Submission #529181

#	Time	Username	Problem	Language	Result	Execution time	Memory
529181		BeanZ	Financial Report (JOI21_financial)	C++14	100 / 100	573 ms	37460 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
//#define endl '\n'
const int N = 5e5 + 5;
long long mod = 998244353;
const int lim = 4e5 + 5;
const int lg = 19;
const int base = 311;
const long double eps = 1e-6;
ll st[N * 4], dp[N], p[N], mn[N];
pair<ll, ll> a[N];
void upd(ll k, ll l, ll r, ll x, ll v){
    if (x > r || x < l) return;
    if (l == r){
        st[k] = v;
        return;
    }
    ll mid = (l + r) >> 1;
    upd(k << 1, l, mid, x, v);
    upd(k << 1 | 1, mid + 1, r, x, v);
    st[k] = max(st[k << 1], st[k << 1 | 1]);
}
ll get(ll k, ll l, ll r, ll x, ll y){
    if (x > r || y < l) return 0;
    if (x <= l && y >= r) return st[k];
    ll mid = (l + r) >> 1;
    return max(get(k << 1, l, mid, x, y), get(k << 1 | 1, mid + 1, r, x, y));
}
ll find_set(ll u){
    if (p[u] < 0) return u;
    return p[u] = find_set(p[u]);
}
void dsu(ll u, ll v){
    u = find_set(u);
    v = find_set(v);
    if (u == v) return;
    if (p[u] > p[v]) swap(u, v);
    p[u] += p[v];
    p[v] = u;
    mn[u] = min(mn[u], mn[v]);
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    if (fopen("tests.inp", "r")){
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    ll n, d;
    cin >> n >> d;
    for (int i = 1; i <= n; i++){
        cin >> a[i].first;
        a[i].second = i;
        mn[i] = i;
        p[i] = -1;
    }
    sort(a + 1, a + n + 1);
    set<ll> s;
    ll ans = 1;
    for (int i = 1; i <= n; i++){
        ll r = i;
        while (r <= n && a[r].first == a[i].first){
            auto it = s.lower_bound(a[r].second);
            if (it != s.begin()){
                it--;
                if ((a[r].second - (*it)) <= d){
                    dp[a[r].second] = get(1, 1, n, mn[find_set(*it)], a[r].second) + 1;
                } else {
                    dp[a[r].second] = 1;
                }
            } else {
                dp[a[r].second] = 1;
            }
            ans = max(ans, dp[a[r].second]);
            r++;
        }
        for (int j = i; j < r; j++){
            upd(1, 1, n, a[j].second, dp[a[j].second]);
            auto it = s.lower_bound(a[j].second);
            if (it != s.begin()){
                it--;
                if ((a[j].second - (*it)) <= d){
                    dsu(*it, a[j].second);
                }
                it++;
            }
            if (it != s.end()){
                if (((*it) - a[j].second) <= d){
                    dsu(*it, a[j].second);
                }
            }
            s.insert(a[j].second);
        }
        i = r - 1;
    }
    /*for (int i = 1; i <= n; i++){
        cout << dp[i] << " ";
    }*/
    cout << ans;
}
/*
Ans:

Out:
*/

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:49:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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