Submission #694850

#	Time	Username	Problem	Language	Result	Execution time	Memory
694850		Tien_Noob	Two Antennas (JOI19_antennas)	C++17	100 / 100	538 ms	49800 KiB

antennas

//Make CSP great again
//Vengeance
#include <bits/stdc++.h>
#define TASK "TESTCODE"
using namespace std;
const int N = 2e5;
int n, q, h[N + 1], a[N + 1], b[N + 1], res[N + 1];
vector<pair<int, int> > query[N + 1];
vector<int> add[N + 1], del[N + 1];
void read()
{
    cin >> n;
    for (int i = 1; i <= n; ++ i)
    {
        cin >> h[i] >> a[i] >> b[i];
        if (i + a[i] <= n)
        {
            add[i + a[i]].push_back(i);
            del[min(n, i + b[i])].push_back(i);
        }
    }
    cin >> q;
    for (int i = 1; i <= q; ++ i)
    {
        int l, r;
        cin >> l >> r;
        query[r].emplace_back(l, i);
    }
}
struct SegmentTree
{
    int val[4 * N + 1], mna[4 * N + 1], mxa[4 * N + 1];
    int lazy_mnb[4 * N + 1], lazy_mxb[4 * N + 1];
    SegmentTree()
    {
        for (int i = 1; i <= 4 * N; ++ i)
        {
            val[i] = -1;
            mxa[i] = lazy_mxb[i] = 0;
            mna[i] = lazy_mnb[i] = 1e9;
        }
    }
    void refine(int v)
    {
        if (min(mxa[v], lazy_mxb[v]) == 0)
        {
            return ;
        }
        val[v] = max({val[v], abs(mna[v] - lazy_mnb[v]), abs(mna[v] - lazy_mxb[v]), abs(mxa[v] - lazy_mnb[v]), abs(mxa[v] - lazy_mxb[v])});
    }
    void push(int v)
    {
        if (lazy_mxb[v] == 0)
        {
            return ;
        }
        lazy_mxb[2 * v] = max(lazy_mxb[2 * v], lazy_mxb[v]);
        lazy_mnb[2 * v] = min(lazy_mnb[2 * v], lazy_mnb[v]);
        refine(2 * v);
        lazy_mxb[2 * v + 1] = max(lazy_mxb[2 * v + 1], lazy_mxb[v]);
        lazy_mnb[2 * v + 1] = min(lazy_mnb[2 * v + 1], lazy_mnb[v]);
        refine(2 * v + 1);
        lazy_mxb[v] = 0;
        lazy_mnb[v] = 1e9;
    }
    void upd_b(int v, int TreeL, int TreeR, int L, int R, int B)
    {
        if (L > R)
        {
            return ;
        }
        if (TreeL == L && TreeR == R)
        {
            lazy_mnb[v] = min(lazy_mnb[v], B);
            lazy_mxb[v] = max(lazy_mxb[v], B);
            refine(v);
            return ;
        }
        push(v);
        int mid = (TreeL + TreeR)/2;
        upd_b(v * 2, TreeL, mid, L, min(R, mid), B);
        upd_b(v * 2 + 1, mid + 1, TreeR, max(L, mid + 1), R, B);
        val[v] = max({val[v], val[2 * v], val[2 * v + 1]});
    }
    void upd_a(int v, int TreeL, int TreeR, int pos, int A)
    {
        if (TreeL == TreeR)
        {
            if (A == 0)
            {
                mxa[v] = 0;
                mna[v] = 1e9;
            }
            else
            {
                mxa[v] = mna[v] = A;
            }
            lazy_mxb[v] = 0;
            lazy_mnb[v] = 1e9;
            return ;
        }
        push(v);
        int mid = (TreeL + TreeR)/2;
        if (pos <= mid)
        {
            upd_a(v * 2, TreeL, mid, pos, A);
        }
        else
        {
            upd_a(v * 2 + 1, mid + 1, TreeR, pos, A);
        }
        mxa[v] = max(mxa[2 * v], mxa[2 * v + 1]);
        mna[v] = min(mna[2 * v], mna[2 * v + 1]);
        val[v] = max({val[v], val[2 * v], val[2 * v + 1]});
    }
    int get(int v, int TreeL, int TreeR, int L, int R)
    {
        if (L > R)
        {
            return -1;
        }
        if (TreeL == L && TreeR == R)
        {
            return val[v];
        }
        push(v);
        int mid = (TreeL + TreeR)/2;
        return max(get(v * 2, TreeL, mid, L, min(R, mid)), get(v * 2 + 1, mid + 1, TreeR, max(L, mid + 1), R));
    }
} tree;
void solve()
{
    for (int r = 1; r <= n; ++ r)
    {
        for (int i : add[r])
        {
            tree.upd_a(1, 1, n, i, h[i]);
        }
        int L = max(1, r - b[r]), R = r - a[r];
        tree.upd_b(1, 1, n, L, R, h[r]);
        for (auto [l, i] : query[r])
        {
            res[i] = tree.get(1, 1, n, l, r);
        }
        for (int i : del[r])
        {
            tree.upd_a(1, 1, n, i, 0);
        }
    }
    for (int i = 1; i <= q; ++ i)
    {
        cout << res[i] << '\n';
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(TASK".INP", "r"))
    {
        freopen(TASK".INP", "r", stdin);
        //freopen(TASK".OUT", "w", stdout);
    }
    int t = 1;
    bool typetest = false;
    if (typetest)
    {
        cin >> t;
    }
    for (int __ = 1; __ <= t; ++ __)
    {
        //cout << "Case " << __ << ": ";
        read();
        solve();
    }
}

Compilation message (stderr)

antennas.cpp: In function 'int main()':
antennas.cpp:161:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  161 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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