Submission #421099

#	Time	Username	Problem	Language	Result	Execution time	Memory
421099		Mamedov	Financial Report (JOI21_financial)	C++17	48 / 100	4050 ms	5008 KiB

Main

#include <bits/stdc++.h>
#define pii pair<int, int>
#define piii pair<int, pii>
#define pb push_back
#define ll long long
#define pll pair<ll, ll>
#define ui unsigned int
#define ull unsigned long long
#define f first
#define s second
#define oo 1000000000

using namespace std;


const int up = 3e5 + 5;
int tree[up << 2];

void update(int node, int l, int r, int pos, int val) {
    if(l == r) {
        tree[node] = val;
    }else {
        int mid = (l + r) >> 1;
        if(pos <= mid) {
            update(node << 1, l, mid, pos, val);
        }else {
            update((node << 1) | 1, mid + 1, r, pos, val);
        }
        tree[node] = max(tree[node << 1], tree[(node << 1) | 1]);
    }
}

int Max(int node, int l, int r, int ql, int qr) {
    if(ql > qr || l > qr || ql > r) return 0;
    if(ql <= l && r <= qr) {
        return tree[node];
    }else {
        int mid = (l + r) >> 1;
        return max(Max(node << 1, l, mid, ql, qr), Max((node << 1) | 1, mid + 1, r, ql, qr));
    }
}

bool cmp(pii p1, pii p2) {
    if(p1.f == p2.f) return p1.s > p2.s;
    else return p1.f < p2.f;
}
void solve() {
    int n, d;
    cin >> n >> d;
    vector<pii>a(n);
    vector<int>dp(n, 1);
    for(int i = 0; i < n; ++i) {
        cin >> a[i].f;
        a[i].s = i;
    }
    vector<int>to_left(n);
    to_left[0] = 0;
    for(int i = 1; i < n; ++i) {
        to_left[i] = max(0, i - d);
        for(int j = i - 1; j >= to_left[i]; --j) {
            if(a[j] <= a[i]) {
                to_left[i] = max(0, j - d);
            }
        }
    }
    sort(a.begin(), a.end(), cmp);
    int res = 0;
    for(int i = 0; i < n; ++i) {
        int idx = a[i].s;
        dp[idx] = Max(1, 0, n - 1, to_left[idx], idx - 1) + 1;
        update(1, 0, n - 1, idx, dp[idx]);
        //cout << "for " << idx << " " << dp[idx] << '\n';
        res = max(res, dp[idx]);
    }
    cout << res << '\n';
}
int main() {
    ios_base::sync_with_stdio(false);
    solve();
    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 20 / 20
• Subtask 4: 0 / 12
• Subtask 5: 0 / 5
• Subtask 6: 0 / 35