Submission #666179

#	Time	Username	Problem	Language	Result	Execution time	Memory
666179		urosk	The short shank; Redemption (BOI21_prison)	C++14	0 / 100	106 ms	79948 KiB

prison

#define here cerr<<"===========================================\n"
#define dbg(x) cerr<<#x<<": "<<x<<endl;
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#define ld double
#define ll long long
#define llinf 100000000000000000LL // 10^17
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) (ll)(a.size())
#define all(a) a.begin(),a.end()
#define ceri(a,l,r) {cerr<<#a<<": ";for(ll i_ = l;i_<=r;i_++) cerr<<a[i_]<< " ";cerr<<endl;}
#define cer(a) {cerr<<#a<<": ";for(ll x_ : a) cerr<<x_<< " ";cerr<<endl;}

#define daj_mi_malo_vremena ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);

using namespace std;
using namespace __gnu_pbds;
#define maxn 2000005
ll n,d,t,ans;
ll a[maxn],p[maxn],b[maxn];
vector<ll> g[maxn];
bool vis[maxn],bio[maxn];
ll dub[maxn],maxi[maxn];
ll dfs(ll u){
    ll x = u;
    vis[u] = 1;
    for(ll s : g[u]){
        if(vis[s]) continue;
        dub[s] = dub[u] + 1;
        ll y = dfs(s);
        if(dub[y]>dub[x]) x = y;
    }
    return maxi[u] = x;
}
bool cmp(ll x,ll y){
    return dub[x]>dub[y];
}
ll c[maxn];
void tc(){
    cin >> n >> d >> t;
    for(ll i = 1;i<=n;i++) cin >> a[i];
    stack<ll> s;
    ll rmax = 0,r = 0;
    for(ll i = 1;i<=n;i++){
        if(a[i]>t){
            b[i] = rmax;
            rmax = 0;
            while(sz(s)&&b[i]<i){
                p[s.top()] = i;
                b[i] = max(b[i],b[s.top()]);
                s.pop();
            }
            s.push(i);
        }else rmax = max(rmax,i+t-a[i]);
        c[i] = r;
        r = max(r,rmax);
    }
    while(sz(s)){
        if(c[s.top()]>=s.top()) p[s.top()] = s.top();
        s.pop();
    }
    for(ll i = 1;i<=n;i++) if(a[i]>t) g[p[i]].pb(i);
    priority_queue<pll> pq;
    for(ll i = n;i>=1;i--){
        if(a[i]<=t) continue;
        if(vis[i]) continue;
        dub[i] = 1;
        ll x = dfs(i);
        pq.push({dub[x],x});
    }
    ans = n;
    while(sz(pq)&&d){
        ll u = pq.top().sc;
        ll dept = pq.top().fi;
        ans-=dept;
        pq.pop();
        while(1){
            bio[u] = 1;
            for(ll s : g[u]){
                if(!bio[s]) pq.push({dub[maxi[s]]-dub[u],maxi[s]});
            }
            if(bio[p[u]]) break;
            if(u==p[u]) break;
            u = p[u];
        }
        d--;
    }
    cout<<ans<<endl;
}
int main(){
	daj_mi_malo_vremena
    int t; t = 1;
    while(t--){
        tc();
    }
	return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 10
• Subtask 5: 0 / 25
• Subtask 6: 0 / 20