Submission #696842

#	Time	Username	Problem	Language	Result	Execution time	Memory
696842		tamthegod	Financial Report (JOI21_financial)	C++17	60 / 100	4053 ms	563216 KiB

Main

// Make the best become better
// No room liftor laziness
#include<bits/stdc++.h>

#define int long long
#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 = 1e6 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e18;
int n, d;
int a[maxN];
int t[maxN];
int f[maxN];
int lg[maxN], lift[21][maxN];
int lab[maxN];
vector<int> vc[maxN];
int dp[maxN];
multiset<int> st[4 * maxN];
int mark[maxN];
vector<int> close[maxN];
void build(int id, int l, int r)
{
    if(l == r)
    {
        mark[l] = id;
        return;
    }
    int mid = (l + r) / 2;
    build(id * 2, l, mid);
    build(id * 2 + 1, mid + 1, r);
}
void add(int pos, int val)
{
    int id = mark[pos];
    while(id)
    {
        st[id].insert(val);
        id /= 2;
    }
}
void del(int pos, int val)
{
    int id = mark[pos];
    while(id)
    {
        st[id].erase(st[id].find(val));
        id /= 2;
    }
}
int get(int id, int l, int r, int u, int v)
{
    if(l > v || r < u) return 0;
    if(l >= u && r <= v)
    {
        auto it = st[id].end();
        if(it == st[id].begin()) return 0;
        return *--it;
    }
    int mid = (l + r) / 2;
    return max(get(id * 2, l, mid, u, v), get(id * 2 + 1, mid + 1, r, u, v));
}
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 Log()
{
    for(int i=2; i<maxN; i++)
        lg[i] = lg[i / 2] + 1;
}
void SparseTable()
{
    for(int i=1; i<=n; i++) lift[0][i] = a[i];
    for(int k=1; k<=lg[n]; k++)
    {
        for(int i=1; i<=n; i++)
        {
            int j = i + (1 << (k - 1));
            if(j > n) lift[k][i] = lift[k - 1][i];
            else lift[k][i] = min(lift[k - 1][i], lift[k - 1][j]);
        }
    }
}
int get(int l, int r)
{
    int j = r - l + 1;
    int k = lg[j];
    return min(lift[k][l], lift[k][r - (1 << k) + 1]);
}
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);
        }
    }
    build(1, 1, n);
    for(int i=1; i<=n; i++)
        close[t[i]].pb(i);
    for(int i=1; i<=n; i++)
    {
        f[i] = get(1, 1, n, 1, a[i] - 1) + 1;
        add(a[i], f[i]);
        for(int v : close[i])
            del(a[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);
    Log();
    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: 0 / 5
• Subtask 6: 0 / 35