Submission #696860

#	Time	Username	Problem	Language	Result	Execution time	Memory
696860		tamthegod	Financial Report (JOI21_financial)	C++17	100 / 100	702 ms	45204 KiB

Main

// Make the best become better
// No room liftor laziness
#include<bits/stdc++.h>
#define pb push_back
#define lifti liftirst
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 3e5 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e9;
int n, d;
int a[maxN];
int t[maxN];
int f[maxN];
int lab[maxN];
vector<int> vc[maxN];
int dp[maxN];
int st[4 * maxN], lazy[4 * maxN];
void down(int id)
{
    int t = lazy[id];
    st[id * 2] = max(st[id * 2], t);
    st[id * 2 + 1] = max(st[id * 2 + 1], t);
    lazy[id * 2] = max(lazy[id * 2], t);
    lazy[id * 2 + 1] = max(lazy[id * 2 + 1], t);
}
void update(int id, int l, int r, int u, int v, int val)
{
    if(l > v || r < u) return;
    if(l >= u && r <= v)
    {
        st[id] = max(st[id], val);
        lazy[id] = max(lazy[id], val);
        return;
    }
    down(id);
    int mid = (l + r) / 2;
    update(id * 2, l, mid, u, v, val);
    update(id * 2 + 1, mid + 1, r, u, v, val);
}
int get(int id, int l, int r, int pos)
{
    if(l == r) return st[id];
    int mid = (l + r) / 2;
    down(id);
    if(pos <= mid) return get(id * 2, l, mid, pos);
    return get(id * 2 + 1, mid + 1, r, pos);
}
int Findset(int u)
{
    return lab[u] < 0 ? u : lab[u] = Findset(lab[u]);
}
void Unite(int u, int v)
{
    int r = Findset(u), s = Findset(v);
    if(r == s) return;
    if(lab[r] > lab[s]) swap(r, s);
    dp[r] = max(dp[r], dp[s]);
    lab[r] += lab[s];
    lab[s] = r;
}
void ReadInput()
{
    vector<int> vc;
    cin >> n >> d;
    for(int i=1; i<=n; i++)
    {
        cin >> a[i];
        vc.pb(a[i]);
    }
    sort(vc.begin(), vc.end());
    vc.erase(unique(vc.begin(), vc.end()), vc.end());
    for(int i=1; i<=n; i++)
        a[i] = upper_bound(vc.begin(), vc.end(), a[i]) - vc.begin();
}
void Solve()
{
    memset(lab, -1, sizeof lab);
    for(int i=1; i<=n; i++)
        vc[a[i]].pb(i);
    for(int i=1; i<=n; i++)
        dp[i] = i;
    set<int> S;
    for(int val=1; val<=n; val++)
    {
        for(int v : vc[val])
        {
            auto it = S.lower_bound(v - d);
            if(it != S.end() && abs(v - *it) <= d) Unite(*it, v);
            it = S.upper_bound(v + d);
            if(it != S.begin())
            {
                it--;
                if(abs(v - *it) <= d) Unite(*it, v);
            }
            S.insert(v);
        }
        for(int v : vc[val])
        {
            t[v] = min(n, dp[Findset(v)] + d);
        }
    }
    for(int val=1; val<=n; val++)
    {
        for(int v : vc[val])
            f[v] = get(1, 1, n, v) + 1;
        for(int v : vc[val])
        {
            update(1, 1, n, v + 1, t[v], f[v]);
        }
    }
    cout << *max_element(f + 1, f + n + 1);
}
int32_t main()
{
   // freopen("sol.inp", "r", stdin);
   // freopen("sol.out", "w", stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ReadInput();
    Solve();
}
// 2 3 8 5 8 7 8 10 10 10

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