Submission #266416

#	Time	Username	Problem	Language	Result	Execution time	Memory
266416		dolphingarlic	Two Antennas (JOI19_antennas)	C++14	22 / 100	404 ms	33448 KiB

antennas

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

const int oo = 1e9;

int n, a[200001], b[200001], h[200001], ans[200001];
vector<int> ins[400001], rem[400001];
int segtree[800001];

void build(int node = 1, int l = 1, int r = n) {
    segtree[node] = -oo;
    if (l != r) {
        int mid = (l + r) / 2;
        build(node * 2, l, mid); build(node * 2 + 1, mid + 1, r);
    }
}

void update(int pos, int val, int node = 1, int l = 1, int r = n) {
    if (l == r) segtree[node] = val;
    else {
        int mid = (l + r) / 2;
        if (pos > mid) update(pos, val, node * 2 + 1, mid + 1, r);
        else update(pos, val, node * 2, l, mid);
        segtree[node] = max(segtree[node * 2], segtree[node * 2 + 1]);
    }
}

int query(int x, int y, int node = 1, int l = 1, int r = n) {
    if (l > y || r < x) return -oo;
    if (l >= x && r <= y) return segtree[node];
    int mid = (l + r) / 2;
    return max(query(x, y, node * 2, l, mid), query(x, y, node * 2 + 1, mid + 1, r));
}

void solve() {
    build();
    for (int i = 1; i <= n; i++) {
        for (int j : ins[i]) update(j, h[j]);
        ans[i] = max(ans[i], query(i - b[i], i - a[i]) - h[i]);
        for (int j : rem[i]) update(j, -oo);
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> h[i] >> a[i] >> b[i];
        ins[i + a[i]].push_back(i);
        rem[i + b[i]].push_back(i);
    }
    int q;
    cin >> q;
    // for (int i = 1; i <= q; i++) {
    //     cin >> queries[i].first.first >> queries[i].first.second;
    // }
    if (q == 1) {
        memset(ans, -1, sizeof ans);
        solve();
        for (int i = 1; i <= n; i++) h[i] *= -1;
        solve();
        cout << *max_element(ans + 1, ans + n + 1);
    } else {
        cout << "TODO :(";
    }
    return 0;
}

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