Submission #1229545

#	Time	Username	Problem	Language	Result	Execution time	Memory
1229545		chikien2009	Global Warming (CEOI18_glo)	C++20	62 / 100	139 ms	8264 KiB

glo

#include <bits/stdc++.h>

using namespace std;

void setup()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

struct SEGMENT_TREE
{
    int tree[800000];
    
    inline void Clear()
    {
        fill_n(tree, 8e5, 0);
    }
    inline void Set(int ind, int l, int r, int x, int v)
    {
        if (r < x || x < l)
        {
            return;
        }
        if (l == r)
        {
            tree[ind] = max(tree[ind], v);
            return;
        }
        int m = (l + r) >> 1;
        Set(ind << 1, l, m, x, v);
        Set(ind << 1 | 1, m + 1, r, x, v);
        tree[ind] = max(tree[ind << 1], tree[ind << 1 | 1]);
    }
    inline int GetVal(int ind, int l, int r, int x, int y)
    {
        if (r < x || y < l || y < x)
        {
            return 0;
        }
        if (x <= l && r <= y)
        {
            return tree[ind];
        }
        int m = (l + r) >> 1;
        return max(GetVal(ind << 1, l, m, x, y), GetVal(ind << 1 | 1, m + 1, r, x, y));
    }
    inline int GetMin(int ind, int l, int r, int v)
    {
        if (l == r)
        {
            return l;
        }
        int m = (l + r) >> 1;
        if (tree[ind << 1] == v)
        {
            return GetMin(ind << 1, l, m, v);
        }
        return GetMin(ind << 1 | 1, m + 1, r, v);
    }
    inline int GetMax(int ind, int l, int r, int v)
    {
        if (l == r)
        {
            return l;
        }
        int m = (l + r) >> 1;
        if (tree[ind << 1 | 1] == v)
        {
            return GetMin(ind << 1 | 1, m + 1, r, v);
        }
        return GetMax(ind << 1, l, m, v);
    }
} st;

int n, m, x, a[200002], b[200002], res;
pair<int, int> pre[200002], suf[200002];

int main()
{
    setup();

    cin >> n >> x;
    for (int i = 1; i <= n; ++i)
    {
        cin >> a[i];
        b[i - 1] = a[i];
    }
    sort(b, b + n);
    m = unique(b, b + n) - b;
    for (int i = 1; i <= n; ++i)
    {
        a[i] = lower_bound(b, b + m, a[i]) - b + 1;
    }
    for (int i = 1; i <= n; ++i)
    {
        pre[i].first = st.GetVal(1, 1, 2e5, 1, a[i] - 1) + 1;
        st.Set(1, 1, 2e5, a[i], pre[i].first);
        pre[i].first = max(pre[i - 1].first, pre[i].first);
        pre[i].second = st.GetMin(1, 1, 2e5, pre[i].first);
    }
    res = pre[n].first;
    st.Clear();
    for (int i = n; i >= 1; --i)
    {
        suf[i].first = st.GetVal(1, 1, 2e5, a[i] + 1, 2e5) + 1;
        st.Set(1, 1, 2e5, a[i], suf[i].first);
        suf[i].first = max(suf[i + 1].first, suf[i].first);
        suf[i].second = st.GetMax(1, 1, 2e5, suf[i].first);
    }
    for (int i = 2; i <= n; ++i)
    {
        if (b[pre[i - 1].second - 1] - x < b[suf[i].second - 1])
        {
            res = max(res, pre[i - 1].first + suf[i].first);
        }
    }
    cout << res;
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 0 / 25