Submission #590053

#	Time	Username	Problem	Language	Result	Execution time	Memory
590053		Tien_Noob	Triple Jump (JOI19_jumps)	C++17	100 / 100	854 ms	59760 KiB

jumps

//Make CSP great again
//Vengeance
#include <bits/stdc++.h>
#define TASK "TESTCODE"
#define Log2(x) 31 - __builtin_clz(x)
using namespace std;
const int N = 5e5;
int a[N + 1], res[N + 1], n, q;
vector<pair<int, int> > query[N + 1];
struct SegmentTree
{
    int add[4 * N + 1], mx[4 * N + 1], lazy[4 * N + 1];
    void buildtree(int v, int TreeL, int TreeR)
    {
        add[v] = lazy[v] = 0;
        if (TreeL == TreeR)
        {
            mx[v] = a[TreeL];
            return ;
        }
        int mid = (TreeL + TreeR)/2;
        buildtree(v * 2, TreeL, mid);
        buildtree(v * 2 + 1, mid + 1, TreeR);
        mx[v] = max(mx[2 * v], mx[2 * v + 1]);
    }
    void down(int v)
    {
        add[2 * v] = max(add[2 * v], lazy[v] + mx[2 * v]);
        add[2 * v + 1] = max(add[2 * v + 1], lazy[v] + mx[2 * v + 1]);

        lazy[2 * v] = max(lazy[2 * v], lazy[v]);
        lazy[2 * v + 1] = max(lazy[2 * v + 1], lazy[v]);
    }
    void upd(int v, int TreeL, int TreeR, int L, int R, int val)
    {
        //cerr << v << '\n';
        if (L > R)
        {
            return ;
        }
        if (TreeL == L && TreeR == R)
        {
            lazy[v] = max(lazy[v], val);
            add[v] = max(add[v], lazy[v] + mx[v]);
            return ;
        }
        int mid = (TreeL + TreeR)/2;
        down(v);
        upd(v * 2, TreeL, mid, L, min(R, mid), val);
        upd(v * 2 + 1, mid + 1, TreeR, max(L, mid + 1), R, val);
        add[v] = max(add[2 * v], add[2 * v + 1]);
    }
    int get(int v, int TreeL, int TreeR, int L, int R)
    {
        if (L > R)
        {
            return 0;
        }
        if (TreeL == L && TreeR == R)
        {
            return max(add[v], lazy[v] + mx[v]);
        }
        down(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 read()
{
    cin >> n;
    for (int i = 1; i <= n; ++ i)
    {
        cin >> a[i];
    }
    cin >> q;
    for (int i = 1; i <= q; ++ i)
    {
        int l, r;
        cin >> l >> r;
        query[l].emplace_back(r, i);
    }
    tree.buildtree(1, 1, n);
}
void solve()
{
    stack<int> st;
    for (int l = n; l >= 1; -- l)
    {
        while(!st.empty() && a[l] >= a[st.top()])
        {
            tree.upd(1, 1, n, 2 * st.top() - l, n, a[l] + a[st.top()]);
            //cerr << l << ' ' << st.top() << '\n';
            st.pop();
        }
        if (!st.empty())
        {
            //cerr << l << ' ' << st.top() << '\n';
            tree.upd(1, 1, n, 2 * st.top() - l, n, a[l] + a[st.top()]);
        }
        st.push(l);
        for (auto &[r, i] : query[l])
        {
            res[i] = tree.get(1, 1, n, l, r);
        }
    }
    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)

jumps.cpp: In function 'int main()':
jumps.cpp:117:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  117 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 27 / 27
• Subtask 4: 54 / 54