Submission #838591

#	Time	Username	Problem	Language	Result	Execution time	Memory
838591		winter0101	The short shank; Redemption (BOI21_prison)	C++17	0 / 100	341 ms	28488 KiB

prison

#include<bits/stdc++.h>
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 update(int id,int l,int r,int u,int val){
if (l>u||r<u)return;
if (l==r){
    st[id]=val;
    p[id]=l;
    return;
}
int mid=(l+r)/2;
update(id*2,l,mid,u,val);
update(id*2+1,mid+1,r,u,val);
st[id]=min(st[id*2],st[id*2+1]);
}
int walk(int id,int l,int r,int val){
if (st[id]>val)return -1;
if (l==r)return l;
int mid=(l+r)/2;
if (st[id*2+1]<=val)return walk(id*2+1,mid+1,r,val);
return walk(id*2,l,mid,val);
}
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 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,v;
bool operator < (const line &p1)const {
return l<p1.l;
}
};
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    //freopen("temp.INP","r",stdin);
    //freopen(".OUT","w",stdout);
    cin>>n>>d>>t1;
    for1(i,1,n)cin>>a[i];
    for1(i,1,n)update(1,1,n,i,inf);
    int prison=0;
    vector<line>t;
    for1(i,1,n){
    int val=a[i]-i;
    int need=t1-i;
    if (val<=need){
    update(1,1,n,i,val);
    prison++;
    continue;
    }
    int pos=walk(1,1,n,need);
    update(1,1,n,i,val);
    if (pos==-1)continue;
    prison++;
    if (t.empty()){
        t.pb({pos,i-1,1});
    }
    else {
        line tmp={pos,i-1,1};
        while (!t.empty()&&t.back().l>=pos){
            tmp.v+=t.back().v;
            t.pop_back();
        }
        t.pb(tmp);
    }
    }
    for1(i,1,n)update(1,1,n-1,i,0);
    multiset<line>t2;
    for (auto v:t)
    {
    t2.insert(v);
    range_update(1,1,n-1,v.l,v.r,v.v);
    }
    vector<line>().swap(t);
    for1(i,1,d){
    if (t2.empty())break;
    prison-=st[1];
    int pos=p[1];
    line tmp={pos,n+1,n+1};
    auto it=t2.upper_bound(tmp);
    if (it==t2.begin())break;
    it--;
    vector<line>needtoerase;
    for(;;it--){
        if (it==t2.begin())break;
        auto tp=(*it);
        if (tp.l<=pos&&tp.r>=pos){
            needtoerase.pb(tp);
            range_update(1,1,n-1,tp.l,tp.r,-tp.v);
        }
        else break;
    }
    for (auto v:needtoerase)t2.erase(v);
    }
    cout<<prison;
}

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