Submission #1013164

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013164		Pannda	Pinball (JOI14_pinball)	C++17	100 / 100	171 ms	15424 KiB

pinball

#include <bits/stdc++.h>
using namespace std;

// supports: point modify, range apply, range query, walk to find first/last with some precedent
// you are to implement the 2 structs Tag and Info
// for the walks, pass a lambda that takes in Info and return true iff the node with that Info will contain the desired element

template<class Info, class Tag>
struct LazySegmentTree {
    int n;
    vector<Info> info;
    vector<Tag> tag;
    LazySegmentTree() : n(0) {}
    LazySegmentTree(int n_, Info v_ = Info()) {
        init(n_, v_);
    }
    template<class T>
    LazySegmentTree(vector<T> init_) {
        init(init_);
    }
    void init(int n_, Info v_ = Info()) {
        init(vector<Info>(n_, v_));
    }
    template<class T>
    void init(vector<T> init_) {
        n = init_.size();
        info.assign(4 << __lg(n), Info());
        tag.assign(4 << __lg(n), Tag());
        function<void(int, int, int)> build = [&](int p, int l, int r) {
            if (r - l == 1) {
                info[p] = init_[l];
                return;
            }
            int m = (l + r) / 2;
            build(2 * p, l, m);
            build(2 * p + 1, m, r);
            pull(p);
        };
        build(1, 0, n);
    }
    void pull(int p) {
        info[p] = info[2 * p] + info[2 * p + 1];
    }
    void apply(int p, const Tag &v) {
        info[p].apply(v);
        tag[p].apply(v);
    }
    void push(int p) {
        apply(2 * p, tag[p]);
        apply(2 * p + 1, tag[p]);
        tag[p] = Tag();
    }
    void modify(int p, int l, int r, int x, const Info &v) {
        if (r - l == 1) {
            info[p] = v;
            return;
        }
        int m = (l + r) / 2;
        push(p);
        if (x < m) {
            modify(2 * p, l, m, x, v);
        } else {
            modify(2 * p + 1, m, r, x, v);
        }
        pull(p);
    }
    void modify(int p, const Info &v) {
        modify(1, 0, n, p, v);
    }
    Info rangeQuery(int p, int l, int r, int x, int y) {
        if (l >= y || r <= x) {
            return Info();
        }
        if (l >= x && r <= y) {
            return info[p];
        }
        int m = (l + r) / 2;
        push(p);
        return rangeQuery(2 * p, l, m, x, y) + rangeQuery(2 * p + 1, m, r, x, y);
    }
    Info rangeQuery(int l, int r) {
        return rangeQuery(1, 0, n, l, r);
    }
    void rangeApply(int p, int l, int r, int x, int y, const Tag &v) {
        if (l >= y || r <= x) {
            return;
        }
        if (l >= x && r <= y) {
            apply(p, v);
            return;
        }
        int m = (l + r) / 2;
        push(p);
        rangeApply(2 * p, l, m, x, y, v);
        rangeApply(2 * p + 1, m, r, x, y, v);
        pull(p);
    }
    void rangeApply(int l, int r, const Tag &v) {
        return rangeApply(1, 0, n, l, r, v);
    }
    template<class F>
    int findFirst(int p, int l, int r, int x, int y, F &&pred) {
        if (l >= y || r <= x) {
            return -1;
        }
        if (l >= x && r <= y && !pred(info[p])) {
            return -1;
        }
        if (r - l == 1) {
            return l;
        }
        int m = (l + r) / 2;
        push(p);
        int res = findFirst(2 * p, l, m, x, y, pred);
        if (res == -1) {
            res = findFirst(2 * p + 1, m, r, x, y, pred);
        }
        return res;
    }
    template<class F>
    int findFirst(int l, int r, F &&pred) {
        return findFirst(1, 0, n, l, r, pred);
    }
    template<class F>
    int findLast(int p, int l, int r, int x, int y, F &&pred) {
        if (l >= y || r <= x) {
            return -1;
        }
        if (l >= x && r <= y && !pred(info[p])) {
            return -1;
        }
        if (r - l == 1) {
            return l;
        }
        int m = (l + r) / 2;
        push(p);
        int res = findLast(2 * p + 1, m, r, x, y, pred);
        if (res == -1) {
            res = findLast(2 * p, l, m, x, y, pred);
        }
        return res;
    }
    template<class F>
    int findLast(int l, int r, F &&pred) {
        return findLast(1, 0, n, l, r, pred);
    }
};

const long long INF = 1e18;
struct Tag {
    long long mn = INF;
    void apply(const Tag &t) & {
        mn = min(mn, t.mn);
    }
};
struct Info {
    long long mn = INF;
    void apply(const Tag &t) & {
        mn = min(mn, t.mn);
    }
    Info operator+(const Info &b) {
        return {min(mn, b.mn)};
    }
};

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m;
    cin >> n >> m;
    vector<int> l(n), r(n), drop(n), cost(n);
    for (int i = 0; i < n; i++) {
        cin >> l[i] >> r[i] >> drop[i] >> cost[i];
    }

    vector<int> points = {1, m};
    points.insert(points.end(), drop.begin(), drop.end());
    sort(points.begin(), points.end());
    points.resize(unique(points.begin(), points.end()) - points.begin());
    const int C = points.size();
    for (int i = 0; i < n; i++) {
        l[i] = lower_bound(points.begin(), points.end(), l[i]) - points.begin();
        r[i] = lower_bound(points.begin(), points.end(), r[i] + 1) - points.begin();
        drop[i] = lower_bound(points.begin(), points.end(), drop[i]) - points.begin();
    }

    LazySegmentTree<Info, Tag> seg_l(C);
    seg_l.modify(0, {0});
    LazySegmentTree<Info, Tag> seg_r(C);
    seg_r.modify(C - 1, {0});
    long long ans = INF;

    for (int i = 0; i < n; i++) {
        long long get_l = seg_l.rangeQuery(l[i], r[i]).mn;
        long long get_r = seg_r.rangeQuery(l[i], r[i]).mn;
        ans = min(ans, get_l + get_r + cost[i]);
        seg_l.rangeApply(drop[i], drop[i] + 1, {cost[i] + get_l});
        seg_r.rangeApply(drop[i], drop[i] + 1, {cost[i] + get_r});
    }

    if (ans == INF) ans = -1;
    cout << ans << '\n';
}

• Subtask 1: 11 / 11
• Subtask 2: 18 / 18
• Subtask 3: 22 / 22
• Subtask 4: 49 / 49