Submission #1229116

#	Time	Username	Problem	Language	Result	Execution time	Memory
1229116		adad	Rabbit Carrot (LMIO19_triusis)	C++20	0 / 100	3 ms	328 KiB

triusis

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

const int MAX = 2e5 + 5;

int seg[4 * MAX];

void update(int id, int l, int r, int pos, int val) {
    if (l == r) {
        seg[id] = max(seg[id], val);
        return;
    }
    int mid = (l + r) / 2;
    if (pos <= mid)
        update(id * 2, l, mid, pos, val);
    else
        update(id * 2 + 1, mid + 1, r, pos, val);
    seg[id] = max(seg[id * 2], seg[id * 2 + 1]);
}

int get(int id, int l, int r, int u, int v) {
    if (v < l || r < u) return 0;
    if (u <= l && r <= v) return seg[id];
    int mid = (l + r) / 2;
    return max(get(id * 2, l, mid, u, v), get(id * 2 + 1, mid + 1, r, u, v));
}

int main() {
    int n, m;
    cin >> n >> m;
    vector<int> a(n + 1), all;

    a[0] = 0;
    all.push_back(0);
    for (int i = 1; i <= n; ++i) {
        cin >> a[i];
        all.push_back(a[i]);
    }

    // compress height
    sort(all.begin(), all.end());
    all.erase(unique(all.begin(), all.end()), all.end());
    auto get_index = [&](int x) {
        return lower_bound(all.begin(), all.end(), x) - all.begin();
    };

    int sz = all.size();
    vector<int> dp(n + 1);
    update(1, 0, sz - 1, get_index(0), 0); // dp[0] = 0 at height 0

    for (int i = 1; i <= n; ++i) {
        int max_jump_from = a[i] - m;
        int l = lower_bound(all.begin(), all.end(), max_jump_from) - all.begin();
        int r = sz - 1;
        dp[i] = get(1, 0, sz - 1, l, r) + 1;
        update(1, 0, sz - 1, get_index(a[i]), dp[i]);
    }

    int max_dp = *max_element(dp.begin(), dp.end());
    cout << n - max_dp << '\n';
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 28
• Subtask 4: 0 / 37