Submission #1274920

#	Time	Username	Problem	Language	Result	Execution time	Memory
1274920		hoangtien69	Two Antennas (JOI19_antennas)	C++20	0 / 100	179 ms	42576 KiB

antennas

#include<bits/stdc++.h>
using namespace std;
const int MAXN = 2e5 + 5;
#define int long long
#define pii pair<int,int>
const int INF = 1e18;

int n;
int a[MAXN], b[MAXN], h[MAXN];
int q;
vector<pii> peal[MAXN];
vector<pii> query[MAXN];
int ans[MAXN];
struct Node
{
    int maxx, minn, res;
    Node() : maxx(-INF), minn(INF), res(-INF) {}
};

Node st[4 * MAXN];
pii lazy[4 * MAXN];

Node Merge(Node A, Node B)
{
    Node result;
    result.maxx = max(A.maxx, B.maxx);
    result.minn = min(A.minn, B.minn);
    result.res = max(A.res, B.res);
    return result;
}
void build(int id, int l, int r)
{
    if (l == r)
    {
        st[id] = Node();
        return;
    }
    int m = (l + r) / 2;
    build(id * 2, l, m);
    build(id * 2 + 1, m + 1, r);
    st[id] = Merge(st[id * 2], st[id * 2 + 1]);
}
void push(int id, int l, int r)
{
    lazy[id * 2].first = max(lazy[id * 2].first, lazy[id].first);
    lazy[id * 2].second = min(lazy[id * 2].second, lazy[id].second);
    lazy[id * 2 + 1].first = max(lazy[id * 2 + 1].first, lazy[id].first);
    lazy[id * 2 + 1].second = min(lazy[id * 2 + 1].second, lazy[id].second);

    st[id * 2].res = max({st[id * 2].res, st[id * 2].maxx - lazy[id].second, lazy[id].first - st[id * 2].minn});
    st[id * 2 + 1].res = max({st[id * 2 + 1].res, st[id * 2 + 1].maxx - lazy[id].second, lazy[id].first - st[id * 2 + 1].minn});

    lazy[id] = {-INF, INF};
}
void update(int id, int l, int r, int pos, int val1, int val2)
{
    if (l == r)
    {
        st[id].maxx = val1;
        st[id].minn = val2;
        st[id].res = -INF;
        return;
    }
    int m = (l + r) / 2;
    push(id, l, r);
    if (pos <= m)
    {
        update(id * 2, l, m, pos, val1, val2);
    }
    else
    {
        update(id * 2 + 1, m + 1, r, pos, val1, val2);
    }
    st[id] = Merge(st[id * 2], st[id * 2 + 1]);
}
void update_range(int id, int l, int r, int u, int v, int val)
{
    if (r < u || v < l) return;

    if (u <= l && r <= v)
    {
        lazy[id].first = max(lazy[id].first, val);
        lazy[id].second = min(lazy[id].second, val);
        st[id].res = max({st[id].res, lazy[id].first - st[id].minn, st[id].maxx - lazy[id].second});
        return;
    }

    push(id, l, r);
    int m = (l + r) / 2;
    update_range(id * 2, l, m, u, v, val);
    update_range(id * 2 + 1, m + 1, r, u, v, val);
    st[id] = Merge(st[id * 2], st[id * 2 + 1]);
}
Node get(int id, int l, int r, int u, int v)
{
    if (v < l || r < u) return Node();

    push(id, l, r);
    if (u <= l && r <= v) return st[id];

    int m = (l + r) / 2;
    return Merge(get(id * 2, l, m, u, v), get(id * 2 + 1, m + 1, r, u, v));
}

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

    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> h[i] >> a[i] >> b[i];
    }
    cin >> q;
    for (int i = 1; i <= q; i++)
    {
        int l, r;
        cin >> l >> r;
        query[r].push_back({l, i});
    }
    for (int i = 1; i <= n; i++)
    {
        if (i + a[i] <= n) peal[i + a[i]].push_back({i, 1});
        if (i + b[i] + 1 <= n) peal[i + b[i] + 1].push_back({i, -1});
    }
    build(1, 1, n);
    for (int i = 1; i <= 4 * n; i++)
    {
        lazy[i] = {-INF, INF};
    }
    for (int i = 1; i <= n; i++)
    {
        for (auto [pos, type] : peal[i])
        {
            if (type == 1)
            {
                update(1, 1, n, pos, h[pos], h[pos]);
            }
            else
            {
                update(1, 1, n, pos, -INF, INF);
            }
        }
        int left = max(1LL, i - b[i]);
        int right = i - a[i];
        if (left <= right)
        {
            update_range(1, 1, n, left, right, h[i]);
        }

        for (auto [left_query, id] : query[i])
        {
            Node result = get(1, 1, n, left_query, i);
            ans[id] = result.res;
            ans[id] = max(-1LL, ans[id]);
        }
    }
    for (int i = 1; i <= q; i++)
    {
        cout << ans[i] << "\n";
    }
}

• Subtask 1: 0 / 2
• Subtask 2: 0 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 65