Submission #631221

#	Time	Username	Problem	Language	Result	Execution time	Memory
631221		Ooops_sorry	Railway Trip 2 (JOI22_ho_t4)	C++17	0 / 100	103 ms	38936 KiB

Main

#include<bits/stdc++.h>

using namespace std;

mt19937 rnd(51);

#define ll long long
#define pb push_back
#define ld long double

const int INF = 1e9;

struct SparseTable {
    int n;
    vector<vector<int>> po_min, po_max;
    vector<int> lg;
    SparseTable(vector<int> a) {
        n = a.size();
        lg.resize(n + 1);
        po_min.resize(20);
        po_max.resize(20);
        for (int i = 0; i < 20; i++) {
            po_min[i].resize(n);
            po_max[i].resize(n);
            if ((1 << i) <= n) {
                lg[1 << i] = i;
            }
        }
        for (int i = 1; i <= n; i++) {
            lg[i] = max(lg[i], lg[i - 1]);
        }
        for (int i = 0; i < n; i++) {
            po_min[0][i] = po_max[0][i] = a[i];
        }
        for (int i = 1; i < 20; i++) {
            for (int j = 0; j + (1 << i) <= n; j++) {
                po_min[i][j] = min(po_min[i - 1][j], po_min[i - 1][j + (1 << (i - 1))]);
                po_max[i][j] = max(po_max[i - 1][j], po_max[i - 1][j + (1 << (i - 1))]);
            }
        }
    }
    int get_min(int l, int r) {
        int d = lg[r - l + 1];
        return min(po_min[d][l], po_min[d][r - (1 << d) + 1]);
    }
    int get_max(int l, int r) {
        int d = lg[r - l + 1];
        return max(po_max[d][l], po_max[d][r - (1 << d) + 1]);
    }
};

signed main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
#endif // LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, k, m;
    cin >> n >> k >> m;
    vector<int> a(m), b(m);
    vector<vector<int>> add_l(n + 1), add_r(n + 1), del_l(n + 1), del_r(n + 1);
    for (int i = 0; i < m; i++) {
        cin >> a[i] >> b[i];
        a[i]--, b[i]--;
        if (a[i] < b[i]) {
            add_r[a[i]].pb(b[i]);
            del_r[min(b[i], a[i] + k)].pb(b[i]);
        } else {
            add_l[max(b[i], a[i] - k + 1)].pb(b[i]);
            del_l[a[i] + 1].pb(b[i]);
        }
    }
    set<int> st_r{-INF}, st_l{INF};
    vector<int> up_l(n), up_r(n);
    for (int i = 0; i < n; i++) {
        for (auto to : add_r[i]) {
            st_r.insert(to);
        }
        for (auto to : del_r[i]) {
            st_r.erase(st_r.find(to));
        }
        up_r[i] = *st_r.rbegin();
        for (auto to : add_l[i]) {
            st_l.insert(to);
        }
        for (auto to : del_l[i]) {
            st_l.erase(st_l.find(to));
        }
        up_l[i] = *st_l.begin();
    }
    SparseTable L(up_l), R(up_r);
    int q;
    cin >> q;
    for (int i = 0; i < q; i++) {
        int s, t;
        cin >> s >> t;
        s--, t--;
        pair<int,int> seg{s, s};
        int ans = 0;
        while (!(seg.first <= t && t <= seg.second)) {
            pair<int,int> new_seg{min(seg.first, L.get_min(seg.first, seg.second)), max(seg.second, R.get_max(seg.first, seg.second))};
            if (seg == new_seg) {
                ans = -1;
                break;
            }
            seg = new_seg;
            ans++;
        }
        cout << ans << endl;
    }
    return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 8
• Subtask 3: 0 / 11
• Subtask 4: 0 / 25
• Subtask 5: 0 / 35
• Subtask 6: 0 / 13