Submission #995511

#	Time	Username	Problem	Language	Result	Execution time	Memory
995511		shiomusubi496	Meetings (IOI18_meetings)	C++17	19 / 100	5531 ms	20528 KiB

meetings

#include "meetings.h"
#include <bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define rep2(i, a, b) for (int i = (int)(a); i < (int)(b); ++i)
#define rrep(i, n) for (int i = (int)(n) - 1; i >= 0; --i)
#define rrep2(i, a, b) for (int i = (int)(b) - 1; i >= (int)(a); --i)
#define all(v) begin(v), end(v)
#define rall(v) rbegin(v), rend(v)

using namespace std;

using ll = long long;

template<class T, class U> bool chmin(T& a, const U& b) { return a > b ? a = b, true : false; }
template<class T, class U> bool chmax(T& a, const U& b) { return a < b ? a = b, true : false; }

template<class M>
class SparseTable {
    using T = typename M::T;
    int n, h;
    vector<vector<T>> dat;

public:
    SparseTable(vector<T> a) {
        n = a.size();
        h = __lg(n) + 1;
        dat.assign(h + 1, vector<T>(n, M::id()));
        rep (i, n) dat[0][i] = a[i];
        rep (i, h) rep (j, n - (1 << i)) {
            dat[i + 1][j] = M::op(dat[i][j], dat[i][j + (1 << i)]);
        }
    }
    T prod(int l, int r) {
        assert(0 <= l && l <= r && r <= n);
        if (l == r) return M::id();
        int i = __lg(r - l);
        return M::op(dat[i][l], dat[i][r - (1 << i)]);
    }
};

constexpr int inf = 1.01e9;
constexpr ll infl = 1e18;

struct Min {
    using T = int;
    static T op(T a, T b) { return min(a, b); }
    static T id() { return inf; }
};
struct PairMax {
    using T = pair<int, int>;
    static T op(T a, T b) { return max(a, b); }
    static T id() { return {-inf, -1}; }
};

std::vector<long long> minimum_costs(std::vector<int> H, std::vector<int> L, std::vector<int> R) {
    SparseTable<PairMax> st([&] {
        vector<pair<int, int>> a(H.size());
        rep (i, H.size()) a[i] = {H[i], i};
        return a;
    }());
    int Q = L.size();
    vector<ll> ans(Q);
    rep (i, Q) {
        auto dfs = [&](auto& dfs, int l, int r) -> ll {
            if (l == r) return 0;
            if (l + 1 == r) return H[l];
            auto [h, idx] = st.prod(l, r);
            ll res = infl;
            chmin(res, dfs(dfs, l, idx) + h * (ll)(r - idx));
            chmin(res, dfs(dfs, idx + 1, r) + h * (ll)(idx - l + 1));
            return res;
        };
        ans[i] = dfs(dfs, L[i], ++R[i]);
    }
    return ans;
}

• Subtask 1: 4 / 4
• Subtask 2: 15 / 15
• Subtask 3: 0 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 40