Submission #476341

#	Time	Username	Problem	Language	Result	Execution time	Memory
476341		palilo	Art Exhibition (JOI18_art)	C++17	0 / 100	1 ms	204 KiB

art

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

template <class T>
bool chmin(T& _old, T _new) { return _old > _new && (_old = _new, true); }
template <class T>
bool chmax(T& _old, T _new) { return _old < _new && (_old = _new, true); }

constexpr int64_t INF = 0x3f3f3f3f3f3f3f3f;

template <typename T>
class binary_indexed_tree {
    const size_t n;
    vector<T> tree;

public:
    binary_indexed_tree(size_t n) : n(n), tree(n + 1, ~INF) {}

    void update(size_t i, T val) {
        for (++i; i <= n; i += i & -i)
            chmax(tree[i], val);
    }
    T query(size_t i) const {
        T ret = ~INF;
        for (; i; i &= i - 1)
            chmax(ret, tree[i]);
        return ret;
    }
};

template <typename node_t>
class segtree {
    // change this (1/2)
    const node_t e = ~INF;
    // change this (1/2)
    const size_t n;
    vector<node_t> tree;

public:
    segtree(size_t n) : n(n), tree(n << 1, e) {}

    node_t& operator[](size_t i) { return tree[n + i]; }
    void build() {
        for (size_t i = n; i--;) {
            pull(i);
        }
    }
    void set(size_t idx, node_t val) {
        assert(0 <= idx and idx < n);
        tree[idx += n] = val;
        while (idx >>= 1) pull(idx);
    }
    node_t prod(size_t l, size_t r) const {
        assert(0 <= l and l <= r and r <= n);
        node_t ret = e;
        for (l += n, r += n; l != r; l >>= 1, r >>= 1) {
            if (l & 1) ret = op(ret, tree[l++]);
            if (r & 1) ret = op(tree[--r], ret);
        }
        return ret;
    }
    node_t all_prod() const { return tree[1]; }
    void clear() { fill(tree.begin(), tree.end(), e); }

private:
    void pull(size_t i) {
        tree[i] = op(tree[i << 1], tree[i << 1 | 1]);
    }
    // change this (2/2)
    node_t op(node_t lhs, node_t rhs) const {
        return max(lhs, rhs);
    }
    // change this (2/2)
};

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
#ifdef palilo
    freopen("in", "r", stdin);
    freopen("out", "w", stdout);
#endif
    int n;
    cin >> n;
    vector<pair<int64_t, int64_t>> a(n);
    for (auto& [x, y] : a) {
        cin >> x >> y;
    }
    sort(a.begin(), a.end(), [&](const auto& lhs, const auto& rhs) {
        return lhs.first < rhs.first;
    });
    vector<int64_t> pref(n + 1);
    for (int i = 0; i < n; ++i) {
        pref[i + 1] = pref[i] + a[i].second;
    }
    segtree<int64_t> seg(n);
    for (int i = 0; i < n; ++i) {
        seg.set(i, a[i].first - pref[i]);
    }
    int64_t ans = ~INF;
    for (int r = 1; r < n; ++r) {
        chmax(ans, pref[r] - a[r - 1].first + seg.prod(0, r));
    }
    cout << ans;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 50