Submission #838636

#	Time	Username	Problem	Language	Result	Execution time	Memory
838636		winter0101	The short shank; Redemption (BOI21_prison)	C++17	80 / 100	2083 ms	470996 KiB

prison

#include<iostream>
#include<vector>
#include<stack>
using namespace std;
#define all(fl) fl.begin(),fl.end()
#define pb push_back
#define fi first
#define se second
#define for1(i,j,k) for(int i=j;i<=k;i++)
#define for2(i,j,k) for(int i=j;i>=k;i--)
#define for3(i,j,k,l) for(int i=j;i<=k;i+=l)
#define lb lower_bound
#define ub upper_bound
#define sz(a) (int)a.size()
#define pii pair<int,int>
#define pli pair<long long,int>
#define gcd __gcd
#define lcm(x,y) x*y/__gcd(x,y)
const int maxn=2e6+9;
const int inf=1e9+7;
int a[maxn];
int n,d,t1;
int st[maxn*4];
int lazy[maxn*4];
int p[maxn*4];
void push(int id){
if (lazy[id]){
    st[id*2]+=lazy[id];
    st[id*2+1]+=lazy[id];
    lazy[id*2]+=lazy[id];
    lazy[id*2+1]+=lazy[id];
    lazy[id]=0;
}
}
void combine(int id){
st[id]=max(st[id*2],st[id*2+1]);
if (st[id*2]>st[id*2+1]){
    p[id]=p[id*2];
}
else p[id]=p[id*2+1];
}
void build(int id,int l,int r){
p[id]=l;
st[id]=0;
if (l==r)return;
int mid=(l+r)/2;
build(id*2,l,mid);
build(id*2+1,mid+1,r);
}
void range_update(int id,int l,int r,int u,int v,int val){
if (l>v||r<u||u>v)return;
if (u<=l&&r<=v){
    st[id]+=val;
    lazy[id]+=val;
    return;
}
int mid=(l+r)/2;
push(id);
range_update(id*2,l,mid,u,v,val);
range_update(id*2+1,mid+1,r,u,v,val);
combine(id);
}
struct line{
int l,r;
bool operator < (const line &p1)const {
if (l==p1.l)return r<p1.r;
return l<p1.l;
}
};
bool vis[maxn];
vector<int> save[maxn*4];
vector<line>t;
void addline(int id,int l,int r,int u,int v,int dd){
if (l>v||r<u||u>v)return ;
if (u<=l&&r<=v){
    save[id].pb(dd);
    return;
}
int mid=(l+r)/2;
addline(id*2,l,mid,u,v,dd);
addline(id*2+1,mid+1,r,u,v,dd);
}
//vector<int>xoaxoa;
void xoa(int id,int l,int r,int u){
if (l>u||r<u)return;
//cout<<id<<" "<<l<<" "<<r<<" "<<u<<'\n';
for (auto v:save[id]){
    //cerr<<v<<'\n';
    //cerr<<t[v].l<<" "<<t[v].r<<'\n';
    if (!vis[v]){
    range_update(1,1,n-1,t[v].l,t[v].r,-1);
    //xoaxoa.pb(v);
    vis[v]=1;
    }
}
vector<int>().swap(save[id]);
if (l==r)return;
int mid=(l+r)/2;
if (mid>=u)xoa(id*2,l,mid,u);
else xoa(id*2+1,mid+1,r,u);
}
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    //freopen("temp.INP","r",stdin);
    //freopen("temp.OUT","w",stdout);
    cin>>n>>d>>t1;
    for1(i,1,n)cin>>a[i];
    stack<int>hjhj;
    int prison=0;
    for1(i,1,n){
    a[i]-=i;
    int val=a[i];
    int need=t1-i;
    while (!hjhj.empty()&&a[hjhj.top()]>=a[i])hjhj.pop();
    if (val<=need){
    hjhj.push(i);
    prison++;
    continue;
    }
    while (!hjhj.empty()&&a[hjhj.top()]>need)hjhj.pop();
    int pos=-1;
    if (!hjhj.empty())pos=hjhj.top();
    if (pos==-1)continue;
    prison++;
    t.pb({pos,i-1});
    }
    build(1,1,n-1);
    for1(i,0,sz(t)-1)
    {
    auto v=t[i];
    range_update(1,1,n-1,v.l,v.r,1);
    addline(1,1,n-1,v.l,v.r,i);
    }
    for1(i,1,d){
    if (st[1]==0)break;
    prison-=st[1];
    int pos=p[1];
    xoa(1,1,n-1,pos);
    }
    cout<<prison;
}

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